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An" /> <meta name="twitter:image" content="http://a.academia-assets.com/images/twitter-card.jpeg" /> <meta property="fb:app_id" content="2369844204" /> <meta property="og:type" content="article" /> <meta property="og:url" content="https://www.academia.edu/109375386/Analysis_of_the_Flow_Induced_by_Air_Bubble_Systems" /> <meta property="og:title" content="Analysis of the Flow Induced by Air-Bubble Systems" /> <meta property="og:image" content="http://a.academia-assets.com/images/open-graph-icons/fb-paper.gif" /> <meta property="og:description" content="The pattern of vertical velocities induced by an orifice discharging air into water can be represented by Gaussian distribution curves with a linear spread in the vertical except for the regions near the orifice and close to the free surface. 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An analytical treatment considering the momentum-flux increase due to the buoyancy of the air together with experimental information about the spread of the velocity profiles and the mean rising speed of the air bubble stream, which has been obtained from velocity and density measurements over a wide range of conditions, leads to a complete description of the flow field. The ratio of the water volume flux to the air discharge rate, which has been proposed as an efficiency criterion, is now at hand as a function of depth and air supply for both single orifices and rows. The experimental evidence supports the analysis well and suggests that extrapolation to larger water depths and air supplies should be permissible, which would allow approximate ...","author":[{"@context":"https://schema.org","@type":"Person","name":"Helmut Kobus","url":"https://independent.academia.edu/HelmutKobus"}],"contributor":[],"dateCreated":"2023-11-19","datePublished":"1968-01-01","headline":"Analysis of the Flow Induced by Air-Bubble Systems","image":"https://attachments.academia-assets.com/107519934/thumbnails/1.jpg","inLanguage":"en","keywords":["Mechanics","Chemistry","Coastal Engineering","Bubble","Buoyancy","Extrapolation"],"publication":"Coastal Engineering Proceedings","publisher":{"@context":"https://schema.org","@type":"Organization","name":"Coastal Engineering Research 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{"work":{"id":109375386,"created_at":"2023-11-19T01:31:52.990-08:00","from_world_paper_id":243476026,"updated_at":"2023-11-28T10:41:09.185-08:00","_data":{"abstract":"The pattern of vertical velocities induced by an orifice discharging air into water can be represented by Gaussian distribution curves with a linear spread in the vertical except for the regions near the orifice and close to the free surface. An analytical treatment considering the momentum-flux increase due to the buoyancy of the air together with experimental information about the spread of the velocity profiles and the mean rising speed of the air bubble stream, which has been obtained from velocity and density measurements over a wide range of conditions, leads to a complete description of the flow field. The ratio of the water volume flux to the air discharge rate, which has been proposed as an efficiency criterion, is now at hand as a function of depth and air supply for both single orifices and rows. The experimental evidence supports the analysis well and suggests that extrapolation to larger water depths and air supplies should be permissible, which would allow approximate ...","publisher":"Coastal Engineering Research Council","publication_date":"1968,,","publication_name":"Coastal Engineering Proceedings"},"document_type":"paper","pre_hit_view_count_baseline":null,"quality":"high","language":"en","title":"Analysis of the Flow Induced by Air-Bubble Systems","broadcastable":true,"draft":null,"has_indexable_attachment":true,"indexable":true}}["work"]; window.loswp.workCoauthors = [38654381]; window.loswp.locale = "en"; window.loswp.countryCode = "SG"; window.loswp.cwvAbTestBucket = ""; window.loswp.designVariant = "ds_vanilla"; window.loswp.fullPageMobileSutdModalVariant = "full_page_mobile_sutd_modal"; window.loswp.useOptimizedScribd4genScript = false; window.loginModal = {}; window.loginModal.appleClientId = 'edu.academia.applesignon'; window.userInChina = "false";</script><script defer="" src="https://accounts.google.com/gsi/client"></script><div class="ds-loswp-container"><div class="ds-work-card--grid-container"><div class="ds-work-card--container js-loswp-work-card"><div class="ds-work-card--cover"><div class="ds-work-cover--wrapper"><div class="ds-work-cover--container"><button class="ds-work-cover--clickable js-swp-download-button" data-signup-modal="{"location":"swp-splash-paper-cover","attachmentId":107519934,"attachmentType":"pdf"}"><img