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href="https://www.academia.edu/88404057/Determining_the_Heat_of_Fusion_and_Specific_Heat_of_Microencapsulated_Phase_Change_Material_Slurry_by_Thermal_Delay_Method"><img alt="Research paper thumbnail of Determining the Heat of Fusion and Specific Heat of Microencapsulated Phase Change Material Slurry by Thermal Delay Method" class="work-thumbnail" src="https://attachments.academia-assets.com/92381941/thumbnails/1.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" href="https://www.academia.edu/88404057/Determining_the_Heat_of_Fusion_and_Specific_Heat_of_Microencapsulated_Phase_Change_Material_Slurry_by_Thermal_Delay_Method">Determining the Heat of Fusion and Specific Heat of Microencapsulated Phase Change Material Slurry by Thermal Delay Method</a></div><div class="wp-workCard_item"><span>Energies</span></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">This paper details an experimental study that was performed to investigate the specific heat of m...</span><a class="js-work-more-abstract" data-broccoli-component="work_strip.more_abstract" data-click-track="profile-work-strip-more-abstract" href="javascript:;"><span> more </span><span><i class="fa fa-caret-down"></i></span></a><span class="js-work-more-abstract-untruncated hidden">This paper details an experimental study that was performed to investigate the specific heat of microencapsulated phase change material (mPCM) slurry and its heat of fusion at the PCM phase change transition temperature. Six samples (mPCM slurry concentrate with the water solution of propylene glycol used as a main base liquid) were prepared. As the concentrate contains 43.0% mPCM, the actual mass fraction amounts to 8.6, 12.9, 17.2, 21.5, 25.8, and 30.1 wt%, respectively. The thermal delay method was used. Samples were cooled from 50 °C to 10 °C. A higher concentration of microcapsules caused a proportional increase in the specific heat of slurry at the main peak melting temperature. The maximum value of the specific heat changed from 9.2 to 33.7 kJ/kg for 8.6 wt%, and 30.1 wt%, respectively. The specific heat of the mPCM slurry is a constant quantity and depends on the concentration of the microcapsules. The specific heat of the slurry (PCM inside microcapsules in a liquid form) d...</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="d3e0b853fe5dba330a71ba70eb68351c" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":92381941,"asset_id":88404057,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/92381941/download_file?st=MTczMjgyNzE5Miw4LjIyMi4yMDguMTQ2&s=profile"><span><i class="fa fa-arrow-down"></i></span><span>Download</span></a><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="88404057"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span><span id="work-strip-rankings-button-container"></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="88404057"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 88404057; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); $(".js-view-count[data-work-id=88404057]").text(description); $(".js-view-count[data-work-id=88404057]").attr('title', description).tooltip(); }); });</script></span></span><span><span class="percentile-widget hidden"><span class="u-mr2x work-percentile"></span></span><script>$(function () { var workId = 88404057; window.Academia.workPercentilesFetcher.queue(workId, function (percentileText) { var container = $(".js-work-strip[data-work-id='88404057']"); container.find('.work-percentile').text(percentileText.charAt(0).toUpperCase() + percentileText.slice(1)); container.find('.percentile-widget').show(); container.find('.percentile-widget').removeClass('hidden'); }); });</script></span><span><script>$(function() { new Works.PaperRankView({ workId: 88404057, container: "", }); });</script></span></div><div id="work-strip-premium-row-container"></div></div></div><script> require.config({ waitSeconds: 90 })(["https://a.academia-assets.com/assets/wow_profile-f77ea15d77ce96025a6048a514272ad8becbad23c641fc2b3bd6e24ca6ff1932.js","https://a.academia-assets.com/assets/work_edit-ad038b8c047c1a8d4fa01b402d530ff93c45fee2137a149a4a5398bc8ad67560.js"], function() { // from javascript_helper.rb var dispatcherData = {} if (true){ window.WowProfile.dispatcher = window.WowProfile.dispatcher || _.clone(Backbone.Events); dispatcherData = { dispatcher: window.WowProfile.dispatcher, downloadLinkId: "d3e0b853fe5dba330a71ba70eb68351c" } } $('.js-work-strip[data-work-id=88404057]').each(function() { if (!$(this).data('initialized')) { new WowProfile.WorkStripView({ el: this, workJSON: {"id":88404057,"title":"Determining the Heat of Fusion and Specific Heat of Microencapsulated Phase Change Material Slurry by Thermal Delay Method","translated_title":"","metadata":{"abstract":"This paper details an experimental study that was performed to investigate the specific heat of microencapsulated phase change material (mPCM) slurry and its heat of fusion at the PCM phase change transition temperature. 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Technologies. Materials.</span><span>, 2019</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="ed1357a5dc10b1d2001b9433d1cb091c" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":92381944,"asset_id":88404055,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/92381944/download_file?st=MTczMjgyNzE5Miw4LjIyMi4yMDguMTQ2&s=profile"><span><i class="fa fa-arrow-down"></i></span><span>Download</span></a><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="88404055"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span><span id="work-strip-rankings-button-container"></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="88404055"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 88404055; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); $(".js-view-count[data-work-id=88404055]").text(description); $(".js-view-count[data-work-id=88404055]").attr('title', description).tooltip(); }); });</script></span></span><span><span class="percentile-widget hidden"><span class="u-mr2x work-percentile"></span></span><script>$(function () { var workId = 88404055; window.Academia.workPercentilesFetcher.queue(workId, function (percentileText) { var container = $(".js-work-strip[data-work-id='88404055']"); container.find('.work-percentile').text(percentileText.charAt(0).toUpperCase() + percentileText.slice(1)); container.find('.percentile-widget').show(); container.find('.percentile-widget').removeClass('hidden'); }); });</script></span><span><script>$(function() { new Works.PaperRankView({ workId: 88404055, container: "", }); });</script></span></div><div id="work-strip-premium-row-container"></div></div></div><script> require.config({ waitSeconds: 90 })(["https://a.academia-assets.com/assets/wow_profile-f77ea15d77ce96025a6048a514272ad8becbad23c641fc2b3bd6e24ca6ff1932.js","https://a.academia-assets.com/assets/work_edit-ad038b8c047c1a8d4fa01b402d530ff93c45fee2137a149a4a5398bc8ad67560.js"], function() { // from javascript_helper.rb var dispatcherData = {} if (true){ window.WowProfile.dispatcher = window.WowProfile.dispatcher || _.clone(Backbone.Events); dispatcherData = { dispatcher: window.WowProfile.dispatcher, downloadLinkId: "ed1357a5dc10b1d2001b9433d1cb091c" } } $('.js-work-strip[data-work-id=88404055]').each(function() { if (!$(this).data('initialized')) { new WowProfile.WorkStripView({ el: this, workJSON: {"id":88404055,"title":"Determination of geyser events in a thermosyphon working with graphene oxide nanofluid","translated_title":"","metadata":{"publisher":"Scientific Technical Union of Mechanical Engineering *Industry 4.0*","grobid_abstract":"Two-phase closed thermosyphons are efficient passive devices with potential for using in many heat transfer applications. 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$(this).data('initialized', true); } }); $a.trackClickSource(".js-work-strip-work-link", "profile_work_strip") }); </script> <div class="js-work-strip profile--work_container" data-work-id="88404054"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" href="https://www.academia.edu/88404054/Controlling_vapor_quality_of_R245fa_in_a_microchannel_evaporator"><img alt="Research paper thumbnail of Controlling vapor quality of R245fa in a microchannel evaporator" class="work-thumbnail" src="https://a.academia-assets.com/images/blank-paper.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" href="https://www.academia.edu/88404054/Controlling_vapor_quality_of_R245fa_in_a_microchannel_evaporator">Controlling vapor quality of R245fa in a microchannel evaporator</a></div><div class="wp-workCard_item"><span>Proceedings of the 25<sup>th</sup> IIR International Congress of Refrigeration: Montréal , Canada, August 24-30, 2019.</span><span>, Aug 24, 2019</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="88404054"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span><span id="work-strip-rankings-button-container"></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="88404054"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 88404054; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); $(".js-view-count[data-work-id=88404054]").text(description); $(".js-view-count[data-work-id=88404054]").attr('title', description).tooltip(); }); });</script></span></span><span><span class="percentile-widget hidden"><span class="u-mr2x work-percentile"></span></span><script>$(function () { var workId = 88404054; window.Academia.workPercentilesFetcher.queue(workId, function (percentileText) { var container = $(".js-work-strip[data-work-id='88404054']"); container.find('.work-percentile').text(percentileText.charAt(0).toUpperCase() + percentileText.slice(1)); container.find('.percentile-widget').show(); container.find('.percentile-widget').removeClass('hidden'); }); });</script></span><span><script>$(function() { new Works.PaperRankView({ workId: 88404054, container: "", }); });</script></span></div><div id="work-strip-premium-row-container"></div></div></div><script> require.config({ waitSeconds: 90 })(["https://a.academia-assets.com/assets/wow_profile-f77ea15d77ce96025a6048a514272ad8becbad23c641fc2b3bd6e24ca6ff1932.js","https://a.academia-assets.com/assets/work_edit-ad038b8c047c1a8d4fa01b402d530ff93c45fee2137a149a4a5398bc8ad67560.js"], function() { // from javascript_helper.rb var dispatcherData = {} if (false){ window.WowProfile.dispatcher = window.WowProfile.dispatcher || _.clone(Backbone.Events); 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$(this).data('initialized', true); } }); $a.trackClickSource(".js-work-strip-work-link", "profile_work_strip") }); </script> <div class="js-work-strip profile--work_container" data-work-id="88404053"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" href="https://www.academia.edu/88404053/Performance_analysis_and_cycle_time_optimization_of_a_single_evaporator_three_bed_solid_sorption_refrigeration_system_driven_by_low_temperature_heat_source"><img alt="Research paper thumbnail of Performance analysis and cycle time optimization of a single evaporator three-bed solid-sorption refrigeration system driven by low-temperature heat source" class="work-thumbnail" src="https://a.academia-assets.com/images/blank-paper.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" href="https://www.academia.edu/88404053/Performance_analysis_and_cycle_time_optimization_of_a_single_evaporator_three_bed_solid_sorption_refrigeration_system_driven_by_low_temperature_heat_source">Performance analysis and cycle time optimization of a single evaporator three-bed solid-sorption refrigeration system driven by low-temperature heat source</a></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">This paper discusses performance analysis and cycle time optimization of a three-bed silica-gel/w...</span><a class="js-work-more-abstract" data-broccoli-component="work_strip.more_abstract" data-click-track="profile-work-strip-more-abstract" href="javascript:;"><span> more </span><span><i class="fa fa-caret-down"></i></span></a><span class="js-work-more-abstract-untruncated hidden">This paper discusses performance analysis and cycle time optimization of a three-bed silica-gel/water adsorption chiller. Presented study builds upon the fact that desorption phase requires noticeably less time than adsorption phase, i.e. desorption is 2.2-3.5 times faster than adsorption. The operating cycle was simulated using a numerical model. Lengths of adsorption/desorption phases and the offset time between individual adsorbers were varied for optimal performance. The results show that third bed increased cooling capacity of adsorption chiller. The optimal total cycle time that yields the highest cooling capacity is slightly shorter than in a two-bed setup. The difference is larger if the chiller is driven by lower temperature, 65°C instead of 85°C. The optimal ratio between the time of desorption and the time of adsorption in a three-bed system is f ~ 0.6, while it is f ~ 0.8 in a two-bed system. The optimal offset time is 1/3 of the total cycle time. The cycle time optimiza...</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="88404053"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span><span id="work-strip-rankings-button-container"></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="88404053"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 88404053; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); $(".js-view-count[data-work-id=88404053]").text(description); $(".js-view-count[data-work-id=88404053]").attr('title', description).tooltip(); }); });</script></span></span><span><span class="percentile-widget hidden"><span class="u-mr2x work-percentile"></span></span><script>$(function () { var workId = 88404053; window.Academia.workPercentilesFetcher.queue(workId, function (percentileText) { var container = $(".js-work-strip[data-work-id='88404053']"); container.find('.work-percentile').text(percentileText.charAt(0).toUpperCase() + percentileText.slice(1)); container.find('.percentile-widget').show(); container.find('.percentile-widget').removeClass('hidden'); }); });</script></span><span><script>$(function() { new Works.PaperRankView({ workId: 88404053, container: "", }); });</script></span></div><div id="work-strip-premium-row-container"></div></div></div><script> require.config({ waitSeconds: 90 })(["https://a.academia-assets.com/assets/wow_profile-f77ea15d77ce96025a6048a514272ad8becbad23c641fc2b3bd6e24ca6ff1932.js","https://a.academia-assets.com/assets/work_edit-ad038b8c047c1a8d4fa01b402d530ff93c45fee2137a149a4a5398bc8ad67560.js"], function() { // from javascript_helper.rb var dispatcherData = {} if (false){ window.WowProfile.dispatcher = window.WowProfile.dispatcher || _.clone(Backbone.Events); dispatcherData = { dispatcher: window.WowProfile.dispatcher, downloadLinkId: "-1" } } $('.js-work-strip[data-work-id=88404053]').each(function() { if (!$(this).data('initialized')) { new WowProfile.WorkStripView({ el: this, workJSON: {"id":88404053,"title":"Performance analysis and cycle time optimization of a single evaporator three-bed solid-sorption refrigeration system driven by low-temperature heat source","translated_title":"","metadata":{"abstract":"This paper discusses performance analysis and cycle time optimization of a three-bed silica-gel/water adsorption chiller. Presented study builds upon the fact that desorption phase requires noticeably less time than adsorption phase, i.e. desorption is 2.2-3.5 times faster than adsorption. The operating cycle was simulated using a numerical model. Lengths of adsorption/desorption phases and the offset time between individual adsorbers were varied for optimal performance. The results show that third bed increased cooling capacity of adsorption chiller. The optimal total cycle time that yields the highest cooling capacity is slightly shorter than in a two-bed setup. The difference is larger if the chiller is driven by lower temperature, 65°C instead of 85°C. The optimal ratio between the time of desorption and the time of adsorption in a three-bed system is f ~ 0.6, while it is f ~ 0.8 in a two-bed system. The optimal offset time is 1/3 of the total cycle time. 