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flow</title> <meta name="description" content="Search results for: atmospheric flow"> <meta name="keywords" content="atmospheric flow"> <meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1, maximum-scale=1, user-scalable=no"> <meta charset="utf-8"> <link href="https://cdn.waset.org/favicon.ico" type="image/x-icon" rel="shortcut icon"> <link href="https://cdn.waset.org/static/plugins/bootstrap-4.2.1/css/bootstrap.min.css" rel="stylesheet"> <link href="https://cdn.waset.org/static/plugins/fontawesome/css/all.min.css" rel="stylesheet"> <link href="https://cdn.waset.org/static/css/site.css?v=150220211555" rel="stylesheet"> </head> <body> <header> <div class="container"> <nav class="navbar navbar-expand-lg navbar-light"> <a class="navbar-brand" href="https://waset.org"> <img src="https://cdn.waset.org/static/images/wasetc.png" alt="Open Science Research Excellence" title="Open Science Research Excellence" /> </a> <button class="d-block d-lg-none navbar-toggler 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id="custom-search-input"> <div class="input-group"> <i class="fas fa-search"></i> <input type="text" class="search-query" name="q" placeholder="Author, Title, Abstract, Keywords" value="atmospheric flow"> <input type="submit" class="btn_search" value="Search"> </div> </div> </form> </div> </div> <div class="row mt-3"> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Commenced</strong> in January 2007</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Frequency:</strong> Monthly</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Edition:</strong> International</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Paper Count:</strong> 5337</div> </div> </div> </div> <h1 class="mt-3 mb-3 text-center" style="font-size:1.6rem;">Search results for: atmospheric flow</h1> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">5337</span> Hypersonic Flow of CO2-N2 Mixture around a Spacecraft during the Atmospheric Reentry</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Zineddine%20Bouyahiaoui">Zineddine Bouyahiaoui</a>, <a href="https://publications.waset.org/abstracts/search?q=Rabah%20Haoui"> Rabah Haoui</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The aim of this work is to analyze a flow around the axisymmetric blunt body taken into account the chemical and vibrational nonequilibrium flow. This work concerns the entry of spacecraft in the atmosphere of the planet Mars. Since the equations involved are non-linear partial derivatives, the volume method is the only way to solve this problem. The choice of the mesh and the CFL is a condition for the convergence to have the stationary solution. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=blunt%20body" title="blunt body">blunt body</a>, <a href="https://publications.waset.org/abstracts/search?q=finite%20volume" title=" finite volume"> finite volume</a>, <a href="https://publications.waset.org/abstracts/search?q=hypersonic%20flow" title=" hypersonic flow"> hypersonic flow</a>, <a href="https://publications.waset.org/abstracts/search?q=viscous%20flow" title=" viscous flow"> viscous flow</a> </p> <a href="https://publications.waset.org/abstracts/85387/hypersonic-flow-of-co2-n2-mixture-around-a-spacecraft-during-the-atmospheric-reentry" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/85387.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">234</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">5336</span> Flow Characterization in Complex Terrain for Aviation Safety</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Adil%20Rasheed">Adil Rasheed</a>, <a href="https://publications.waset.org/abstracts/search?q=Mandar%20Tabib"> Mandar Tabib</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The paper describes the ability of a high-resolution Computational Fluid Dynamics model to predict terrain-induced turbulence and wind shear close to the ground. Various sensitivity studies to choose the optimal simulation setup for modeling the flow characteristics in a complex terrain are presented. The capabilities of the model are demonstrated by applying it to the Sandnessjøen Airport, Stokka in Norway, an airport that is located in a mountainous area. The model is able to forecast turbulence in real time and trigger an alert when atmospheric conditions might result in high wind shear and turbulence. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=aviation%20safety" title="aviation safety">aviation safety</a>, <a href="https://publications.waset.org/abstracts/search?q=terrain-induced%20turbulence" title=" terrain-induced turbulence"> terrain-induced turbulence</a>, <a href="https://publications.waset.org/abstracts/search?q=atmospheric%20flow" title=" atmospheric flow"> atmospheric flow</a>, <a href="https://publications.waset.org/abstracts/search?q=alert%20system" title=" alert system"> alert system</a> </p> <a href="https://publications.waset.org/abstracts/42780/flow-characterization-in-complex-terrain-for-aviation-safety" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/42780.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">416</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">5335</span> Effect of Atmospheric Pressure on the Flow at the Outlet of a Propellant Nozzle</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=R.