alt="First page of “Analysis of the Flow Induced by Air-Bubble Systems”" class="ds-work-cover--cover-thumbnail" src="https://0.academia-photos.com/attachment_thumbnails/107519934/mini_magick20231119-1-3sb1vu.png?1700386381" /><img alt="PDF Icon" class="ds-work-cover--file-icon" src="//a.academia-assets.com/images/single_work_splash/adobe_icon.svg" /><div class="ds-work-cover--hover-container"><span class="material-symbols-outlined" style="font-size: 20px" translate="no">download</span><p>Download Free PDF</p></div><div class="ds-work-cover--ribbon-container">Download Free PDF</div><div class="ds-work-cover--ribbon-triangle"></div></button></div></div></div><div class="ds-work-card--work-information"><h1 class="ds-work-card--work-title">Analysis of the Flow Induced by Air-Bubble Systems</h1><div class="ds-work-card--work-authors ds-work-card--detail"><a class="ds-work-card--author js-wsj-grid-card-author ds2-5-body-md ds2-5-body-link" data-author-id="38654381" href="https://independent.academia.edu/HelmutKobus"><img alt="Profile image of Helmut Kobus" class="ds-work-card--author-avatar" src="//a.academia-assets.com/images/s65_no_pic.png" />Helmut Kobus</a></div><div class="ds-work-card--detail"><p class="ds-work-card--detail ds2-5-body-sm">1968, Coastal Engineering Proceedings</p><div class="ds-work-card--work-metadata"><div class="ds-work-card--work-metadata__stat"><span class="material-symbols-outlined" style="font-size: 20px" translate="no">visibility</span><p class="ds2-5-body-sm" id="work-metadata-view-count">…</p></div><div class="ds-work-card--work-metadata__stat"><span class="material-symbols-outlined" style="font-size: 20px" translate="no">description</span><p class="ds2-5-body-sm">16 pages</p></div><div class="ds-work-card--work-metadata__stat"><span class="material-symbols-outlined" style="font-size: 20px" translate="no">link</span><p class="ds2-5-body-sm">1 file</p></div></div><script>(async () => { const workId = 109375386; 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An analytical treatment considering the momentum-flux increase due to the buoyancy of the air together with experimental information about the spread of the velocity profiles and the mean rising speed of the air bubble stream, which has been obtained from velocity and density measurements over a wide range of conditions, leads to a complete description of the flow field. The ratio of the water volume flux to the air discharge rate, which has been proposed as an efficiency criterion, is now at hand as a function of depth and air supply for both single orifices and rows. The experimental evidence supports the analysis well and suggests that extrapolation to larger water depths and air supplies should be permissible, which would allow approximate ...</p><div class="ds-work-card--button-container"><button class="ds2-5-button js-swp-download-button" data-signup-modal="{"location":"continue-reading-button--work-card","attachmentId":107519934,"attachmentType":"pdf","workUrl":"https://www.academia.edu/109375386/Analysis_of_the_Flow_Induced_by_Air_Bubble_Systems"}">See full PDF</button><button class="ds2-5-button ds2-5-button--secondary js-swp-download-button" data-signup-modal="{"location":"download-pdf-button--work-card","attachmentId":107519934,"attachmentType":"pdf","workUrl":"https://www.academia.edu/109375386/Analysis_of_the_Flow_Induced_by_Air_Bubble_Systems"}"><span class="material-symbols-outlined" style="font-size: 20px" translate="no">download</span>Download PDF</button></div><div class="ds-signup-banner-trigger-container"><div class="ds-signup-banner-trigger ds-signup-banner-trigger-control"></div></div><div class="ds-signup-banner ds-signup-banner-control"><div id="ds-signup-banner-close-button"><button class="ds2-5-button ds2-5-button--secondary ds2-5-button--inverse"><span class="material-symbols-outlined" style="font-size: 20px" translate="no">close</span></button></div><div class="ds-signup-banner-ctas"><img src="//a.academia-assets.com/images/academia-logo-capital-white.svg" /><h4 class="ds2-5-heading-serif-sm">Sign up for access to the world's latest research</h4><button class="ds2-5-button ds2-5-button--inverse ds2-5-button--full-width js-swp-download-button" data-signup-modal="{"location":"signup-banner"}">Sign up for free<span class="material-symbols-outlined" style="font-size: 20px" translate="no">arrow_forward</span></button></div><div class="ds-signup-banner-divider"></div><div class="ds-signup-banner-reasons"><div class="ds-signup-banner-reasons-item"><span class="material-symbols-outlined" style="font-size: 24px" translate="no">check</span><span>Get notified about relevant papers</span></div><div class="ds-signup-banner-reasons-item"><span class="material-symbols-outlined" style="font-size: 24px" translate="no">check</span><span>Save papers to use in your research</span></div><div class="ds-signup-banner-reasons-item"><span class="material-symbols-outlined" style="font-size: 24px" translate="no">check</span><span>Join the discussion with peers</span></div><div class="ds-signup-banner-reasons-item"><span class="material-symbols-outlined" style="font-size: 24px" translate="no">check</span><span>Track your impact</span></div></div></div><script>(() => { // Set up signup banner show/hide behavior: // 1. 