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The effect of the metastable flow region outlet refrigerant parameters and real working parameters of capillary tube is presented. Necessity of consideration of the metastable flow region in the new methods of calculation and selection of the capillary tubes is noticed.</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="88404051"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span><span id="work-strip-rankings-button-container"></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="88404051"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 88404051; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); $(".js-view-count[data-work-id=88404051]").text(description); $(".js-view-count[data-work-id=88404051]").attr('title', description).tooltip(); }); });</script></span></span><span><span class="percentile-widget hidden"><span class="u-mr2x work-percentile"></span></span><script>$(function () { var workId = 88404051; window.Academia.workPercentilesFetcher.queue(workId, function (percentileText) { var container = $(".js-work-strip[data-work-id='88404051']"); container.find('.work-percentile').text(percentileText.charAt(0).toUpperCase() + percentileText.slice(1)); container.find('.percentile-widget').show(); container.find('.percentile-widget').removeClass('hidden'); }); });</script></span><span><script>$(function() { new Works.PaperRankView({ workId: 88404051, container: "", }); });</script></span></div><div id="work-strip-premium-row-container"></div></div></div><script> require.config({ waitSeconds: 90 })(["https://a.academia-assets.com/assets/wow_profile-f77ea15d77ce96025a6048a514272ad8becbad23c641fc2b3bd6e24ca6ff1932.js","https://a.academia-assets.com/assets/work_edit-ad038b8c047c1a8d4fa01b402d530ff93c45fee2137a149a4a5398bc8ad67560.js"], function() { // from javascript_helper.rb var dispatcherData = {} if (false){ window.WowProfile.dispatcher = window.WowProfile.dispatcher || _.clone(Backbone.Events); dispatcherData = { dispatcher: window.WowProfile.dispatcher, downloadLinkId: "-1" } } $('.js-work-strip[data-work-id=88404051]').each(function() { if (!$(this).data('initialized')) { new WowProfile.WorkStripView({ el: this, workJSON: {"id":88404051,"title":"The mathematical model of zeotropic mixture refrigerants in metastable flow conditions","translated_title":"","metadata":{"abstract":"The paper shows the results of an theoretical analysis of the metastable flow phenomena during the two-phase refrigerant\u0026#39;s throttling process inside the capillary tube. 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The eq...</span><a class="js-work-more-abstract" data-broccoli-component="work_strip.more_abstract" data-click-track="profile-work-strip-more-abstract" href="javascript:;"><span> more </span><span><i class="fa fa-caret-down"></i></span></a><span class="js-work-more-abstract-untruncated hidden">This article contains thermodynamic analysis of solid sorption chemical heat pump systems. The equations proposed were used to design a device suitable for waste heat recovery. 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$(this).data('initialized', true); } }); $a.trackClickSource(".js-work-strip-work-link", "profile_work_strip") }); </script> <div class="js-work-strip profile--work_container" data-work-id="88404038"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" href="https://www.academia.edu/88404038/Subcooled_boiling_regime_map_for_water_at_low_saturation_temperature_and_subatmospheric_pressure"><img alt="Research paper thumbnail of Subcooled boiling regime map for water at low saturation temperature and subatmospheric pressure" class="work-thumbnail" src="https://attachments.academia-assets.com/92382005/thumbnails/1.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" href="https://www.academia.edu/88404038/Subcooled_boiling_regime_map_for_water_at_low_saturation_temperature_and_subatmospheric_pressure">Subcooled boiling regime map for water at low saturation temperature and subatmospheric pressure</a></div><div class="wp-workCard_item"><span>Experimental Thermal and Fluid Science</span><span>, 2020</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="5c188b42bf0c54942abdd9b1c765f1d2" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":92382005,"asset_id":88404038,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/92382005/download_file?st=MTczMjgyNzE5Miw4LjIyMi4yMDguMTQ2&s=profile"><span><i class="fa fa-arrow-down"></i></span><span>Download</span></a><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="88404038"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span><span id="work-strip-rankings-button-container"></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="88404038"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 88404038; 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At low vapor pressure, the static head of the liquid column induces a non-negligible pressure gradient. This results in a local pressure-induced subcooling that makes the case of boiling at low vapor pressure with a high level of liquid a particular case of subcooled boiling. The experiments were conducted for variety of working parameters: three vapor pressures (2.4 kPa, 3.1 kPa, 4.1 kPa), four levels of liquid (15 cm, 28 cm, 35 cm, 60 cm) and five applied heat fluxes (3.6 W • cm −2 , 4.4 W • cm −2 , 5.2 W • cm −2 , 6.1 W • cm −2 and 7.1 W • cm −2). Owing to a statistical analysis of the signal of a heat flux sensor coupled with high-speed video recording, four different boiling regimes were identified: the regime of convection or small popping bubbles, the regime of isolated bubbles, the regime of intermittent boiling and the regime of fully developed boiling. The small popping bubbles and the intermittent boiling regimes are specific to the low pressure boiling: they are governed by the phenomenon of condensation driven by the aforementioned static pressure induced subcooling. Finally, to provide a visual representation of the influence of the working parameters on the boiling behavior, a dimensionless boiling regime map was proposed. This type of representation is a tool to predict the boiling regimes from a set of operating conditions but it is also useful to interpret the physical phenomena involved and how they differ from those occurring at higher pressure. 1.1. Temperature-induced subcooled boiling Subcooled boiling was primarily studied in the case of temperatureinduced subcooling (liquid bulk temperature being lower than the","publication_date":{"day":null,"month":null,"year":2020,"errors":{}},"publication_name":"Experimental Thermal and Fluid Science","grobid_abstract_attachment_id":92382005},"translated_abstract":null,"internal_url":"https://www.academia.edu/88404038/Subcooled_boiling_regime_map_for_water_at_low_saturation_temperature_and_subatmospheric_pressure","translated_internal_url":"","created_at":"2022-10-13T05:03:30.057-07:00","preview_url":null,"current_user_can_edit":null,"current_user_is_owner":null,"owner_id":240164373,"coauthors_can_edit":true,"document_type":"paper","co_author_tags":[],"downloadable_attachments":[{"id":92382005,"title":"","file_type":"pdf","scribd_thumbnail_url":"https://attachments.academia-assets.com/92382005/thumbnails/1.jpg","file_name":"j.expthermflusci.2020.11015020221013-1-3qqdbi.pdf","download_url":"https://www.academia.edu/attachments/92382005/download_file?st=MTczMjgyNzE5Miw4LjIyMi4yMDguMTQ2&","bulk_download_file_name":"Subcooled_boiling_regime_map_for_water_a.pdf","bulk_download_url":"https://d1wqtxts1xzle7.cloudfront.net/92382005/j.expthermflusci.2020.11015020221013-1-3qqdbi-libre.pdf?1665662720=\u0026response-content-disposition=attachment%3B+filename%3DSubcooled_boiling_regime_map_for_water_a.pdf\u0026Expires=1732830792\u0026Signature=KlpkT-5Hvpe1qFcaLkSMOhAmLvHH5NRPHCNC9GenBIofgrN2~xZ-D1ym3bgRXWOT22e~KK0UlYNNOXrH6xm8z-3lrGaYsuQnXnf26K82LVbRUwOgqjrKvo-hmMcftcCfLPBIgbJbVc7TZ5LnYIbokqCSMW-Vpm3o7JSU0aHz2R-zl8gAT2PmOooSJSbT~Z5prnZJSTOM5k4V4Dola~PGBhOfK749NDTeUG0Pp15toEkVDfTnb7e2oPlKV2C-K7T2tXvEeK8rPPLz6iAmum94403Xn4pBC9qNYbYr7B8wBKUH6uetBvzRQTkHO5RpmPc1cV-Uk7PtH2kOYM8A5OVbow__\u0026Key-Pair-Id=APKAJLOHF5GGSLRBV4ZA"}],"slug":"Subcooled_boiling_regime_map_for_water_at_low_saturation_temperature_and_subatmospheric_pressure","translated_slug":"","page_count":11,"language":"en","content_type":"Work","owner":{"id":240164373,"first_name":"Bartosz","middle_initials":null,"last_name":"Zajaczkowski","page_name":"BartoszZajaczkowski","domain_name":"independent","created_at":"2022-10-13T05:00:14.997-07:00","display_name":"Bartosz Zajaczkowski","url":"https://independent.academia.edu/BartoszZajaczkowski"},"attachments":[{"id":92382005,"title":"","file_type":"pdf","scribd_thumbnail_url":"https://attachments.academia-assets.com/92382005/thumbnails/1.jpg","file_name":"j.expthermflusci.2020.11015020221013-1-3qqdbi.pdf","download_url":"https://www.academia.edu/attachments/92382005/download_file?st=MTczMjgyNzE5Miw4LjIyMi4yMDguMTQ2&","bulk_download_file_name":"Subcooled_boiling_regime_map_for_water_a.pdf","bulk_download_url":"https://d1wqtxts1xzle7.cloudfront.net/92382005/j.expthermflusci.2020.11015020221013-1-3qqdbi-libre.pdf?1665662720=\u0026response-content-disposition=attachment%3B+filename%3DSubcooled_boiling_regime_map_for_water_a.pdf\u0026Expires=1732830792\u0026Signature=KlpkT-5Hvpe1qFcaLkSMOhAmLvHH5NRPHCNC9GenBIofgrN2~xZ-D1ym3bgRXWOT22e~KK0UlYNNOXrH6xm8z-3lrGaYsuQnXnf26K82LVbRUwOgqjrKvo-hmMcftcCfLPBIgbJbVc7TZ5LnYIbokqCSMW-Vpm3o7JSU0aHz2R-zl8gAT2PmOooSJSbT~Z5prnZJSTOM5k4V4Dola~PGBhOfK749NDTeUG0Pp15toEkVDfTnb7e2oPlKV2C-K7T2tXvEeK8rPPLz6iAmum94403Xn4pBC9qNYbYr7B8wBKUH6uetBvzRQTkHO5RpmPc1cV-Uk7PtH2kOYM8A5OVbow__\u0026Key-Pair-Id=APKAJLOHF5GGSLRBV4ZA"}],"research_interests":[{"id":48,"name":"Engineering","url":"https://www.academia.edu/Documents/in/Engineering"},{"id":511,"name":"Materials Science","url":"https://www.academia.edu/Documents/in/Materials_Science"},{"id":522,"name":"Thermodynamics","url":"https://www.academia.edu/Documents/in/Thermodynamics"},{"id":152114,"name":"Bubble","url":"https://www.academia.edu/Documents/in/Bubble"},{"id":972442,"name":"Boiling","url":"https://www.academia.edu/Documents/in/Boiling"},{"id":1444999,"name":"Nucleate Boiling","url":"https://www.academia.edu/Documents/in/Nucleate_Boiling"},{"id":3156000,"name":"Subcooling","url":"https://www.academia.edu/Documents/in/Subcooling"}],"urls":[{"id":24729250,"url":"https://api.elsevier.com/content/article/PII:S0894177719321466?httpAccept=text/xml"}]}, dispatcherData: dispatcherData }); 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Due to heat and mass transfer limitations of working fluids, much effort is invested in developing a new generation of enhanced fluids, such as nanofluids. Previous studies reported improved thermal capacity when water was replaced by nanofluid. The interplay between nanoparticles and the evaporator surface is crucial here. However, the details of the deposition mechanism and its impact on boiling are still not known. This paper focusses on determining how the boiling process in the thermosyphon affects the inner wall of the evaporator and the nanofluid itself, and how it influences the thermal performance. For that purpose, we conducted the experimental study on a thermosyphon filled with silica nanofluid and then analyzed the samples of evaporator surface and silica nanofluid under a scanning electron microscope. Silica deposited into a porous layer during boiling, which enabled capillary wicking. This in turn decreased the overheating of the evaporator wall. Moreover, silica nanofluid increased heat transfer efficiency and transferred more thermal energy at low heat loads. After opening the thermosyphon, the deposited layer dried and split up. Based on two methods of crack pattern analysis, the mean thickness of the layer was estimated.","publication_date":{"day":null,"month":null,"year":2020,"errors":{}},"publication_name":"Heat Transfer Engineering","grobid_abstract_attachment_id":92382004},"translated_abstract":null,"internal_url":"https://www.academia.edu/88404033/Impact_of_Silica_Nanofluid_Deposition_on_Thermosyphon_Performance","translated_internal_url":"","created_at":"2022-10-13T05:03:29.838-07:00","preview_url":null,"current_user_can_edit":null,"current_user_is_owner":null,"owner_id":240164373,"coauthors_can_edit":true,"document_type":"paper","co_author_tags":[],"downloadable_attachments":[{"id":92382004,"title":"","file_type":"pdf","scribd_thumbnail_url":"https://attachments.academia-assets.com/92382004/thumbnails/1.jpg","file_name":"01457632.2020.181841320221013-1-f30c7f.pdf","download_url":"https://www.academia.edu/attachments/92382004/download_file?st=MTczMjgyNzE5Myw4LjIyMi4yMDguMTQ2&","bulk_download_file_name":"Impact_of_Silica_Nanofluid_Deposition_on.pdf","bulk_download_url":"https://d1wqtxts1xzle7.cloudfront.net/92382004/01457632.2020.181841320221013-1-f30c7f-libre.pdf?1665662734=\u0026response-content-disposition=attachment%3B+filename%3DImpact_of_Silica_Nanofluid_Deposition_on.pdf\u0026Expires=1732830792\u0026Signature=X4fIRTUx8pqWZm6A290j1b2TELe4TNxXk4bCnQ~BVVM3kgcVA8nklwcqgke1k8Yt8NBwLP4S1Y296B7I0Z2mecnV3kACx1qgKUQviNsYr2Go-Qf7nqVAtmH8wQTEK8X111oLjkQg8~LZXRj3y6S~psKVC2nAKO1HnwXBuBfMvJPQJ5YhkHA605v5XylFjI76qf3YoS~cCyOcOuElad03GrXIc~6UseON-NNUZfC7DNZTWTvCumLS4BAamz2vq~CcnR4gD0Zp-pgnLMeU4ZTcUD-uqPpaJB1b4agibICHQcV1J3BOAS4FXkGJRDvVGH0mPyMIpZ5X3q2TuA4xE0e3Tg__\u0026Key-Pair-Id=APKAJLOHF5GGSLRBV4ZA"}],"slug":"Impact_of_Silica_Nanofluid_Deposition_on_Thermosyphon_Performance","translated_slug":"","page_count":50,"language":"en","content_type":"Work","owner":{"id":240164373,"first_name":"Bartosz","middle_initials":null,"last_name":"Zajaczkowski","page_name":"BartoszZajaczkowski","domain_name":"independent","created_at":"2022-10-13T05:00:14.997-07:00","display_name":"Bartosz Zajaczkowski","url":"https://independent.academia.edu/BartoszZajaczkowski"},"attachments":[{"id":92382004,"title":"","file_type":"pdf","scribd_thumbnail_url":"https://attachments.academia-assets.com/92382004/thumbnails/1.jpg","file_name":"01457632.2020.181841320221013-1-f30c7f.pdf","download_url":"https://www.academia.edu/attachments/92382004/download_file?st=MTczMjgyNzE5Myw4LjIyMi4yMDguMTQ2&","bulk_download_file_name":"Impact_of_Silica_Nanofluid_Deposition_on.pdf","bulk_download_url":"https://d1wqtxts1xzle7.cloudfront.net/92382004/01457632.2020.181841320221013-1-f30c7f-libre.pdf?1665662734=\u0026response-content-disposition=attachment%3B+filename%3DImpact_of_Silica_Nanofluid_Deposition_on.pdf\u0026Expires=1732830792\u0026Signature=X4fIRTUx8pqWZm6A290j1b2TELe4TNxXk4bCnQ~BVVM3kgcVA8nklwcqgke1k8Yt8NBwLP4S1Y296B7I0Z2mecnV3kACx1qgKUQviNsYr2Go-Qf7nqVAtmH8wQTEK8X111oLjkQg8~LZXRj3y6S~psKVC2nAKO1HnwXBuBfMvJPQJ5YhkHA605v5XylFjI76qf3YoS~cCyOcOuElad03GrXIc~6UseON-NNUZfC7DNZTWTvCumLS4BAamz2vq~CcnR4gD0Zp-pgnLMeU4ZTcUD-uqPpaJB1b4agibICHQcV1J3BOAS4FXkGJRDvVGH0mPyMIpZ5X3q2TuA4xE0e3Tg__\u0026Key-Pair-Id=APKAJLOHF5GGSLRBV4ZA"}],"research_interests":[{"id":60,"name":"Mechanical Engineering","url":"https://www.academia.edu/Documents/in/Mechanical_Engineering"},{"id":305,"name":"Applied Mathematics","url":"https://www.academia.edu/Documents/in/Applied_Mathematics"},{"id":511,"name":"Materials Science","url":"https://www.academia.edu/Documents/in/Materials_Science"},{"id":144723,"name":"Nanofluid","url":"https://www.academia.edu/Documents/in/Nanofluid"},{"id":1340630,"name":"Chemical Engineering Heat \u0026 Mass Transfer","url":"https://www.academia.edu/Documents/in/Chemical_Engineering_Heat_and_Mass_Transfer"},{"id":1524533,"name":"Mechanical Engineering and heat and mass transfer","url":"https://www.academia.edu/Documents/in/Mechanical_Engineering_and_heat_and_mass_transfer"}],"urls":[{"id":24729247,"url":"https://www.tandfonline.com/doi/pdf/10.1080/01457632.2020.1818413"}]}, dispatcherData: dispatcherData }); $(this).data('initialized', true); } }); $a.trackClickSource(".js-work-strip-work-link", "profile_work_strip") }); </script> <div class="js-work-strip profile--work_container" data-work-id="88404029"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" href="https://www.academia.edu/88404029/The_effect_of_boiling_in_a_thermosyphon_on_surface_tension_and_contact_angle_of_silica_and_graphene_oxide_nanofluids"><img alt="Research paper thumbnail of The effect of boiling in a thermosyphon on surface tension and contact angle of silica and graphene oxide nanofluids" class="work-thumbnail" src="https://a.academia-assets.com/images/blank-paper.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" href="https://www.academia.edu/88404029/The_effect_of_boiling_in_a_thermosyphon_on_surface_tension_and_contact_angle_of_silica_and_graphene_oxide_nanofluids">The effect of boiling in a thermosyphon on surface tension and contact angle of silica and graphene oxide nanofluids</a></div><div class="wp-workCard_item"><span>Colloids and Surfaces A: Physicochemical and Engineering Aspects</span><span>, 2021</span></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">Abstract Thermosyphons are heat transfer devices characterised by high efficiency due to simultan...</span><a class="js-work-more-abstract" data-broccoli-component="work_strip.more_abstract" data-click-track="profile-work-strip-more-abstract" href="javascript:;"><span> more </span><span><i class="fa fa-caret-down"></i></span></a><span class="js-work-more-abstract-untruncated hidden">Abstract Thermosyphons are heat transfer devices characterised by high efficiency due to simultaneous phase changes occurring in the evaporation-condensation cycle of working fluid. One of the most promising solutions to enhance their heat transfer capacity of the device is the use of nanofluids – suspensions of particles with at least one dimension below 100 nm. It was determined that nanofluid does not influence the work of thermosyphons condenser section and the focus should be put on the boiling process in the evaporator section. During boiling, nanoparticles tend to deposit on the heater’s surface, what alters characteristics of this surface and near surface hydrodynamics. This changes the appearance of nanofluid, but the precise effect on how the deposition of particles affects the properties of nanofluid is unknown. Changes in surface tension and wettability affect boiling regimes (e.g. reduced surface tension reduces the size of departing bubbles and inhibits geysering), and efficiency of heat transfer through the device. Understanding of those parameters is crucial for the development of appropriate models describing heat transfer in thermosyphon working with nanofluids. The main goal of this study is to determine surface tension and contact angle of nanofluids based on silica nanoparticles and nano-sized graphene oxide flakes before and after the experimental boiling cycle in the thermosyphon. Results show that, in comparison with water, silica nanofluid (2 vol%) is characterised by lower surface tension and contact angles on both analysed surfaces. After-use silica nanofluid exhibited noticeably higher averaged surface tension and smaller contact angles in comparison to the fresh working medium. The change was most likely due to the decreased concentration caused by the deposition of nanoparticles during the thermosyphon operation. Still, the differences between before-use and after-use samples were smaller than the measurement uncertainties. Before-use graphene oxide nanofluid already showed surface tension and contact angle similar to water due to low concentration of graphene flakes (0.1 g/L). Consequently, the properties of after-use graphene oxide fluid were also not much different from water. Additional measurements of surface tension for graphene oxide nanofluid with and without addition of sodium dodecyl sulphate surfactant allowed to differentiate the effects caused by graphene flakes and surfactant. The surfactant reduced the surface tension of the nanofluid, but the change was smaller than in case of surfactant addition to pure water.</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="88404029"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span><span id="work-strip-rankings-button-container"></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="88404029"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 88404029; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); $(".js-view-count[data-work-id=88404029]").text(description); $(".js-view-count[data-work-id=88404029]").attr('title', description).tooltip(); }); });</script></span></span><span><span class="percentile-widget hidden"><span class="u-mr2x work-percentile"></span></span><script>$(function () { var workId = 88404029; window.Academia.workPercentilesFetcher.queue(workId, function (percentileText) { var container = $(".js-work-strip[data-work-id='88404029']"); container.find('.work-percentile').text(percentileText.charAt(0).toUpperCase() + percentileText.slice(1)); container.find('.percentile-widget').show(); container.find('.percentile-widget').removeClass('hidden'); }); });</script></span><span><script>$(function() { new Works.PaperRankView({ workId: 88404029, container: "", }); });</script></span></div><div id="work-strip-premium-row-container"></div></div></div><script> require.config({ waitSeconds: 90 })(["https://a.academia-assets.com/assets/wow_profile-f77ea15d77ce96025a6048a514272ad8becbad23c641fc2b3bd6e24ca6ff1932.js","https://a.academia-assets.com/assets/work_edit-ad038b8c047c1a8d4fa01b402d530ff93c45fee2137a149a4a5398bc8ad67560.js"], function() { // from javascript_helper.rb var dispatcherData = {} if (false){ window.WowProfile.dispatcher = window.WowProfile.dispatcher || _.clone(Backbone.Events); dispatcherData = { dispatcher: window.WowProfile.dispatcher, downloadLinkId: "-1" } } $('.js-work-strip[data-work-id=88404029]').each(function() { if (!$(this).data('initialized')) { new WowProfile.WorkStripView({ el: this, workJSON: {"id":88404029,"title":"The effect of boiling in a thermosyphon on surface tension and contact angle of silica and graphene oxide nanofluids","translated_title":"","metadata":{"abstract":"Abstract Thermosyphons are heat transfer devices characterised by high efficiency due to simultaneous phase changes occurring in the evaporation-condensation cycle of working fluid. One of the most promising solutions to enhance their heat transfer capacity of the device is the use of nanofluids – suspensions of particles with at least one dimension below 100 nm. It was determined that nanofluid does not influence the work of thermosyphons condenser section and the focus should be put on the boiling process in the evaporator section. During boiling, nanoparticles tend to deposit on the heater’s surface, what alters characteristics of this surface and near surface hydrodynamics. This changes the appearance of nanofluid, but the precise effect on how the deposition of particles affects the properties of nanofluid is unknown. Changes in surface tension and wettability affect boiling regimes (e.g. reduced surface tension reduces the size of departing bubbles and inhibits geysering), and efficiency of heat transfer through the device. Understanding of those parameters is crucial for the development of appropriate models describing heat transfer in thermosyphon working with nanofluids. The main goal of this study is to determine surface tension and contact angle of nanofluids based on silica nanoparticles and nano-sized graphene oxide flakes before and after the experimental boiling cycle in the thermosyphon. Results show that, in comparison with water, silica nanofluid (2 vol%) is characterised by lower surface tension and contact angles on both analysed surfaces. After-use silica nanofluid exhibited noticeably higher averaged surface tension and smaller contact angles in comparison to the fresh working medium. The change was most likely due to the decreased concentration caused by the deposition of nanoparticles during the thermosyphon operation. Still, the differences between before-use and after-use samples were smaller than the measurement uncertainties. Before-use graphene oxide nanofluid already showed surface tension and contact angle similar to water due to low concentration of graphene flakes (0.1 g/L). Consequently, the properties of after-use graphene oxide fluid were also not much different from water. Additional measurements of surface tension for graphene oxide nanofluid with and without addition of sodium dodecyl sulphate surfactant allowed to differentiate the effects caused by graphene flakes and surfactant. The surfactant reduced the surface tension of the nanofluid, but the change was smaller than in case of surfactant addition to pure water.","publisher":"Elsevier BV","publication_date":{"day":null,"month":null,"year":2021,"errors":{}},"publication_name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects"},"translated_abstract":"Abstract Thermosyphons are heat transfer devices characterised by high efficiency due to simultaneous phase changes occurring in the evaporation-condensation cycle of working fluid. One of the most promising solutions to enhance their heat transfer capacity of the device is the use of nanofluids – suspensions of particles with at least one dimension below 100 nm. It was determined that nanofluid does not influence the work of thermosyphons condenser section and the focus should be put on the boiling process in the evaporator section. During boiling, nanoparticles tend to deposit on the heater’s surface, what alters characteristics of this surface and near surface hydrodynamics. This changes the appearance of nanofluid, but the precise effect on how the deposition of particles affects the properties of nanofluid is unknown. Changes in surface tension and wettability affect boiling regimes (e.g. reduced surface tension reduces the size of departing bubbles and inhibits geysering), and efficiency of heat transfer through the device. Understanding of those parameters is crucial for the development of appropriate models describing heat transfer in thermosyphon working with nanofluids. The main goal of this study is to determine surface tension and contact angle of nanofluids based on silica nanoparticles and nano-sized graphene oxide flakes before and after the experimental boiling cycle in the thermosyphon. Results show that, in comparison with water, silica nanofluid (2 vol%) is characterised by lower surface tension and contact angles on both analysed surfaces. After-use silica nanofluid exhibited noticeably higher averaged surface tension and smaller contact angles in comparison to the fresh working medium. The change was most likely due to the decreased concentration caused by the deposition of nanoparticles during the thermosyphon operation. Still, the differences between before-use and after-use samples were smaller than the measurement uncertainties. Before-use graphene oxide nanofluid already showed surface tension and contact angle similar to water due to low concentration of graphene flakes (0.1 g/L). Consequently, the properties of after-use graphene oxide fluid were also not much different from water. Additional measurements of surface tension for graphene oxide nanofluid with and without addition of sodium dodecyl sulphate surfactant allowed to differentiate the effects caused by graphene flakes and surfactant. The surfactant reduced the surface tension of the nanofluid, but the change was smaller than in case of surfactant addition to pure water.","internal_url":"https://www.academia.edu/88404029/The_effect_of_boiling_in_a_thermosyphon_on_surface_tension_and_contact_angle_of_silica_and_graphene_oxide_nanofluids","translated_internal_url":"","created_at":"2022-10-13T05:03:29.625-07:00","preview_url":null,"current_user_can_edit":null,"current_user_is_owner":null,"owner_id":240164373,"coauthors_can_edit":true,"document_type":"paper","co_author_tags":[],"downloadable_attachments":[],"slug":"The_effect_of_boiling_in_a_thermosyphon_on_surface_tension_and_contact_angle_of_silica_and_graphene_oxide_nanofluids","translated_slug":"","page_count":null,"language":"en","content_type":"Work","owner":{"id":240164373,"first_name":"Bartosz","middle_initials":null,"last_name":"Zajaczkowski","page_name":"BartoszZajaczkowski","domain_name":"independent","created_at":"2022-10-13T05:00:14.997-07:00","display_name":"Bartosz Zajaczkowski","url":"https://independent.academia.edu/BartoszZajaczkowski"},"attachments":[],"research_interests":[{"id":48,"name":"Engineering","url":"https://www.academia.edu/Documents/in/Engineering"},{"id":511,"name":"Materials Science","url":"https://www.academia.edu/Documents/in/Materials_Science"},{"id":8067,"name":"Heat Transfer","url":"https://www.academia.edu/Documents/in/Heat_Transfer"},{"id":118582,"name":"Physical sciences","url":"https://www.academia.edu/Documents/in/Physical_sciences"},{"id":144723,"name":"Nanofluid","url":"https://www.academia.edu/Documents/in/Nanofluid"},{"id":161126,"name":"Contact angle","url":"https://www.academia.edu/Documents/in/Contact_angle"},{"id":211877,"name":"Wetting","url":"https://www.academia.edu/Documents/in/Wetting"},{"id":260118,"name":"CHEMICAL SCIENCES","url":"https://www.academia.edu/Documents/in/CHEMICAL_SCIENCES"},{"id":394521,"name":"Surface Tension","url":"https://www.academia.edu/Documents/in/Surface_Tension"},{"id":972442,"name":"Boiling","url":"https://www.academia.edu/Documents/in/Boiling"}],"urls":[{"id":24729243,"url":"https://api.elsevier.com/content/article/PII:S0927775721009511?httpAccept=text/xml"}]}, dispatcherData: dispatcherData }); $(this).data('initialized', true); } }); $a.trackClickSource(".js-work-strip-work-link", "profile_work_strip") }); </script> <div class="js-work-strip profile--work_container" data-work-id="88404024"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" href="https://www.academia.edu/88404024/Pool_boiling_heat_transfer_coefficient_of_dimethyl_ether_and_its_azeotropic_ternary_mixtures"><img alt="Research paper thumbnail of Pool boiling heat transfer coefficient of dimethyl ether and its azeotropic ternary mixtures" class="work-thumbnail" src="https://a.academia-assets.com/images/blank-paper.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" href="https://www.academia.edu/88404024/Pool_boiling_heat_transfer_coefficient_of_dimethyl_ether_and_its_azeotropic_ternary_mixtures">Pool boiling heat transfer coefficient of dimethyl ether and its azeotropic ternary mixtures</a></div><div class="wp-workCard_item"><span>International Journal of Heat and Mass Transfer</span><span>, 2021</span></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">Abstract Dimethyl ether (DME) is a popular medium widely used in industrial applications. Being h...