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Air injection flow rates between 10 mlph and 100 mlph have been tested for orifices of diameters 0.58 mm, 1.05 mm and 1.6 mm. The force field around single isolated bubbles during growth and detachment has been investigated experimentally with the aid of high speed photography and detailed image processing and measurement of the internal bubble pressure. Different flow rates have been compared in order to elucidate dynamic effects. Combining measurements of the instantaneous gas pressure, measurements of the local curvature and the Young-Laplace equation has allowed the estimation of the liquid pressure field acting on the gas-liquid interface over the entire bubble surface. These have subsequently been decomposed into constitutive components such as buoyancy, contact pressure, capillary and the dynamic pressure forces.</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Experimental study of gas injected bubble growth from submerged orifices","attachmentId":89619280,"attachmentType":"pdf","work_url":"https://www.academia.edu/84681622/Experimental_study_of_gas_injected_bubble_growth_from_submerged_orifices","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/84681622/Experimental_study_of_gas_injected_bubble_growth_from_submerged_orifices"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="1" data-entity-id="114367161" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/114367161/Study_of_Stream_Flow_Effects_on_Bubble_Motion">Study of Stream Flow Effects on Bubble Motion</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="295420067" href="https://independent.academia.edu/SamirSami43">Samir Sami</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Nuclear Technology, 1983</p><p class="ds-related-work--abstract ds2-5-body-sm">The formation of air bubbles at constant-pressure, submerged orifices was investigated in both quiescent and moving streams inside a vertical tube. Parameters affecting the bubble rise velocity, such as bubble generating frequency and diameter, were studied and analyzed for bubbles rising in a chain and homogeneous mixture. A special technique for measuring bubble motion parameters has been developed, tested, and employed throughout the experimental investigation. The method is based on a water-air impedance variation. Results obtained in stagnant liquid show that increasing the bubble diameter serves to increase bubble rise velocity, while an opposite trend has been observed for stream liquid where the bubble diameter increase reduces the bubble rise velocity. The increase of bubble generation frequency generally increases the bubble rise velocity. Experimental data covered with bubble radial distribution showed symmetrical profiles of bubble velocity and frequency, and the radial distribution of the velocity profiles sometimes has two maxima and one minimum depending on the liquid velocity. Finally, in stagnant liquid, a normalized correlation has been developed to predict the terminal rise velocity in terms of bubble generating frequency, bubble diameter, single bubble rise velocity, and conduit dimensions. Another correlation is presented for forced bubbly flow, where the bubble rise velocity is expressed as a function of bubble generating frequency, bubble diameter, and water superficial velocity.</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Study of Stream Flow Effects on Bubble Motion","attachmentId":111084378,"attachmentType":"pdf","work_url":"https://www.academia.edu/114367161/Study_of_Stream_Flow_Effects_on_Bubble_Motion","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/114367161/Study_of_Stream_Flow_Effects_on_Bubble_Motion"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="2" data-entity-id="88499981" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/88499981/Computational_Modeling_of_Bubble_Growth_from_a_Submerged_Orifice_with_Constant_Airflow_Rate">Computational Modeling of Bubble Growth from a Submerged Orifice with Constant Airflow Rate</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="118593018" href="https://independent.academia.edu/SachinKumar829">Sachin Kumar</a></div><p class="ds-related-work--metadata ds2-5-body-xs">International Journal of Mechanical and Production