</span><a class="js-work-more-abstract" data-broccoli-component="work_strip.more_abstract" data-click-track="profile-work-strip-more-abstract" href="javascript:;"><span> more </span><span><i class="fa fa-caret-down"></i></span></a><span class="js-work-more-abstract-untruncated hidden">Abstract Dimethyl ether (DME) is a popular medium widely used in industrial applications. Being highly flammable substance, only recently it has again found commercial use as a primary working fluid in cooling and heating systems. Known as refrigerant RE170, it is now considered to be one of the potential natural refrigerants of the future due to minimal Global Warming Potential and zero Ozone Depletion Potential. Two novel azeotropic ternary mixtures of RE170/R1234yf/R152a were developed in order to improve cooling capacity and performance of a dimethyl ether refrigeration cycle. The mass ratios were purposefully selected to offer high cycle efficiency COP, high specific cooling capacity q e , small specific volume of vapour, reduced compressor power requirements, and the smallest possible temperature glide. The mixtures were subjected to experimental analysis in order to establish to what degree the added fluids (R1234yf and R152a) influence boiling and heat transfer performance. Boiling curves and heat transfer coefficients were determined experimentally and compared with the values obtained for pure RE170. Finally, several known heat transfer coefficient correlations (suitable for both hydrocarbons and synthetic refrigerants) were applied to the resulting data and evaluated for accuracy by evaluation of MAPE. The Cooper correlation was the most accurate for for ternary mixtures of dimethyl ether in the broadest range of temperatures, heat fluxes, and compositions (MAPE between 3.5-19.8). In order to improve the accuracy even further, the original Cooper correlation was modified with the acentric factor and the molecular mass power factor was optimised for modern chloride-less refrigerants. Resulting equation, when applied to ternary mixtures, returns errors below 5% in the entire range of experimental data.</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="88404024"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span><span id="work-strip-rankings-button-container"></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="88404024"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 88404024; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); $(".js-view-count[data-work-id=88404024]").text(description); $(".js-view-count[data-work-id=88404024]").attr('title', description).tooltip(); }); });</script></span></span><span><span class="percentile-widget hidden"><span class="u-mr2x work-percentile"></span></span><script>$(function () { var workId = 88404024; window.Academia.workPercentilesFetcher.queue(workId, function (percentileText) { var container = $(".js-work-strip[data-work-id='88404024']"); container.find('.work-percentile').text(percentileText.charAt(0).toUpperCase() + percentileText.slice(1)); container.find('.percentile-widget').show(); container.find('.percentile-widget').removeClass('hidden'); }); });</script></span><span><script>$(function() { new Works.PaperRankView({ workId: 88404024, container: "", }); });</script></span></div><div id="work-strip-premium-row-container"></div></div></div><script> require.config({ waitSeconds: 90 })(["https://a.academia-assets.com/assets/wow_profile-f77ea15d77ce96025a6048a514272ad8becbad23c641fc2b3bd6e24ca6ff1932.js","https://a.academia-assets.com/assets/work_edit-ad038b8c047c1a8d4fa01b402d530ff93c45fee2137a149a4a5398bc8ad67560.js"], function() { // from javascript_helper.rb var dispatcherData = {} if (false){ window.WowProfile.dispatcher = window.WowProfile.dispatcher || _.clone(Backbone.Events); dispatcherData = { dispatcher: window.WowProfile.dispatcher, downloadLinkId: "-1" } } $('.js-work-strip[data-work-id=88404024]').each(function() { if (!$(this).data('initialized')) { new WowProfile.WorkStripView({ el: this, workJSON: {"id":88404024,"title":"Pool boiling heat transfer coefficient of dimethyl ether and its azeotropic ternary mixtures","translated_title":"","metadata":{"abstract":"Abstract Dimethyl ether (DME) is a popular medium widely used in industrial applications. Being highly flammable substance, only recently it has again found commercial use as a primary working fluid in cooling and heating systems. Known as refrigerant RE170, it is now considered to be one of the potential natural refrigerants of the future due to minimal Global Warming Potential and zero Ozone Depletion Potential. Two novel azeotropic ternary mixtures of RE170/R1234yf/R152a were developed in order to improve cooling capacity and performance of a dimethyl ether refrigeration cycle. The mass ratios were purposefully selected to offer high cycle efficiency COP, high specific cooling capacity q e , small specific volume of vapour, reduced compressor power requirements, and the smallest possible temperature glide. The mixtures were subjected to experimental analysis in order to establish to what degree the added fluids (R1234yf and R152a) influence boiling and heat transfer performance. Boiling curves and heat transfer coefficients were determined experimentally and compared with the values obtained for pure RE170. Finally, several known heat transfer coefficient correlations (suitable for both hydrocarbons and synthetic refrigerants) were applied to the resulting data and evaluated for accuracy by evaluation of MAPE. The Cooper correlation was the most accurate for for ternary mixtures of dimethyl ether in the broadest range of temperatures, heat fluxes, and compositions (MAPE between 3.5-19.8). In order to improve the accuracy even further, the original Cooper correlation was modified with the acentric factor and the molecular mass power factor was optimised for modern chloride-less refrigerants. Resulting equation, when applied to ternary mixtures, returns errors below 5% in the entire range of experimental data.","publisher":"Elsevier BV","publication_date":{"day":null,"month":null,"year":2021,"errors":{}},"publication_name":"International Journal of Heat and Mass Transfer"},"translated_abstract":"Abstract Dimethyl ether (DME) is a popular medium widely used in industrial applications. Being highly flammable substance, only recently it has again found commercial use as a primary working fluid in cooling and heating systems. Known as refrigerant RE170, it is now considered to be one of the potential natural refrigerants of the future due to minimal Global Warming Potential and zero Ozone Depletion Potential. Two novel azeotropic ternary mixtures of RE170/R1234yf/R152a were developed in order to improve cooling capacity and performance of a dimethyl ether refrigeration cycle. The mass ratios were purposefully selected to offer high cycle efficiency COP, high specific cooling capacity q e , small specific volume of vapour, reduced compressor power requirements, and the smallest possible temperature glide. The mixtures were subjected to experimental analysis in order to establish to what degree the added fluids (R1234yf and R152a) influence boiling and heat transfer performance. Boiling curves and heat transfer coefficients were determined experimentally and compared with the values obtained for pure RE170. Finally, several known heat transfer coefficient correlations (suitable for both hydrocarbons and synthetic refrigerants) were applied to the resulting data and evaluated for accuracy by evaluation of MAPE. The Cooper correlation was the most accurate for for ternary mixtures of dimethyl ether in the broadest range of temperatures, heat fluxes, and compositions (MAPE between 3.5-19.8). In order to improve the accuracy even further, the original Cooper correlation was modified with the acentric factor and the molecular mass power factor was optimised for modern chloride-less refrigerants. Resulting equation, when applied to ternary mixtures, returns errors below 5% in the entire range of experimental data.","internal_url":"https://www.academia.edu/88404024/Pool_boiling_heat_transfer_coefficient_of_dimethyl_ether_and_its_azeotropic_ternary_mixtures","translated_internal_url":"","created_at":"2022-10-13T05:03:29.404-07:00","preview_url":null,"current_user_can_edit":null,"current_user_is_owner":null,"owner_id":240164373,"coauthors_can_edit":true,"document_type":"paper","co_author_tags":[],"downloadable_attachments":[],"slug":"Pool_boiling_heat_transfer_coefficient_of_dimethyl_ether_and_its_azeotropic_ternary_mixtures","translated_slug":"","page_count":null,"language":"en","content_type":"Work","owner":{"id":240164373,"first_name":"Bartosz","middle_initials":null,"last_name":"Zajaczkowski","page_name":"BartoszZajaczkowski","domain_name":"independent","created_at":"2022-10-13T05:00:14.997-07:00","display_name":"Bartosz Zajaczkowski","url":"https://independent.academia.edu/BartoszZajaczkowski"},"attachments":[],"research_interests":[{"id":48,"name":"Engineering","url":"https://www.academia.edu/Documents/in/Engineering"},{"id":511,"name":"Materials Science","url":"https://www.academia.edu/Documents/in/Materials_Science"},{"id":522,"name":"Thermodynamics","url":"https://www.academia.edu/Documents/in/Thermodynamics"},{"id":33661,"name":"Heat and Mass Transfer","url":"https://www.academia.edu/Documents/in/Heat_and_Mass_Transfer"},{"id":80414,"name":"Mathematical Sciences","url":"https://www.academia.edu/Documents/in/Mathematical_Sciences"},{"id":118582,"name":"Physical sciences","url":"https://www.academia.edu/Documents/in/Physical_sciences"}],"urls":[{"id":24729240,"url":"https://api.elsevier.com/content/article/PII:S0017931021001666?httpAccept=text/xml"}]}, dispatcherData: dispatcherData }); $(this).data('initialized', true); } }); $a.trackClickSource(".js-work-strip-work-link", "profile_work_strip") }); </script> <div class="js-work-strip profile--work_container" data-work-id="88404021"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" href="https://www.academia.edu/88404021/Influence_of_saturation_temperature_and_heat_flux_on_pool_boiling_of_R245fa"><img alt="Research paper thumbnail of Influence of saturation temperature and heat flux on pool boiling of R245fa" class="work-thumbnail" src="https://attachments.academia-assets.com/92381997/thumbnails/1.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" href="https://www.academia.edu/88404021/Influence_of_saturation_temperature_and_heat_flux_on_pool_boiling_of_R245fa">Influence of saturation temperature and heat flux on pool boiling of R245fa</a></div><div class="wp-workCard_item"><span>Experimental Heat Transfer</span><span>, 2020</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="4496443fdc70ee041d92d3611116a875" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":92381997,"asset_id":88404021,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/92381997/download_file?st=MTczMjgyNzE5Myw4LjIyMi4yMDguMTQ2&s=profile"><span><i class="fa fa-arrow-down"></i></span><span>Download</span></a><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="88404021"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span><span id="work-strip-rankings-button-container"></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="88404021"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 88404021; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); $(".js-view-count[data-work-id=88404021]").text(description); $(".js-view-count[data-work-id=88404021]").attr('title', description).tooltip(); }); });</script></span></span><span><span class="percentile-widget hidden"><span class="u-mr2x work-percentile"></span></span><script>$(function () { var workId = 88404021; window.Academia.workPercentilesFetcher.queue(workId, function (percentileText) { var container = $(".js-work-strip[data-work-id='88404021']"); container.find('.work-percentile').text(percentileText.charAt(0).toUpperCase() + percentileText.slice(1)); container.find('.percentile-widget').show(); container.find('.percentile-widget').removeClass('hidden'); }); });</script></span><span><script>$(function() { new Works.PaperRankView({ workId: 88404021, container: "", }); });</script></span></div><div id="work-strip-premium-row-container"></div></div></div><script> require.config({ waitSeconds: 90 })(["https://a.academia-assets.com/assets/wow_profile-f77ea15d77ce96025a6048a514272ad8becbad23c641fc2b3bd6e24ca6ff1932.js","https://a.academia-assets.com/assets/work_edit-ad038b8c047c1a8d4fa01b402d530ff93c45fee2137a149a4a5398bc8ad67560.js"], function() { // from javascript_helper.rb var dispatcherData = {} if (true){ window.WowProfile.dispatcher = window.WowProfile.dispatcher || _.clone(Backbone.Events); dispatcherData = { dispatcher: window.WowProfile.dispatcher, downloadLinkId: "4496443fdc70ee041d92d3611116a875" } } $('.js-work-strip[data-work-id=88404021]').each(function() { if (!$(this).data('initialized')) { new WowProfile.WorkStripView({ el: this, workJSON: {"id":88404021,"title":"Influence of saturation temperature and heat flux on pool boiling of R245fa","translated_title":"","metadata":{"publisher":"Informa UK Limited","grobid_abstract":"Low-pressure refrigerants such as R245fa allow compact design of IT cooling systems intended for harsh environments. Nucleate boiling of R245fa on an electrically heated flat horizontal surface was experimentally studied. Heat fluxes q w were 30-65 kW=m 2 and saturation temperatures 40-70 � C. Results show that the heat-transfer coefficient HTC increases with both heat flux and temperature, and that higher heat fluxes/temperatures lessen the HTC dependence on temperature/heat flux. For instance, increasing temperature from 40 to 70 � C translates into change of the exponent n in the HTC / q n w from 0.60 to 0.50. Therefore, pool-boiling correlations employing n ¼ const do not accurately reflect the HTC / q n w dependence. Comparing the experimental data with nucleate boiling correlations showed that the models of Kruzhilin and Mostinski were the most accurate with the Mean Absolute Percentage Error MAPE equal to 16.6% and 32.9%, respectively. The data were then used to optimize the model of Rohsenow and increase its accuracy. This model was chosen for optimization as it is the only model among the analyzed in this paper which incorporates a description of both surface roughness and contact angle. These properties are addressed using an empirical parameter C sf. Optimizing this parameter allowed the characterization of the interface between R245fa and heating surface used in this study. 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Six samples (mPCM slurry concentrate with the water solution of propylene glycol used as a main base liquid) were prepared. As the concentrate contains 43.0% mPCM, the actual mass fraction amounts to 8.6, 12.9, 17.2, 21.5, 25.8, and 30.1 wt%, respectively. The thermal delay method was used. Samples were cooled from 50 °C to 10 °C. A higher concentration of microcapsules caused a proportional increase in the specific heat of slurry at the main peak melting temperature. The maximum value of the specific heat changed from 9.2 to 33.7 kJ/kg for 8.6 wt%, and 30.1 wt%, respectively. The specific heat of the mPCM slurry is a constant quantity and depends on the concentration of the microcapsules. The specific heat of the slurry (PCM inside microcapsules in a liquid form) d...