Engineering Research and Development, 2020</p><p class="ds-related-work--abstract ds2-5-body-sm">This study investigated the single bubble evolution in immersed orifice with a view the effect of bubble shape changes with time and variation of pressure in the liquid during the bubble move upward during the bubble growth, pinch-off region and detachment has been investigated by using computational fluid dynamics. The orifice diameter varies from 0.5mm to 2mm. Measurement of an arc is created and Young-Laplace equation has used to the estimation of the pressure of liquid varies in the gas liquid surface where the bubble is evolved. The present wok is focused on different wetting conditions at low gas flow rate and wetting region of the orifice with orifice base was studied for the working fluid of air and water at. Analytical simulations of bubble formation with constant flow rate and constant gravity where the formation of bubble occurred when the inertia force is going to be leading force which was coupled with level set and volume of fluid (CLSVOF). Simulation data on the transition of bubble formation by using the capillary number with different wetting condition.</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Computational Modeling of Bubble Growth from a Submerged Orifice with Constant Airflow Rate","attachmentId":92463116,"attachmentType":"pdf","work_url":"https://www.academia.edu/88499981/Computational_Modeling_of_Bubble_Growth_from_a_Submerged_Orifice_with_Constant_Airflow_Rate","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/88499981/Computational_Modeling_of_Bubble_Growth_from_a_Submerged_Orifice_with_Constant_Airflow_Rate"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="3" data-entity-id="23803304" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/23803304/Effect_of_wetting_conditions_and_flow_rate_on_bubble_formation_at_orifices_submerged_in_water">Effect of wetting conditions and flow rate on bubble formation at orifices submerged in water</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="45963155" href="https://upm-es.academia.edu/GCorchero">G. Corchero</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2006</p><p class="ds-related-work--abstract ds2-5-body-sm">An experimental investigation has been carried out on the generation of bubbles due to the injection of a constant flow rate of air through an orifice submerged in water. Orifices of different radii drilled in horizontal plates of different materials, both hydrophilic and hydrophobic, have been used to cover a range of static contact angles (68 • ≤ θ 0 ≤ 123 • ), and a wide range of volumetric gas flow rates (0.5 mm 3 /s ≤ Q ≤ 1.33 × 10 4 mm 3 /s) has been investigated. It is shown that data for different static contact angles and orifice radii can be approximately reduced to a single bubble volume/flow rate relationship when a properly scaled bubble volume at detachment is plotted versus a properly scaled volumetric gas flow rate. This data reduction permits an easy estimation of the bubble volume for any constant volumetric gas flow rate.</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Effect of wetting conditions and flow rate on bubble formation at orifices submerged in water","attachmentId":44224996,"attachmentType":"pdf","work_url":"https://www.academia.edu/23803304/Effect_of_wetting_conditions_and_flow_rate_on_bubble_formation_at_orifices_submerged_in_water","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/23803304/Effect_of_wetting_conditions_and_flow_rate_on_bubble_formation_at_orifices_submerged_in_water"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="4" data-entity-id="83541752" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/83541752/Experimental_Analysis_of_Multiple_Air_Bubbles_Rise_in_Water_Channel_Using_A_Submerged_Needle">Experimental Analysis of Multiple Air-Bubbles Rise in Water Channel Using A Submerged Needle</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="16179503" href="https://kpkuet.academia.edu/KareemAkhtar">Kareem Akhtar</a></div><p class="ds-related-work--metadata ds2-5-body-xs">2019</p><p class="ds-related-work--abstract ds2-5-body-sm">Article history: Received 25 September 2019 Received in revised form 19 October 2019 Accepted 2 November 2019 Available online 10 November 2019 2019 This paper studies the ascent of multiple air bubbles experimentally utilizing a highframerate camera (HSC) (400 fps) which has the ability to capture fast moving objects which can then be played back in slow motion. Experiments conducted previously suggested that small air bubble pursues a rectilinear rise motion. Bubbles that have radius less than 0.81 mm approximately follows rectilinear path as concluded by [1] [2]. Notwithstanding, in the present study it has been seen that by utilizing a needle inside the water channel, multiple bubbles pursue a spiral movement in a path rather instead of a rising in a straight line. Motion is studied in both of these planes (X-Y and Y-Z). Image processing techniques have been utilized thus to upgrade the quality of the images and along these lines to examine the flow features of the multiple air ...