</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="d3e0b853fe5dba330a71ba70eb68351c" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":92381941,"asset_id":88404057,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/92381941/download_file?st=MTczMjgyNzE5Myw4LjIyMi4yMDguMTQ2&st=MTczMjgyNzE5Miw4LjIyMi4yMDguMTQ2&s=profile"><span><i class="fa fa-arrow-down"></i></span><span>Download</span></a><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="88404057"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span><span id="work-strip-rankings-button-container"></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="88404057"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 88404057; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); $(".js-view-count[data-work-id=88404057]").text(description); $(".js-view-count[data-work-id=88404057]").attr('title', description).tooltip(); }); });</script></span></span><span><span class="percentile-widget hidden"><span class="u-mr2x work-percentile"></span></span><script>$(function () { var workId = 88404057; window.Academia.workPercentilesFetcher.queue(workId, function (percentileText) { var container = $(".js-work-strip[data-work-id='88404057']"); container.find('.work-percentile').text(percentileText.charAt(0).toUpperCase() + percentileText.slice(1)); container.find('.percentile-widget').show(); container.find('.percentile-widget').removeClass('hidden'); }); });</script></span><span><script>$(function() { new Works.PaperRankView({ workId: 88404057, container: "", }); });</script></span></div><div id="work-strip-premium-row-container"></div></div></div><script> require.config({ waitSeconds: 90 })(["https://a.academia-assets.com/assets/wow_profile-f77ea15d77ce96025a6048a514272ad8becbad23c641fc2b3bd6e24ca6ff1932.js","https://a.academia-assets.com/assets/work_edit-ad038b8c047c1a8d4fa01b402d530ff93c45fee2137a149a4a5398bc8ad67560.js"], function() { // from javascript_helper.rb var dispatcherData = {} if (true){ window.WowProfile.dispatcher = window.WowProfile.dispatcher || _.clone(Backbone.Events); dispatcherData = { dispatcher: window.WowProfile.dispatcher, downloadLinkId: "d3e0b853fe5dba330a71ba70eb68351c" } } $('.js-work-strip[data-work-id=88404057]').each(function() { if (!$(this).data('initialized')) { new WowProfile.WorkStripView({ el: this, workJSON: {"id":88404057,"title":"Determining the Heat of Fusion and Specific Heat of Microencapsulated Phase Change Material Slurry by Thermal Delay Method","translated_title":"","metadata":{"abstract":"This paper details an experimental study that was performed to investigate the specific heat of microencapsulated phase change material (mPCM) slurry and its heat of fusion at the PCM phase change transition temperature. 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The specific heat of the mPCM slurry is a constant quantity and depends on the concentration of the microcapsules. 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Technologies. Materials.</span><span>, 2019</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="ed1357a5dc10b1d2001b9433d1cb091c" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":92381944,"asset_id":88404055,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/92381944/download_file?st=MTczMjgyNzE5Myw4LjIyMi4yMDguMTQ2&st=MTczMjgyNzE5Miw4LjIyMi4yMDguMTQ2&s=profile"><span><i class="fa fa-arrow-down"></i></span><span>Download</span></a><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="88404055"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span><span id="work-strip-rankings-button-container"></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="88404055"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 88404055; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); $(".js-view-count[data-work-id=88404055]").text(description); $(".js-view-count[data-work-id=88404055]").attr('title', description).tooltip(); }); });</script></span></span><span><span class="percentile-widget hidden"><span class="u-mr2x work-percentile"></span></span><script>$(function () { var workId = 88404055; window.Academia.workPercentilesFetcher.queue(workId, function (percentileText) { var container = $(".js-work-strip[data-work-id='88404055']"); container.find('.work-percentile').text(percentileText.charAt(0).toUpperCase() + percentileText.slice(1)); container.find('.percentile-widget').show(); container.find('.percentile-widget').removeClass('hidden'); }); });</script></span><span><script>$(function() { new Works.PaperRankView({ workId: 88404055, container: "", }); });</script></span></div><div id="work-strip-premium-row-container"></div></div></div><script> require.config({ waitSeconds: 90 })(["https://a.academia-assets.com/assets/wow_profile-f77ea15d77ce96025a6048a514272ad8becbad23c641fc2b3bd6e24ca6ff1932.js","https://a.academia-assets.com/assets/work_edit-ad038b8c047c1a8d4fa01b402d530ff93c45fee2137a149a4a5398bc8ad67560.js"], function() { // from javascript_helper.rb var dispatcherData = {} if (true){ window.WowProfile.dispatcher = window.WowProfile.dispatcher || _.clone(Backbone.Events); dispatcherData = { dispatcher: window.WowProfile.dispatcher, downloadLinkId: "ed1357a5dc10b1d2001b9433d1cb091c" } } $('.js-work-strip[data-work-id=88404055]').each(function() { if (!$(this).data('initialized')) { new WowProfile.WorkStripView({ el: this, workJSON: {"id":88404055,"title":"Determination of geyser events in a thermosyphon working with graphene oxide nanofluid","translated_title":"","metadata":{"publisher":"Scientific Technical Union of Mechanical Engineering *Industry 4.0*","grobid_abstract":"Two-phase closed thermosyphons are efficient passive devices with potential for using in many heat transfer applications. One of the boiling regimes that may occur is the geyser boiling. It is a repetitive irregular process of pushing liquid without its previous evaporation in the direction of condenser. Although it does not affect time-averaged thermal performance of the device, it causes additional mechanical load and shortens the lifetime of the device. Unfortunately, geysering is not well investigated, thus no precise definition exists. This paper focuses on the process of data reduction that leads to geyser boiling detection. It may be applied for various working fluids and operating conditions. Two parameters are crucial for recognizing geyser events from the background noise (pressure variations followed by the geyser): the minimum amplitude of pressure increase and waiting period between ensuing events. We compared two working fluids: water and graphene oxide nanofluid. 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$(this).data('initialized', true); } }); $a.trackClickSource(".js-work-strip-work-link", "profile_work_strip") }); </script> <div class="js-work-strip profile--work_container" data-work-id="88404054"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" href="https://www.academia.edu/88404054/Controlling_vapor_quality_of_R245fa_in_a_microchannel_evaporator"><img alt="Research paper thumbnail of Controlling vapor quality of R245fa in a microchannel evaporator" class="work-thumbnail" src="https://a.academia-assets.com/images/blank-paper.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" href="https://www.academia.edu/88404054/Controlling_vapor_quality_of_R245fa_in_a_microchannel_evaporator">Controlling vapor quality of R245fa in a microchannel evaporator</a></div><div class="wp-workCard_item"><span>Proceedings of the 25<sup>th</sup> IIR International Congress of Refrigeration: Montréal , Canada, August 24-30, 2019.</span><span>, Aug 24, 2019</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="88404054"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span><span id="work-strip-rankings-button-container"></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="88404054"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 88404054; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); $(".js-view-count[data-work-id=88404054]").text(description); $(".js-view-count[data-work-id=88404054]").attr('title', description).tooltip(); }); });</script></span></span><span><span class="percentile-widget hidden"><span class="u-mr2x work-percentile"></span></span><script>$(function () { var workId = 88404054; window.Academia.workPercentilesFetcher.queue(workId, function (percentileText) { var container = $(".js-work-strip[data-work-id='88404054']"); container.find('.work-percentile').text(percentileText.charAt(0).toUpperCase() + percentileText.slice(1)); container.find('.percentile-widget').show(); container.find('.percentile-widget').removeClass('hidden'); }); });</script></span><span><script>$(function() { new Works.PaperRankView({ workId: 88404054, container: "", }); });</script></span></div><div id="work-strip-premium-row-container"></div></div></div><script> require.config({ waitSeconds: 90 })(["https://a.academia-assets.com/assets/wow_profile-f77ea15d77ce96025a6048a514272ad8becbad23c641fc2b3bd6e24ca6ff1932.js","https://a.academia-assets.com/assets/work_edit-ad038b8c047c1a8d4fa01b402d530ff93c45fee2137a149a4a5398bc8ad67560.js"], function() { // from javascript_helper.rb var dispatcherData = {} if (false){ window.WowProfile.dispatcher = window.WowProfile.dispatcher || _.clone(Backbone.Events); dispatcherData = { dispatcher: window.WowProfile.dispatcher, downloadLinkId: "-1" } } $('.js-work-strip[data-work-id=88404054]').each(function() { if (!$(this).data('initialized')) { new WowProfile.WorkStripView({ el: this, workJSON: {"id":88404054,"title":"Controlling vapor quality of R245fa in a microchannel evaporator","translated_title":"","metadata":{"publication_date":{"day":24,"month":8,"year":2019,"errors":{}},"publication_name":"Proceedings of the 25\u003csup\u003eth\u003c/sup\u003e IIR International Congress of Refrigeration: Montréal , Canada, August 24-30, 2019."},"translated_abstract":null,"internal_url":"https://www.academia.edu/88404054/Controlling_vapor_quality_of_R245fa_in_a_microchannel_evaporator","translated_internal_url":"","created_at":"2022-10-13T05:03:32.350-07:00","preview_url":null,"current_user_can_edit":null,"current_user_is_owner":null,"owner_id":240164373,"coauthors_can_edit":true,"document_type":"paper","co_author_tags":[],"downloadable_attachments":[],"slug":"Controlling_vapor_quality_of_R245fa_in_a_microchannel_evaporator","translated_slug":"","page_count":null,"language":"en","content_type":"Work","owner":{"id":240164373,"first_name":"Bartosz","middle_initials":null,"last_name":"Zajaczkowski","page_name":"BartoszZajaczkowski","domain_name":"independent","created_at":"2022-10-13T05:00:14.997-07:00","display_name":"Bartosz Zajaczkowski","url":"https://independent.academia.edu/BartoszZajaczkowski"},"attachments":[],"research_interests":[{"id":474021,"name":"Evaporator","url":"https://www.academia.edu/Documents/in/Evaporator"}],"urls":[{"id":24729254,"url":"https://iifiir.org/en/fridoc/34721"}]}, dispatcherData: dispatcherData }); $(this).data('initialized', true); } }); $a.trackClickSource(".js-work-strip-work-link", "profile_work_strip") }); </script> <div class="js-work-strip profile--work_container" data-work-id="88404053"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" href="https://www.academia.edu/88404053/Performance_analysis_and_cycle_time_optimization_of_a_single_evaporator_three_bed_solid_sorption_refrigeration_system_driven_by_low_temperature_heat_source"><img alt="Research paper thumbnail of Performance analysis and cycle time optimization of a single evaporator three-bed solid-sorption refrigeration system driven by low-temperature heat source" class="work-thumbnail" src="https://a.academia-assets.com/images/blank-paper.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" href="https://www.academia.edu/88404053/Performance_analysis_and_cycle_time_optimization_of_a_single_evaporator_three_bed_solid_sorption_refrigeration_system_driven_by_low_temperature_heat_source">Performance analysis and cycle time optimization of a single evaporator three-bed solid-sorption refrigeration system driven by low-temperature heat source</a></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">This paper discusses performance analysis and cycle time optimization of a three-bed silica-gel/w...</span><a class="js-work-more-abstract" data-broccoli-component="work_strip.more_abstract" data-click-track="profile-work-strip-more-abstract" href="javascript:;"><span> more </span><span><i class="fa fa-caret-down"></i></span></a><span class="js-work-more-abstract-untruncated hidden">This paper discusses performance analysis and cycle time optimization of a three-bed silica-gel/water adsorption chiller. Presented study builds upon the fact that desorption phase requires noticeably less time than adsorption phase, i.e. desorption is 2.2-3.5 times faster than adsorption. The operating cycle was simulated using a numerical model. Lengths of adsorption/desorption phases and the offset time between individual adsorbers were varied for optimal performance. The results show that third bed increased cooling capacity of adsorption chiller. The optimal total cycle time that yields the highest cooling capacity is slightly shorter than in a two-bed setup. The difference is larger if the chiller is driven by lower temperature, 65°C instead of 85°C. The optimal ratio between the time of desorption and the time of adsorption in a three-bed system is f ~ 0.6, while it is f ~ 0.8 in a two-bed system. The optimal offset time is 1/3 of the total cycle time. The cycle time optimiza...</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="88404053"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span><span id="work-strip-rankings-button-container"></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="88404053"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 88404053; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); $(".js-view-count[data-work-id=88404053]").text(description); $(".js-view-count[data-work-id=88404053]").attr('title', description).tooltip(); }); });</script></span></span><span><span class="percentile-widget hidden"><span class="u-mr2x work-percentile"></span></span><script>$(function () { var workId = 88404053; window.Academia.workPercentilesFetcher.queue(workId, function (percentileText) { var container = $(".js-work-strip[data-work-id='88404053']"); container.find('.work-percentile').text(percentileText.charAt(0).toUpperCase() + percentileText.slice(1)); container.find('.percentile-widget').show(); container.find('.percentile-widget').removeClass('hidden'); }); });</script></span><span><script>$(function() { new Works.PaperRankView({ workId: 88404053, container: "", }); });</script></span></div><div id="work-strip-premium-row-container"></div></div></div><script> require.config({ waitSeconds: 90 })(["https://a.academia-assets.com/assets/wow_profile-f77ea15d77ce96025a6048a514272ad8becbad23c641fc2b3bd6e24ca6ff1932.js","https://a.academia-assets.com/assets/work_edit-ad038b8c047c1a8d4fa01b402d530ff93c45fee2137a149a4a5398bc8ad67560.js"], function() { // from javascript_helper.rb var dispatcherData = {} if (false){ window.WowProfile.dispatcher = window.WowProfile.dispatcher || _.clone(Backbone.Events); dispatcherData = { dispatcher: window.WowProfile.dispatcher, downloadLinkId: "-1" } } $('.js-work-strip[data-work-id=88404053]').each(function() { if (!