</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Experimental Analysis of Multiple Air-Bubbles Rise in Water Channel Using A Submerged Needle","attachmentId":88851093,"attachmentType":"pdf","work_url":"https://www.academia.edu/83541752/Experimental_Analysis_of_Multiple_Air_Bubbles_Rise_in_Water_Channel_Using_A_Submerged_Needle","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/83541752/Experimental_Analysis_of_Multiple_Air_Bubbles_Rise_in_Water_Channel_Using_A_Submerged_Needle"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="5" data-entity-id="91102879" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/91102879/Field_and_Laboratory_Validation_of_High_Flow_Air_Bubbler_Mechanics">Field and Laboratory Validation of High-Flow Air Bubbler Mechanics</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="41973166" href="https://independent.academia.edu/AndrewTuthill">Andrew Tuthill</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Journal of Cold Regions Engineering, 2005</p><p class="ds-related-work--abstract ds2-5-body-sm">Recent physical model studies have refined designs for high-flow air diffusers for managing accumulations of broken ice at navigation projects. Although these solutions are successful in the model, implementing them in the field can be difficult because of uncertainties in airflow scaling. This study uses field and laboratory data to test theoretical relationships between airflow from the diffuser and the resulting near-surface water velocity. In the experiments, water velocities were measured adjacent to bubbler plumes for depths ranging from 0.52 to 6.5 m and airflow rates ranging from 0.015 to 0.68 standard cubic meters per minute/meter. The observed vertical and horizontal water velocity data compared moderately well to theoretical curves based on the equations of Kobus and Ashton. In addition, a reasonably linear relationship was found between the average velocity of the horizontal, near-surface flow field V and unit airflow from the diffuser Q a .</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Field and Laboratory Validation of High-Flow Air Bubbler Mechanics","attachmentId":94484920,"attachmentType":"pdf","work_url":"https://www.academia.edu/91102879/Field_and_Laboratory_Validation_of_High_Flow_Air_Bubbler_Mechanics","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/91102879/Field_and_Laboratory_Validation_of_High_Flow_Air_Bubbler_Mechanics"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="6" data-entity-id="79937815" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/79937815/Influences_of_Operating_Variables_on_Hydrodynamic_Performance_of_Plunging_Water_Jet_Downflow_Bubble_Column">Influences of Operating Variables on Hydrodynamic Performance of Plunging Water Jet Downflow Bubble Column</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="13588330" href="https://independent.academia.edu/YasserAbdulaziz">Yasser Abdulaziz</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Iraqi Journal of Chemical and Petroleum Engineering, 2014</p><p class="ds-related-work--abstract ds2-5-body-sm">The hydrodynamics of a co-current down flow bubble column has been investigated with air – water system. A Perspex bubble column of 5cm in diameter and 1.5m height is used as a test contactor using nozzles of 7, 8 and 9 mm diameter for air-water distributing. The column is provided with three electro-resistivity needle probes for bubble detection. Experimental work is carried out with air flow rates from 0.09 to 0.45 m3/hr and liquid flow rates from 0.65 to 1.1m3/hr in order to study the effects of superficial gas velocity, nozzle diameter and liquid flow rate on the characteristics of hydrodynamic interactions viz. gas hold up, bubble diameter and bubble velocity by using two technical methods, direct height measurements for air-water mixture in the column and resistivity probe techniques. Gas hold up is found to be progressively increased with increasing superficial gas velocity and with decreasing liquid flow rate. Lower gas hold up is obtained with smaller nozzle diameter. Howev...</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Influences of Operating Variables on Hydrodynamic Performance of Plunging Water Jet Downflow Bubble Column","attachmentId":86486120,"attachmentType":"pdf","work_url":"https://www.academia.edu/79937815/Influences_of_Operating_Variables_on_Hydrodynamic_Performance_of_Plunging_Water_Jet_Downflow_Bubble_Column","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/79937815/Influences_of_Operating_Variables_on_Hydrodynamic_Performance_of_Plunging_Water_Jet_Downflow_Bubble_Column"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="7" data-entity-id="34155175" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/34155175/ANALYSIS_OF_AIR_BUBBLE_PLUMES">ANALYSIS OF AIR-BUBBLE PLUMES</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="67053127" href="https://independent.academia.edu/AgapovAlexander">Alexander Agapov</a></div><p class="ds-related-work--abstract ds2-5-body-sm">Models are developed to describe the gross behavior of air-bubble plumes generated by point and line sources of air-bubbles released in stagnant water bodies of uniform density. The models predict plume width, velocities, and induced flow rates as a function of elevation above the source. The analysis is confined to the plume mechanics and does not include the horizontal flow created at the surface by the plume. An integral similarity approach, similar to that used for single-phase buoyant plumes, is employed. Governing equations are found by applying conservation of mass, momentum, and buoyancy. The compressibility of the air and the differential velocity between the rising air bubbles and water are introduced in the buoyancy flux equation. Generalized solutions to the normalized governing equations are presented for both point and line sources of air-bubbles. The results of the analyses are compared with existing large-scale experimental data. The comparisons indicate that the models predict the gross behavior of plumes well and yield estimates of the entrain-ment coefficients and lateral spreading ratios.</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"ANALYSIS OF AIR-BUBBLE PLUMES","attachmentId":54078113,"attachmentType":"pdf","work_url":"https://www.academia.edu/34155175/ANALYSIS_OF_AIR_BUBBLE_PLUMES","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/34155175/ANALYSIS_OF_AIR_BUBBLE_PLUMES"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="8" data-entity-id="114425536" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/114425536/Air_entrapment_and_air_bubble_dispersion_at_two_dimensional_plunging_water_jets">Air entrapment and air bubble dispersion at two-dimensional plunging water jets</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="248334753" href="https://uq.academia.edu/HubertChanson">Hubert Chanson</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Chemical Engineering Science, 1998</p><p class="ds-related-work--abstract ds2-5-body-sm">Air-water bubbly flows are encountered in numerous engineering applications. One type of air-water shear flow, the developing flow region of a plunging jet, is discussed in the light of new experimental evidence. Distributions of air concentration and mean air-water velocity, and bubble chord length distributions are presented for inflow velocities ranging from 2 to 8 m/s. The results indicate that the distributions of void fraction follow closely analytical solutions of the diffusion equation, as developed by Chanson (1995a Report, CH46/95, pp. 368, 1997 Report CH48/97). In air-water shear layers, the velocity distributions have the same shape as in monophase flows but the characteristic parameters of the shear layer differ from monophase flow results, because of the interactions between the entrained air bubbles and the turbulence.</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Air entrapment and air bubble dispersion at two-dimensional plunging water jets","attachmentId":111127416,"attachmentType":"pdf","work_url":"https://www.academia.edu/114425536/Air_entrapment_and_air_bubble_dispersion_at_two_dimensional_plunging_water_jets","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/114425536/Air_entrapment_and_air_bubble_dispersion_at_two_dimensional_plunging_water_jets"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="9" data-entity-id="56545523" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/56545523/Similitude_of_air_bubble_entrainment_and_dispersion_in_vertical_circular_plunging_jet_flows_An_experimental_study_with_freshwater_salty_freshwater_and_seawater">Similitude of air bubble entrainment and dispersion in vertical circular plunging jet flows. An experimental study with freshwater, salty freshwater and seawater</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="853151" href="https://uniraj.academia.edu/AshabulHoque">Ashabul Hoque</a></div><p class="ds-related-work--metadata ds2-5-body-xs">2002</p><p class="ds-related-work--abstract ds2-5-body-sm">E-mail: h.chanson@mailbox.uq.edu.au - Website: http://www.uq.edu.au/~e2hchans/ ... Dept of Architecture and Civil Engineering, Toyohashi University of Technology, Toyohashi 441-8580, Japan ... E-mail: aoki@jughead.tutrp.tut.ac.jp ... Dept of Architecture and Civil ...