$(this).data('initialized')) { new WowProfile.WorkStripView({ el: this, workJSON: {"id":88404053,"title":"Performance analysis and cycle time optimization of a single evaporator three-bed solid-sorption refrigeration system driven by low-temperature heat source","translated_title":"","metadata":{"abstract":"This paper discusses performance analysis and cycle time optimization of a three-bed silica-gel/water adsorption chiller. Presented study builds upon the fact that desorption phase requires noticeably less time than adsorption phase, i.e. desorption is 2.2-3.5 times faster than adsorption. The operating cycle was simulated using a numerical model. Lengths of adsorption/desorption phases and the offset time between individual adsorbers were varied for optimal performance. The results show that third bed increased cooling capacity of adsorption chiller. The optimal total cycle time that yields the highest cooling capacity is slightly shorter than in a two-bed setup. The difference is larger if the chiller is driven by lower temperature, 65°C instead of 85°C. The optimal ratio between the time of desorption and the time of adsorption in a three-bed system is f ~ 0.6, while it is f ~ 0.8 in a two-bed system. The optimal offset time is 1/3 of the total cycle time. The cycle time optimiza...","publisher":"International Institute of Refrigeration (IIR)","publication_date":{"day":null,"month":null,"year":2015,"errors":{}}},"translated_abstract":"This paper discusses performance analysis and cycle time optimization of a three-bed silica-gel/water adsorption chiller. Presented study builds upon the fact that desorption phase requires noticeably less time than adsorption phase, i.e. desorption is 2.2-3.5 times faster than adsorption. The operating cycle was simulated using a numerical model. Lengths of adsorption/desorption phases and the offset time between individual adsorbers were varied for optimal performance. The results show that third bed increased cooling capacity of adsorption chiller. The optimal total cycle time that yields the highest cooling capacity is slightly shorter than in a two-bed setup. The difference is larger if the chiller is driven by lower temperature, 65°C instead of 85°C. The optimal ratio between the time of desorption and the time of adsorption in a three-bed system is f ~ 0.6, while it is f ~ 0.8 in a two-bed system. The optimal offset time is 1/3 of the total cycle time. 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The effect of the metastable flow region outlet refrigerant parameters and real working parameters of capillary tube is presented. 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The eq...</span><a class="js-work-more-abstract" data-broccoli-component="work_strip.more_abstract" data-click-track="profile-work-strip-more-abstract" href="javascript:;"><span> more </span><span><i class="fa fa-caret-down"></i></span></a><span class="js-work-more-abstract-untruncated hidden">This article contains thermodynamic analysis of solid sorption chemical heat pump systems. The equations proposed were used to design a device suitable for waste heat recovery. 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$(this).data('initialized', true); } }); $a.trackClickSource(".js-work-strip-work-link", "profile_work_strip") }); </script> <div class="js-work-strip profile--work_container" data-work-id="88404038"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" href="https://www.academia.edu/88404038/Subcooled_boiling_regime_map_for_water_at_low_saturation_temperature_and_subatmospheric_pressure"><img alt="Research paper thumbnail of Subcooled boiling regime map for water at low saturation temperature and subatmospheric pressure" class="work-thumbnail" src="https://attachments.academia-assets.com/92382005/thumbnails/1.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" href="https://www.academia.edu/88404038/Subcooled_boiling_regime_map_for_water_at_low_saturation_temperature_and_subatmospheric_pressure">Subcooled boiling regime map for water at low saturation temperature and subatmospheric pressure</a></div><div class="wp-workCard_item"><span>Experimental Thermal and Fluid Science</span><span>, 2020</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="5c188b42bf0c54942abdd9b1c765f1d2" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":92382005,"asset_id":88404038,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/92382005/download_file?st=MTczMjgyNzE5Myw4LjIyMi4yMDguMTQ2&st=MTczMjgyNzE5Miw4LjIyMi4yMDguMTQ2&s=profile"><span><i class="fa fa-arrow-down"></i></span><span>Download</span></a><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="88404038"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span><span id="work-strip-rankings-button-container"></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="88404038"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 88404038; 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dispatcherData = { dispatcher: window.WowProfile.dispatcher, downloadLinkId: "5c188b42bf0c54942abdd9b1c765f1d2" } } $('.js-work-strip[data-work-id=88404038]').each(function() { if (!$(this).data('initialized')) { new WowProfile.WorkStripView({ el: this, workJSON: {"id":88404038,"title":"Subcooled boiling regime map for water at low saturation temperature and subatmospheric pressure","translated_title":"","metadata":{"publisher":"Elsevier BV","grobid_abstract":"Subatmospheric pool boiling heat transfer was investigated experimentally. At low vapor pressure, the static head of the liquid column induces a non-negligible pressure gradient. This results in a local pressure-induced subcooling that makes the case of boiling at low vapor pressure with a high level of liquid a particular case of subcooled boiling. The experiments were conducted for variety of working parameters: three vapor pressures (2.4 kPa, 3.1 kPa, 4.1 kPa), four levels of liquid (15 cm, 28 cm, 35 cm, 60 cm) and five applied heat fluxes (3.6 W • cm −2 , 4.4 W • cm −2 , 5.2 W • cm −2 , 6.1 W • cm −2 and 7.1 W • cm −2). Owing to a statistical analysis of the signal of a heat flux sensor coupled with high-speed video recording, four different boiling regimes were identified: the regime of convection or small popping bubbles, the regime of isolated bubbles, the regime of intermittent boiling and the regime of fully developed boiling. The small popping bubbles and the intermittent boiling regimes are specific to the low pressure boiling: they are governed by the phenomenon of condensation driven by the aforementioned static pressure induced subcooling. Finally, to provide a visual representation of the influence of the working parameters on the boiling behavior, a dimensionless boiling regime map was proposed. This type of representation is a tool to predict the boiling regimes from a set of operating conditions but it is also useful to interpret the physical phenomena involved and how they differ from those occurring at higher pressure. 1.1. Temperature-induced subcooled boiling Subcooled boiling was primarily studied in the case of temperatureinduced subcooling (liquid bulk temperature being lower than the","publication_date":{"day":null,"month":null,"year":2020,"errors":{}},"publication_name":"Experimental Thermal and Fluid Science","grobid_abstract_attachment_id":92382005},"translated_abstract":null,"internal_url":"https://www.academia.edu/88404038/Subcooled_boiling_regime_map_for_water_at_low_saturation_temperature_and_subatmospheric_pressure","translated_internal_url":"","created_at":"2022-10-13T05:03:30.057-07:00","preview_url":null,"current_user_can_edit":null,"current_user_is_owner":null,"owner_id":240164373,"coauthors_can_edit":true,"document_type":"paper","co_author_tags":[],"downloadable_attachments":[{"id":92382005,"title":"","file_type":"pdf","scribd_thumbnail_url":"https://attachments.academia-assets.com/92382005/thumbnails/1.jpg","file_name":"j.expthermflusci.2020.11015020221013-1-3qqdbi.pdf","download_url":"https://www.academia.edu/attachments/92382005/download_file?st=MTczMjgyNzE5Myw4LjIyMi4yMDguMTQ2&st=MTczMjgyNzE5Miw4LjIyMi4yMDguMTQ2&","bulk_download_file_name":"Subcooled_boiling_regime_map_for_water_a.pdf","bulk_download_url":"https://d1wqtxts1xzle7.cloudfront.net/92382005/j.expthermflusci.2020.11015020221013-1-3qqdbi-libre.pdf?1665662720=\u0026response-content-disposition=attachment%3B+filename%3DSubcooled_boiling_regime_map_for_water_a.pdf\u0026Expires=1732830792\u0026Signature=KlpkT-5Hvpe1qFcaLkSMOhAmLvHH5NRPHCNC9GenBIofgrN2~xZ-D1ym3bgRXWOT22e~KK0UlYNNOXrH6xm8z-3lrGaYsuQnXnf26K82LVbRUwOgqjrKvo-hmMcftcCfLPBIgbJbVc7TZ5LnYIbokqCSMW-Vpm3o7JSU0aHz2R-zl8gAT2PmOooSJSbT~Z5prnZJSTOM5k4V4Dola~PGBhOfK749NDTeUG0Pp15toEkVDfTnb7e2oPlKV2C-K7T2tXvEeK8rPPLz6iAmum94403Xn4pBC9qNYbYr7B8wBKUH6uetBvzRQTkHO5RpmPc1cV-Uk7PtH2kOYM8A5OVbow__\u0026Key-Pair-Id=APKAJLOHF5GGSLRBV4ZA"}],"slug":"Subcooled_boiling_regime_map_for_water_at_low_saturation_temperature_and_subatmospheric_pressure","translated_slug":"","page_count":11,"language":"en","content_type":"Work","owner":{"id":240164373,"first_name":"Bartosz","middle_initials":null,"last_name":"Zajaczkowski","page_name":"BartoszZajaczkowski","domain_name":"independent","created_at":"2022-10-13T05:00:14.997-07:00","display_name":"Bartosz Zajaczkowski","url":"https://independent.academia.edu/BartoszZajaczkowski"},"attachments":[{"id":92382005,"title":"","file_type":"pdf","scribd_thumbnail_url":"https://attachments.academia-assets.com/92382005/thumbnails/1.jpg","file_name":"j.expthermflusci.2020.11015020221013-1-3qqdbi.pdf","download_url":"https://www.academia.edu/attachments/92382005/download_file?st=MTczMjgyNzE5Myw4LjIyMi4yMDguMTQ2&st=MTczMjgyNzE5Miw4LjIyMi4yMDguMTQ2&","bulk_download_file_name":"Subcooled_boiling_regime_map_for_water_a.pdf","bulk_download_url":"https://d1wqtxts1xzle7.cloudfront.net/92382005/j.expthermflusci.2020.11015020221013-1-3qqdbi-libre.pdf?1665662720=\u0026response-content-disposition=attachment%3B+filename%3DSubcooled_boiling_regime_map_for_water_a.pdf\u0026Expires=1732830792\u0026Signature=KlpkT-5Hvpe1qFcaLkSMOhAmLvHH5NRPHCNC9GenBIofgrN2~xZ-D1ym3bgRXWOT22e~KK0UlYNNOXrH6xm8z-3lrGaYsuQnXnf26K82LVbRUwOgqjrKvo-hmMcftcCfLPBIgbJbVc7TZ5LnYIbokqCSMW-Vpm3o7JSU0aHz2R-zl8gAT2PmOooSJSbT~Z5prnZJSTOM5k4V4Dola~PGBhOfK749NDTeUG0Pp15toEkVDfTnb7e2oPlKV2C-K7T2tXvEeK8rPPLz6iAmum94403Xn4pBC9qNYbYr7B8wBKUH6uetBvzRQTkHO5RpmPc1cV-Uk7PtH2kOYM8A5OVbow__\u0026Key-Pair-Id=APKAJLOHF5GGSLRBV4ZA"}],"research_interests":[{"id":48,"name":"Engineering","url":"https://www.academia.edu/Documents/in/Engineering"},{"id":511,"name":"Materials Science","url":"https://www.academia.edu/Documents/in/Materials_Science"},{"id":522,"name":"Thermodynamics","url":"https://www.academia.edu/Documents/in/Thermodynamics"},{"id":152114,"name":"Bubble","url":"https://www.academia.edu/Documents/in/Bubble"},{"id":972442,"name":"Boiling","url":"https://www.academia.edu/Documents/in/Boiling"},{"id":1444999,"name":"Nucleate Boiling","url":"https://www.academia.edu/Documents/in/Nucleate_Boiling"},{"id":3156000,"name":"Subcooling","url":"https://www.academia.edu/Documents/in/Subcooling"}],"urls":[{"id":24729250,"url":"https://api.elsevier.com/content/article/PII:S0894177719321466?httpAccept=text/xml"}]}, dispatcherData: dispatcherData }); $(this).data('initialized', true); } }); $a.trackClickSource(".js-work-strip-work-link", "profile_work_strip") }); </script> <div class="js-work-strip profile--work_container" data-work-id="88404033"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" href="https://www.academia.edu/88404033/Impact_of_Silica_Nanofluid_Deposition_on_Thermosyphon_Performance"><img alt="Research paper thumbnail of Impact of Silica Nanofluid Deposition on Thermosyphon Performance" class="work-thumbnail" src="https://attachments.academia-assets.com/92382004/thumbnails/1.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" href="https://www.academia.edu/88404033/Impact_of_Silica_Nanofluid_Deposition_on_Thermosyphon_Performance">Impact of Silica Nanofluid Deposition on Thermosyphon Performance</a></div><div class="wp-workCard_item"><span>Heat Transfer Engineering</span><span>, 2020</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="40e6737ff3edffd85e7b87061dd35404" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":92382004,"asset_id":88404033,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/92382004/download_file?st=MTczMjgyNzE5Myw4LjIyMi4yMDguMTQ2&st=MTczMjgyNzE5Myw4LjIyMi4yMDguMTQ2&s=profile"><span><i class="fa fa-arrow-down"></i></span><span>Download</span></a><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="88404033"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span><span id="work-strip-rankings-button-container"></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="88404033"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 88404033; 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Due to heat and mass transfer limitations of working fluids, much effort is invested in developing a new generation of enhanced fluids, such as nanofluids. Previous studies reported improved thermal capacity when water was replaced by nanofluid. The interplay between nanoparticles and the evaporator surface is crucial here. However, the details of the deposition mechanism and its impact on boiling are still not known. This paper focusses on determining how the boiling process in the thermosyphon affects the inner wall of the evaporator and the nanofluid itself, and how it influences the thermal performance. For that purpose, we conducted the experimental study on a thermosyphon filled with silica nanofluid and then analyzed the samples of evaporator surface and silica nanofluid under a scanning electron microscope. Silica deposited into a porous layer during boiling, which enabled capillary wicking. This in turn decreased the overheating of the evaporator wall. Moreover, silica nanofluid increased heat transfer efficiency and transferred more thermal energy at low heat loads. After opening the thermosyphon, the deposited layer dried and split up. Based on two methods of crack pattern analysis, the mean thickness of the layer was estimated.","publication_date":{"day":null,"month":null,"year":2020,"errors":{}},"publication_name":"Heat Transfer Engineering","grobid_abstract_attachment_id":92382004},"translated_abstract":null,"internal_url":"https://www.academia.edu/88404033/Impact_of_Silica_Nanofluid_Deposition_on_Thermosyphon_Performance","translated_internal_url":"","created_at":"2022-10-13T05:03:29.838-07:00","preview_url":null,"current_user_can_edit":null,"current_user_is_owner":null,"owner_id":240164373,"coauthors_can_edit":true,"document_type":"paper","co_author_tags":[],"downloadable_attachments":[{"id":92382004,"title":"","file_type":"pdf","scribd_thumbnail_url":"https://attachments.academia-assets.com/92382004/thumbnails/1.jpg","file_name":"01457632.2020.181841320221013-1-f30c7f.pdf","download_url":"https://www.academia.edu/attachments/92382004/download_file?st=MTczMjgyNzE5Myw4LjIyMi4yMDguMTQ2&st=MTczMjgyNzE5Myw4LjIyMi4yMDguMTQ2&","bulk_download_file_name":"Impact_of_Silica_Nanofluid_Deposition_on.pdf","bulk_download_url":"https://d1wqtxts1xzle7.cloudfront.net/92382004/01457632.2020.181841320221013-1-f30c7f-libre.pdf?1665662734=\u0026response-content-disposition=attachment%3B+filename%3DImpact_of_Silica_Nanofluid_Deposition_on.pdf\u0026Expires=1732830792\u0026Signature=X4fIRTUx8pqWZm6A290j1b2TELe4TNxXk4bCnQ~BVVM3kgcVA8nklwcqgke1k8Yt8NBwLP4S1Y296B7I0Z2mecnV3kACx1qgKUQviNsYr2Go-Qf7nqVAtmH8wQTEK8X111oLjkQg8~LZXRj3y6S~psKVC2nAKO1HnwXBuBfMvJPQJ5YhkHA605v5XylFjI76qf3YoS~cCyOcOuElad03GrXIc~6UseON-NNUZfC7DNZTWTvCumLS4BAamz2vq~CcnR4gD0Zp-pgnLMeU4ZTcUD-uqPpaJB1b4agibICHQcV1J3BOAS4FXkGJRDvVGH0mPyMIpZ5X3q2TuA4xE0e3Tg__\u0026Key-Pair-Id=APKAJLOHF5GGSLRBV4ZA"}],"slug":"Impact_of_Silica_Nanofluid_Deposition_on_Thermosyphon_Performance","translated_slug":"","page_count":50,"language":"en","content_type":"Work","owner":{"id":240164373,"first_name":"Bartosz","middle_initials":null,"last_name":"Zajaczkowski","page_name":"BartoszZajaczkowski","domain_name":"independent","created_at":"2022-10-13T05:00:14.997-07:00","display_name":"Bartosz