</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Similitude of air bubble entrainment and dispersion in vertical circular plunging jet flows. An experimental study with freshwater, salty freshwater and seawater","attachmentId":71880621,"attachmentType":"pdf","work_url":"https://www.academia.edu/56545523/Similitude_of_air_bubble_entrainment_and_dispersion_in_vertical_circular_plunging_jet_flows_An_experimental_study_with_freshwater_salty_freshwater_and_seawater","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/56545523/Similitude_of_air_bubble_entrainment_and_dispersion_in_vertical_circular_plunging_jet_flows_An_experimental_study_with_freshwater_salty_freshwater_and_seawater"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div></div></div><div class="ds-sticky-ctas--wrapper js-loswp-sticky-ctas hidden"><div class="ds-sticky-ctas--grid-container"><div class="ds-sticky-ctas--container"><button class="ds2-5-button js-swp-download-button" data-signup-modal="{"location":"continue-reading-button--sticky-ctas","attachmentId":107519934,"attachmentType":"pdf","workUrl":null}">See full PDF</button><button class="ds2-5-button ds2-5-button--secondary js-swp-download-button" data-signup-modal="{"location":"download-pdf-button--sticky-ctas","attachmentId":107519934,"attachmentType":"pdf","workUrl":null}"><span class="material-symbols-outlined" style="font-size: 20px" translate="no">download</span>Download PDF</button></div></div></div><div class="ds-below-fold--grid-container"><div class="ds-work--container js-loswp-embedded-document"><div class="attachment_preview" data-attachment="Attachment_107519934" style="display: none"><div class="js-scribd-document-container"><div class="scribd--document-loading js-scribd-document-loader" style="display: block;"><img alt="Loading..." src="//a.academia-assets.com/images/loaders/paper-load.gif" /><p>Loading Preview</p></div></div><div style="text-align: center;"><div class="scribd--no-preview-alert js-preview-unavailable"><p>Sorry, preview is currently unavailable. You can download the paper by clicking the button above.</p></div></div></div></div><div class="ds-sidebar--container js-work-sidebar"><div class="ds-related-content--container"><h2 class="ds-related-content--heading">Related papers</h2><div class="ds-related-work--container js-related-work-sidebar-card" data-collection-position="0" data-entity-id="51231639" data-sort-order="default"><a class="ds-related-work--title js-related-work-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/51231639/Numerical_simulation_of_periodic_bubble_formation_at_a_submerged_orifice_with_constant_gas_flow_rate">Numerical simulation of periodic bubble formation at a submerged orifice with constant gas flow rate</a><div class="ds-related-work--metadata"><a class="js-related-work-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="36456337" href="https://independent.academia.edu/FDurst1">Franz Durst</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Chemical 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data-entity-id="59857342" data-sort-order="default"><a class="ds-related-work--title js-related-work-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/59857342/Modification_Equations_of_Air_Bubbles_Distributions_at_Self_Air_Entrainment_Condition">Modification Equations of Air Bubbles Distributions at Self-Air Entrainment Condition</a><div class="ds-related-work--metadata"><a class="js-related-work-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="121525360" href="https://sikadu.academia.edu/YeriSutopo">Yeri Sutopo</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Jurnal Teknologi</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Modification Equations of Air Bubbles Distributions at Self-Air Entrainment 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ds2-5-body-link" href="https://www.academia.edu/57638469/Air_Bubble_Generation_Through_a_Submerged_Micro_Hole">Air Bubble Generation Through a Submerged Micro-Hole</a><div class="ds-related-work--metadata"><a class="js-related-work-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="63380911" href="https://independent.academia.edu/PingheiChen">Ping-hei Chen</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Chemical Engineering Research and Design, 2002</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Air Bubble Generation Through a Submerged Micro-Hole","attachmentId":72441947,"attachmentType":"pdf","work_url":"https://www.academia.edu/57638469/Air_Bubble_Generation_Through_a_Submerged_Micro_Hole","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" 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