Zajaczkowski","url":"https://independent.academia.edu/BartoszZajaczkowski"},"attachments":[{"id":92382004,"title":"","file_type":"pdf","scribd_thumbnail_url":"https://attachments.academia-assets.com/92382004/thumbnails/1.jpg","file_name":"01457632.2020.181841320221013-1-f30c7f.pdf","download_url":"https://www.academia.edu/attachments/92382004/download_file?st=MTczMjgyNzE5Myw4LjIyMi4yMDguMTQ2&st=MTczMjgyNzE5Myw4LjIyMi4yMDguMTQ2&","bulk_download_file_name":"Impact_of_Silica_Nanofluid_Deposition_on.pdf","bulk_download_url":"https://d1wqtxts1xzle7.cloudfront.net/92382004/01457632.2020.181841320221013-1-f30c7f-libre.pdf?1665662734=\u0026response-content-disposition=attachment%3B+filename%3DImpact_of_Silica_Nanofluid_Deposition_on.pdf\u0026Expires=1732830792\u0026Signature=X4fIRTUx8pqWZm6A290j1b2TELe4TNxXk4bCnQ~BVVM3kgcVA8nklwcqgke1k8Yt8NBwLP4S1Y296B7I0Z2mecnV3kACx1qgKUQviNsYr2Go-Qf7nqVAtmH8wQTEK8X111oLjkQg8~LZXRj3y6S~psKVC2nAKO1HnwXBuBfMvJPQJ5YhkHA605v5XylFjI76qf3YoS~cCyOcOuElad03GrXIc~6UseON-NNUZfC7DNZTWTvCumLS4BAamz2vq~CcnR4gD0Zp-pgnLMeU4ZTcUD-uqPpaJB1b4agibICHQcV1J3BOAS4FXkGJRDvVGH0mPyMIpZ5X3q2TuA4xE0e3Tg__\u0026Key-Pair-Id=APKAJLOHF5GGSLRBV4ZA"}],"research_interests":[{"id":60,"name":"Mechanical Engineering","url":"https://www.academia.edu/Documents/in/Mechanical_Engineering"},{"id":305,"name":"Applied Mathematics","url":"https://www.academia.edu/Documents/in/Applied_Mathematics"},{"id":511,"name":"Materials Science","url":"https://www.academia.edu/Documents/in/Materials_Science"},{"id":144723,"name":"Nanofluid","url":"https://www.academia.edu/Documents/in/Nanofluid"},{"id":1340630,"name":"Chemical Engineering Heat \u0026 Mass Transfer","url":"https://www.academia.edu/Documents/in/Chemical_Engineering_Heat_and_Mass_Transfer"},{"id":1524533,"name":"Mechanical Engineering and heat and mass transfer","url":"https://www.academia.edu/Documents/in/Mechanical_Engineering_and_heat_and_mass_transfer"}],"urls":[{"id":24729247,"url":"https://www.tandfonline.com/doi/pdf/10.1080/01457632.2020.1818413"}]}, dispatcherData: dispatcherData }); $(this).data('initialized', true); } }); $a.trackClickSource(".js-work-strip-work-link", "profile_work_strip") }); </script> <div class="js-work-strip profile--work_container" data-work-id="88404029"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" href="https://www.academia.edu/88404029/The_effect_of_boiling_in_a_thermosyphon_on_surface_tension_and_contact_angle_of_silica_and_graphene_oxide_nanofluids"><img alt="Research paper thumbnail of The effect of boiling in a thermosyphon on surface tension and contact angle of silica and graphene oxide nanofluids" class="work-thumbnail" src="https://a.academia-assets.com/images/blank-paper.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" href="https://www.academia.edu/88404029/The_effect_of_boiling_in_a_thermosyphon_on_surface_tension_and_contact_angle_of_silica_and_graphene_oxide_nanofluids">The effect of boiling in a thermosyphon on surface tension and contact angle of silica and graphene oxide nanofluids</a></div><div class="wp-workCard_item"><span>Colloids and Surfaces A: Physicochemical and Engineering Aspects</span><span>, 2021</span></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">Abstract Thermosyphons are heat transfer devices characterised by high efficiency due to simultan...</span><a class="js-work-more-abstract" data-broccoli-component="work_strip.more_abstract" data-click-track="profile-work-strip-more-abstract" href="javascript:;"><span> more </span><span><i class="fa fa-caret-down"></i></span></a><span class="js-work-more-abstract-untruncated hidden">Abstract Thermosyphons are heat transfer devices characterised by high efficiency due to simultaneous phase changes occurring in the evaporation-condensation cycle of working fluid. One of the most promising solutions to enhance their heat transfer capacity of the device is the use of nanofluids – suspensions of particles with at least one dimension below 100 nm. It was determined that nanofluid does not influence the work of thermosyphons condenser section and the focus should be put on the boiling process in the evaporator section. During boiling, nanoparticles tend to deposit on the heater’s surface, what alters characteristics of this surface and near surface hydrodynamics. This changes the appearance of nanofluid, but the precise effect on how the deposition of particles affects the properties of nanofluid is unknown. Changes in surface tension and wettability affect boiling regimes (e.g. reduced surface tension reduces the size of departing bubbles and inhibits geysering), and efficiency of heat transfer through the device. Understanding of those parameters is crucial for the development of appropriate models describing heat transfer in thermosyphon working with nanofluids. The main goal of this study is to determine surface tension and contact angle of nanofluids based on silica nanoparticles and nano-sized graphene oxide flakes before and after the experimental boiling cycle in the thermosyphon. Results show that, in comparison with water, silica nanofluid (2 vol%) is characterised by lower surface tension and contact angles on both analysed surfaces. After-use silica nanofluid exhibited noticeably higher averaged surface tension and smaller contact angles in comparison to the fresh working medium. The change was most likely due to the decreased concentration caused by the deposition of nanoparticles during the thermosyphon operation. Still, the differences between before-use and after-use samples were smaller than the measurement uncertainties. Before-use graphene oxide nanofluid already showed surface tension and contact angle similar to water due to low concentration of graphene flakes (0.1 g/L). Consequently, the properties of after-use graphene oxide fluid were also not much different from water. Additional measurements of surface tension for graphene oxide nanofluid with and without addition of sodium dodecyl sulphate surfactant allowed to differentiate the effects caused by graphene flakes and surfactant. The surfactant reduced the surface tension of the nanofluid, but the change was smaller than in case of surfactant addition to pure water.</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="88404029"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span><span id="work-strip-rankings-button-container"></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="88404029"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 88404029; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); $(".js-view-count[data-work-id=88404029]").text(description); $(".js-view-count[data-work-id=88404029]").attr('title', description).tooltip(); }); });</script></span></span><span><span class="percentile-widget hidden"><span class="u-mr2x work-percentile"></span></span><script>$(function () { var workId = 88404029; window.Academia.workPercentilesFetcher.queue(workId, function (percentileText) { var container = $(".js-work-strip[data-work-id='88404029']"); container.find('.work-percentile').text(percentileText.charAt(0).toUpperCase() + percentileText.slice(1)); container.find('.percentile-widget').show(); container.find('.percentile-widget').removeClass('hidden'); }); });</script></span><span><script>$(function() { new Works.PaperRankView({ workId: 88404029, container: "", }); });</script></span></div><div id="work-strip-premium-row-container"></div></div></div><script> require.config({ waitSeconds: 90 })(["https://a.academia-assets.com/assets/wow_profile-f77ea15d77ce96025a6048a514272ad8becbad23c641fc2b3bd6e24ca6ff1932.js","https://a.academia-assets.com/assets/work_edit-ad038b8c047c1a8d4fa01b402d530ff93c45fee2137a149a4a5398bc8ad67560.js"], function() { // from javascript_helper.rb var dispatcherData = {} if (false){ window.WowProfile.dispatcher = window.WowProfile.dispatcher || _.clone(Backbone.Events); dispatcherData = { dispatcher: window.WowProfile.dispatcher, downloadLinkId: "-1" } } $('.js-work-strip[data-work-id=88404029]').each(function() { if (!$(this).data('initialized')) { new WowProfile.WorkStripView({ el: this, workJSON: {"id":88404029,"title":"The effect of boiling in a thermosyphon on surface tension and contact angle of silica and graphene oxide nanofluids","translated_title":"","metadata":{"abstract":"Abstract Thermosyphons are heat transfer devices characterised by high efficiency due to simultaneous phase changes occurring in the evaporation-condensation cycle of working fluid. One of the most promising solutions to enhance their heat transfer capacity of the device is the use of nanofluids – suspensions of particles with at least one dimension below 100 nm. It was determined that nanofluid does not influence the work of thermosyphons condenser section and the focus should be put on the boiling process in the evaporator section. During boiling, nanoparticles tend to deposit on the heater’s surface, what alters characteristics of this surface and near surface hydrodynamics. This changes the appearance of nanofluid, but the precise effect on how the deposition of particles affects the properties of nanofluid is unknown. Changes in surface tension and wettability affect boiling regimes (e.g. reduced surface tension reduces the size of departing bubbles and inhibits geysering), and efficiency of heat transfer through the device. Understanding of those parameters is crucial for the development of appropriate models describing heat transfer in thermosyphon working with nanofluids. The main goal of this study is to determine surface tension and contact angle of nanofluids based on silica nanoparticles and nano-sized graphene oxide flakes before and after the experimental boiling cycle in the thermosyphon. Results show that, in comparison with water, silica nanofluid (2 vol%) is characterised by lower surface tension and contact angles on both analysed surfaces. After-use silica nanofluid exhibited noticeably higher averaged surface tension and smaller contact angles in comparison to the fresh working medium. The change was most likely due to the decreased concentration caused by the deposition of nanoparticles during the thermosyphon operation. Still, the differences between before-use and after-use samples were smaller than the measurement uncertainties. Before-use graphene oxide nanofluid already showed surface tension and contact angle similar to water due to low concentration of graphene flakes (0.1 g/L). Consequently, the properties of after-use graphene oxide fluid were also not much different from water. Additional measurements of surface tension for graphene oxide nanofluid with and without addition of sodium dodecyl sulphate surfactant allowed to differentiate the effects caused by graphene flakes and surfactant. The surfactant reduced the surface tension of the nanofluid, but the change was smaller than in case of surfactant addition to pure water.","publisher":"Elsevier BV","publication_date":{"day":null,"month":null,"year":2021,"errors":{}},"publication_name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects"},"translated_abstract":"Abstract Thermosyphons are heat transfer devices characterised by high efficiency due to simultaneous phase changes occurring in the evaporation-condensation cycle of working fluid. One of the most promising solutions to enhance their heat transfer capacity of the device is the use of nanofluids – suspensions of particles with at least one dimension below 100 nm. It was determined that nanofluid does not influence the work of thermosyphons condenser section and the focus should be put on the boiling process in the evaporator section. During boiling, nanoparticles tend to deposit on the heater’s surface, what alters characteristics of this surface and near surface hydrodynamics. This changes the appearance of nanofluid, but the precise effect on how the deposition of particles affects the properties of nanofluid is unknown. Changes in surface tension and wettability affect boiling regimes (e.g. reduced surface tension reduces the size of departing bubbles and inhibits geysering), and efficiency of heat transfer through the device. Understanding of those parameters is crucial for the development of appropriate models describing heat transfer in thermosyphon working with nanofluids. The main goal of this study is to determine surface tension and contact angle of nanofluids based on silica nanoparticles and nano-sized graphene oxide flakes before and after the experimental boiling cycle in the thermosyphon. Results show that, in comparison with water, silica nanofluid (2 vol%) is characterised by lower surface tension and contact angles on both analysed surfaces. After-use silica nanofluid exhibited noticeably higher averaged surface tension and smaller contact angles in comparison to the fresh working medium. The change was most likely due to the decreased concentration caused by the deposition of nanoparticles during the thermosyphon operation. Still, the differences between before-use and after-use samples were smaller than the measurement uncertainties. Before-use graphene oxide nanofluid already showed surface tension and contact angle similar to water due to low concentration of graphene flakes (0.1 g/L). Consequently, the properties of after-use graphene oxide fluid were also not much different from water. Additional measurements of surface tension for graphene oxide nanofluid with and without addition of sodium dodecyl sulphate surfactant allowed to differentiate the effects caused by graphene flakes and surfactant. The surfactant reduced the surface tension of the nanofluid, but the change was smaller than in case of surfactant addition to pure water.","internal_url":"https://www.academia.edu/88404029/The_effect_of_boiling_in_a_thermosyphon_on_surface_tension_and_contact_angle_of_silica_and_graphene_oxide_nanofluids","translated_internal_url":"","created_at":"2022-10-13T05:03:29.625-07:00","preview_url":null,"current_user_can_edit":null,"current_user_is_owner":null,"owner_id":240164373,"coauthors_can_edit":true,"document_type":"paper","co_author_tags":[],"downloadable_attachments":[],"slug":"The_effect_of_boiling_in_a_thermosyphon_on_surface_tension_and_contact_angle_of_silica_and_graphene_oxide_nanofluids","translated_slug":"","page_count":null,"language":"en","content_type":"Work","owner":{"id":240164373,"first_name":"Bartosz","middle_initials":null,"last_name":"Zajaczkowski","page_name":"BartoszZajaczkowski","domain_name":"independent","created_at":"2022-10-13T05:00:14.997-07:00","display_name":"Bartosz Zajaczkowski","url":"https://independent.academia.edu/BartoszZajaczkowski"},"attachments":[],"research_interests":[{"id":48,"name":"Engineering","url":"https://www.academia.edu/Documents/in/Engineering"},{"id":511,"name":"Materials Science","url":"https://www.academia.edu/Documents/in/Materials_Science"},{"id":8067,"name":"Heat Transfer","url":"https://www.academia.edu/Documents/in/Heat_Transfer"},{"id":118582,"name":"Physical sciences","url":"https://www.academia.edu/Documents/in/Physical_sciences"},{"id":144723,"name":"Nanofluid","url":"https://www.academia.edu/Documents/in/Nanofluid"},{"id":161126,"name":"Contact angle","url":"https://www.academia.edu/Documents/in/Contact_angle"},{"id":211877,"name":"Wetting","url":"https://www.academia.edu/Documents/in/Wetting"},{"id":260118,"name":"CHEMICAL SCIENCES","url":"https://www.academia.edu/Documents/in/CHEMICAL_SCIENCES"},{"id":394521,"name":"Surface Tension","url":"https://www.academia.edu/Documents/in/Surface_Tension"},{"id":972442,"name":"Boiling","url":"https://www.academia.edu/Documents/in/Boiling"}],"urls":[{"id":24729243,"url":"https://api.elsevier.com/content/article/PII:S0927775721009511?httpAccept=text/xml"}]}, dispatcherData: dispatcherData }); $(this).data('initialized', true); } }); $a.trackClickSource(".js-work-strip-work-link", "profile_work_strip") }); </script> <div class="js-work-strip profile--work_container" data-work-id="88404024"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" href="https://www.academia.edu/88404024/Pool_boiling_heat_transfer_coefficient_of_dimethyl_ether_and_its_azeotropic_ternary_mixtures"><img alt="Research paper thumbnail of Pool boiling heat transfer coefficient of dimethyl ether and its azeotropic ternary mixtures" class="work-thumbnail" src="https://a.academia-assets.com/images/blank-paper.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" href="https://www.academia.edu/88404024/Pool_boiling_heat_transfer_coefficient_of_dimethyl_ether_and_its_azeotropic_ternary_mixtures">Pool boiling heat transfer coefficient of dimethyl ether and its azeotropic ternary mixtures</a></div><div class="wp-workCard_item"><span>International Journal of Heat and Mass Transfer</span><span>, 2021</span></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">Abstract Dimethyl ether (DME) is a popular medium widely used in industrial applications. Being h...</span><a class="js-work-more-abstract" data-broccoli-component="work_strip.more_abstract" data-click-track="profile-work-strip-more-abstract" href="javascript:;"><span> more </span><span><i class="fa fa-caret-down"></i></span></a><span class="js-work-more-abstract-untruncated hidden">Abstract Dimethyl ether (DME) is a popular medium widely used in industrial applications. Being highly flammable substance, only recently it has again found commercial use as a primary working fluid in cooling and heating systems. Known as refrigerant RE170, it is now considered to be one of the potential natural refrigerants of the future due to minimal Global Warming Potential and zero Ozone Depletion Potential. Two novel azeotropic ternary mixtures of RE170/R1234yf/R152a were developed in order to improve cooling capacity and performance of a dimethyl ether refrigeration cycle. The mass ratios were purposefully selected to offer high cycle efficiency COP, high specific cooling capacity q e , small specific volume of vapour, reduced compressor power requirements, and the smallest possible temperature glide. The mixtures were subjected to experimental analysis in order to establish to what degree the added fluids (R1234yf and R152a) influence boiling and heat transfer performance. Boiling curves and heat transfer coefficients were determined experimentally and compared with the values obtained for pure RE170. Finally, several known heat transfer coefficient correlations (suitable for both hydrocarbons and synthetic refrigerants) were applied to the resulting data and evaluated for accuracy by evaluation of MAPE. The Cooper correlation was the most accurate for for ternary mixtures of dimethyl ether in the broadest range of temperatures, heat fluxes, and compositions (MAPE between 3.5-19.8). In order to improve the accuracy even further, the original Cooper correlation was modified with the acentric factor and the molecular mass power factor was optimised for modern chloride-less refrigerants. Resulting equation, when applied to ternary mixtures, returns errors below 5% in the entire range of experimental data.</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="88404024"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span><span id="work-strip-rankings-button-container"></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="88404024"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 88404024; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); $(".js-view-count[data-work-id=88404024]").text(description); $(".js-view-count[data-work-id=88404024]").attr('title', description).tooltip(); }); });</script></span></span><span><span class="percentile-widget hidden"><span class="u-mr2x work-percentile"></span></span><script>$(function () { var workId = 88404024; window.Academia.workPercentilesFetcher.queue(workId, function (percentileText) { var container = $(".js-work-strip[data-work-id='88404024']"); container.find('.work-percentile').text(percentileText.charAt(0).toUpperCase() + percentileText.slice(1)); container.find('.percentile-widget').show(); container.find('.percentile-widget').removeClass('hidden'); }); });</script></span><span><script>$(function() { new Works.PaperRankView({ workId: 88404024, container: "", }); });</script></span></div><div id="work-strip-premium-row-container"></div></div></div><script> require.config({ waitSeconds: 90 })(["https://a.academia-assets.com/assets/wow_profile-f77ea15d77ce96025a6048a514272ad8becbad23c641fc2b3bd6e24ca6ff1932.js","https://a.academia-assets.com/assets/work_edit-ad038b8c047c1a8d4fa01b402d530ff93c45fee2137a149a4a5398bc8ad67560.js"], function() { // from javascript_helper.rb var dispatcherData = {} if (false){ window.WowProfile.dispatcher = window.WowProfile.dispatcher || _.clone(Backbone.Events); dispatcherData = { dispatcher: window.WowProfile.dispatcher, downloadLinkId: "-1" } } $('.js-work-strip[data-work-id=88404024]').each(function() { if (!$(this).data('initialized')) { new WowProfile.WorkStripView({ el: this, workJSON: {"id":88404024,"title":"Pool boiling heat transfer coefficient of dimethyl ether and its azeotropic ternary mixtures","translated_title":"","metadata":{"abstract":"Abstract Dimethyl ether (DME) is a popular medium widely used in industrial applications. Being highly flammable substance, only recently it has again found commercial use as a primary working fluid in cooling and heating systems. Known as refrigerant RE170, it is now considered to be one of the potential natural refrigerants of the future due to minimal Global Warming Potential and zero Ozone Depletion Potential. Two novel azeotropic ternary mixtures of RE170/R1234yf/R152a were developed in order to improve cooling capacity and performance of a dimethyl ether refrigeration cycle. The mass ratios were purposefully selected to offer high cycle efficiency COP, high specific cooling capacity q e , small specific volume of vapour, reduced compressor power requirements, and the smallest possible temperature glide. The mixtures were subjected to experimental analysis in order to establish to what degree the added fluids (R1234yf and R152a) influence boiling and heat transfer performance. Boiling curves and heat transfer coefficients were determined experimentally and compared with the values obtained for pure RE170. Finally, several known heat transfer coefficient correlations (suitable for both hydrocarbons and synthetic refrigerants) were applied to the resulting data and evaluated for accuracy by evaluation of MAPE. The Cooper correlation was the most accurate for for ternary mixtures of dimethyl ether in the broadest range of temperatures, heat fluxes, and compositions (MAPE between 3.5-19.8). In order to improve the accuracy even further, the original Cooper correlation was modified with the acentric factor and the molecular mass power factor was optimised for modern chloride-less refrigerants. Resulting equation, when applied to ternary mixtures, returns errors below 5% in the entire range of experimental data.","publisher":"Elsevier BV","publication_date":{"day":null,"month":null,"year":2021,"errors":{}},"publication_name":"International Journal of Heat and Mass Transfer"},"translated_abstract":"Abstract Dimethyl ether (DME) is a popular medium widely used in industrial applications. Being highly flammable substance, only recently it has again found commercial use as a primary working fluid in cooling and heating systems. Known as refrigerant RE170, it is now considered to be one of the potential natural refrigerants of the future due to minimal Global Warming Potential and zero Ozone Depletion Potential. Two novel azeotropic ternary mixtures of RE170/R1234yf/R152a were developed in order to improve cooling capacity and performance of a dimethyl ether refrigeration cycle. The mass ratios were purposefully selected to offer high cycle efficiency COP, high specific cooling capacity q e , small specific volume of vapour, reduced compressor power requirements, and the smallest possible temperature glide. The mixtures were subjected to experimental analysis in order to establish to what degree the added fluids (R1234yf and R152a) influence boiling and heat transfer performance. Boiling curves and heat transfer coefficients were determined experimentally and compared with the values obtained for pure RE170. Finally, several known heat transfer coefficient correlations (suitable for both hydrocarbons and synthetic refrigerants) were applied to the resulting data and evaluated for accuracy by evaluation of MAPE. The Cooper correlation was the most accurate for for ternary mixtures of dimethyl ether in the broadest range of temperatures, heat fluxes, and compositions (MAPE between 3.5-19.8). In order to improve the accuracy even further, the original Cooper correlation was modified with the acentric factor and the molecular mass power factor was optimised for modern chloride-less refrigerants. Resulting equation, when applied to ternary mixtures, returns errors below 5% in the entire range of experimental data.","internal_url":"https://www.academia.edu/88404024/Pool_boiling_heat_transfer_coefficient_of_dimethyl_ether_and_its_azeotropic_ternary_mixtures","translated_internal_url":"","created_at":"2022-10-13T05:03:29.404-07:00","preview_url":null,"current_user_can_edit":null,"current_user_is_owner":null,"owner_id":240164373,"coauthors_can_edit":true,"document_type":"paper","co_author_tags":[],"downloadable_attachments":[],"slug":"Pool_boiling_heat_transfer_coefficient_of_dimethyl_ether_and_its_azeotropic_ternary_mixtures","translated_slug":"","page_count":null,"language":"en","content_type":"Work","owner":{"id":240164373,"first_name":"Bartosz","middle_initials":null,"last_name":"Zajaczkowski","page_name":"BartoszZajaczkowski","domain_name":"independent","created_at":"2022-10-13T05:00:14.997-07:00","display_name":"Bartosz Zajaczkowski","url":"https://independent.academia.edu/BartoszZajaczkowski"},"attachments":[],"research_interests":[{"id":48,"name":"Engineering","url":"https://www.academia.edu/Documents/in/Engineering"},{"id":511,"name":"Materials Science","url":"https://www.academia.edu/Documents/in/Materials_Science"},{"id":522,"name":"Thermodynamics","url":"https://www.academia.edu/Documents/in/Thermodynamics"},{"id":33661,"name":"Heat and Mass Transfer","url":"https://www.academia.edu/Documents/in/Heat_and_Mass_Transfer"},{"id":80414,"name":"Mathematical Sciences","url":"https://www.academia.edu/Documents/in/Mathematical_Sciences"},{"id":118582,"name":"Physical sciences","url":"https://www.academia.edu/Documents/in/Physical_sciences"}],"urls":[{"id":24729240,"url":"https://api.elsevier.com/content/article/PII:S0017931021001666?httpAccept=text/xml"}]}, dispatcherData: dispatcherData }); $(this).data('initialized', true); } }); $a.trackClickSource(".js-work-strip-work-link", "profile_work_strip") }); </script> <div class="js-work-strip profile--work_container" data-work-id="88404021"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" href="https://www.academia.edu/88404021/Influence_of_saturation_temperature_and_heat_flux_on_pool_boiling_of_R245fa"><img alt="Research paper thumbnail of Influence of saturation temperature and heat flux on pool boiling of R245fa" class="work-thumbnail" src="https://attachments.academia-assets.com/92381997/thumbnails/1.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" href="https://www.academia.edu/88404021/Influence_of_saturation_temperature_and_heat_flux_on_pool_boiling_of_R245fa">Influence of saturation temperature and heat flux on pool boiling of R245fa</a></div><div class="wp-workCard_item"><span>Experimental Heat Transfer</span><span>, 2020</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="4496443fdc70ee041d92d3611116a875" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":92381997,"asset_id":88404021,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/92381997/download_file?st=MTczMjgyNzE5Myw4LjIyMi4yMDguMTQ2&st=MTczMjgyNzE5Myw4LjIyMi4yMDguMTQ2&s=profile"><span><i class="fa fa-arrow-down"></i></span><span>Download</span></a><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="88404021"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span><span id="work-strip-rankings-button-container"></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="88404021"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 88404021; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); $(".js-view-count[data-work-id=88404021]").text(description); $(".js-view-count[data-work-id=88404021]").attr('title', description).tooltip(); }); });</script></span></span><span><span class="percentile-widget hidden"><span class="u-mr2x work-percentile"></span></span><script>$(function () { var workId = 88404021; window.Academia.workPercentilesFetcher.queue(workId, function (percentileText) { var container = $(".js-work-strip[data-work-id='88404021']"); container.find('.work-percentile').text(percentileText.charAt(0).toUpperCase() + percentileText.slice(1)); container.find('.percentile-widget').show(); container.find('.percentile-widget').removeClass('hidden'); }); });</script></span><span><script>$(function() { new Works.PaperRankView({ workId: 88404021, container: "", }); });</script></span></div><div id="work-strip-premium-row-container"></div></div></div><script> require.config({ waitSeconds: 90 })(["https://a.academia-assets.com/assets/wow_profile-f77ea15d77ce96025a6048a514272ad8becbad23c641fc2b3bd6e24ca6ff1932.js","https://a.academia-assets.com/assets/work_edit-ad038b8c047c1a8d4fa01b402d530ff93c45fee2137a149a4a5398bc8ad67560.js"], function() { // from javascript_helper.rb var dispatcherData = {} if (true){ window.WowProfile.dispatcher = window.WowProfile.dispatcher || _.clone(Backbone.Events); dispatcherData = { dispatcher: window.WowProfile.dispatcher, downloadLinkId: "4496443fdc70ee041d92d3611116a875" } } $('.js-work-strip[data-work-id=88404021]').each(function() { if (!$(this).data('initialized')) { new WowProfile.WorkStripView({ el: this, workJSON: {"id":88404021,"title":"Influence of saturation temperature and heat flux on pool boiling of R245fa","translated_title":"","metadata":{"publisher":"Informa UK Limited","grobid_abstract":"Low-pressure refrigerants such as R245fa allow compact design of IT cooling systems intended for harsh environments. Nucleate boiling of R245fa on an electrically heated flat horizontal surface was experimentally studied. Heat fluxes q w were 30-65 kW=m 2 and saturation temperatures 40-70 � C. Results show that the heat-transfer coefficient HTC increases with both heat flux and temperature, and that higher heat fluxes/temperatures lessen the HTC dependence on temperature/heat flux. For instance, increasing temperature from 40 to 70 � C translates into change of the exponent n in the HTC / q n w from 0.60 to 0.50. Therefore, pool-boiling correlations employing n ¼ const do not accurately reflect the HTC / q n w dependence. Comparing the experimental data with nucleate boiling correlations showed that the models of Kruzhilin and Mostinski were the most accurate with the Mean Absolute Percentage Error MAPE equal to 16.6% and 32.9%, respectively. The data were then used to optimize the model of Rohsenow and increase its accuracy. This model was chosen for optimization as it is the only model among the analyzed in this paper which incorporates a description of both surface roughness and contact angle. These properties are addressed using an empirical parameter C sf. Optimizing this parameter allowed the characterization of the interface between R245fa and heating surface used in this study. 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