%20Haoui">R. Haoui</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The purpose of this work is to simulate the flow at the exit of Vulcan 1 engine of European launcher Ariane 5. The geometry of the propellant nozzle is already determined using the characteristics method. The pressure in the outlet section of the nozzle is less than atmospheric pressure on the ground, causing the existence of oblique and normal shock waves at the exit. During the rise of the launcher, the atmospheric pressure decreases and the shock wave disappears. The code allows the capture of shock wave at exit of nozzle. The numerical technique uses the Flux Vector Splitting method of Van Leer to ensure convergence and avoid the calculation instabilities. The Courant, Friedrichs and Lewy coefficient (CFL) and mesh size level are selected to ensure the numerical convergence. The nonlinear partial derivative equations system which governs this flow is solved by an explicit unsteady numerical scheme by the finite volume method. The accuracy of the solution depends on the size of the mesh and also the step of time used in the discretized equations. We have chosen in this study the mesh that gives us a stationary solution with good accuracy. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=finite%20volume" title="finite volume">finite volume</a>, <a href="https://publications.waset.org/abstracts/search?q=lunchers" title=" lunchers"> lunchers</a>, <a href="https://publications.waset.org/abstracts/search?q=nozzles" title=" nozzles"> nozzles</a>, <a href="https://publications.waset.org/abstracts/search?q=shock%20wave" title=" shock wave"> shock wave</a> </p> <a href="https://publications.waset.org/abstracts/53415/effect-of-atmospheric-pressure-on-the-flow-at-the-outlet-of-a-propellant-nozzle" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/53415.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">289</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">5334</span> Neuronal Networks for the Study of the Effects of Cosmic Rays on Climate Variations</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Jossitt%20Williams%20Vargas%20Cruz">Jossitt Williams Vargas Cruz</a>, <a href="https://publications.waset.org/abstracts/search?q=Aura%20Jazm%C3%ADn%20P%C3%A9rez%20R%C3%ADos"> Aura Jazmín Pérez Ríos</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The variations of solar dynamics have become a relevant topic of study due to the effects of climate changes generated on the earth. One of the most disconcerting aspects is the variability that the sun has on the climate is the role played by sunspots (extra-atmospheric variable) in the modulation of the Cosmic Rays CR (extra-atmospheric variable). CRs influence the earth's climate by affecting cloud formation (atmospheric variable), and solar cycle influence is associated with the presence of solar storms, and the magnetic activity is greater, resulting in less CR entering the earth's atmosphere. The different methods of climate prediction in Colombia do not take into account the extra-atmospheric variables. Therefore, correlations between atmospheric and extra-atmospheric variables were studied in order to implement a Python code based on neural networks to make the prediction of the extra-atmospheric variable with the highest correlation. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=correlations" title="correlations">correlations</a>, <a href="https://publications.waset.org/abstracts/search?q=cosmic%20rays" title=" cosmic rays"> cosmic rays</a>, <a href="https://publications.waset.org/abstracts/search?q=sun" title=" sun"> sun</a>, <a href="https://publications.waset.org/abstracts/search?q=sunspots%20and%20variations." title=" sunspots and variations."> sunspots and variations.</a> </p> <a href="https://publications.waset.org/abstracts/163231/neuronal-networks-for-the-study-of-the-effects-of-cosmic-rays-on-climate-variations" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/163231.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">74</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">5333</span> Investigation of the Technological Demonstrator 14x B in Different Angle of Attack in Hypersonic Velocity</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Victor%20Alves%20Barros%20Galv%C3%A3o">Victor Alves Barros Galvão</a>, <a href="https://publications.waset.org/abstracts/search?q=Israel%20Da%20Silveira%20Rego"> Israel Da Silveira Rego</a>, <a href="https://publications.waset.org/abstracts/search?q=Antonio%20Carlos%20Oliveira"> Antonio Carlos Oliveira</a>, <a href="https://publications.waset.org/abstracts/search?q=Paulo%20Gilberto%20De%20Paula%20Toro"> Paulo Gilberto De Paula Toro</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The Brazilian hypersonic aerospace vehicle 14-X B, VHA 14-X B, is a vehicle integrated with the hypersonic airbreathing propulsion system based on supersonic combustion (scramjet), developing in Aerothermodynamics and hypersonic Prof. Henry T. Nagamatsu Laboratory, to conduct demonstration in atmospheric flight at the speed corresponding to Mach number 7 at an altitude of 30km. In the experimental procedure the hypersonic shock tunnel T3 was used, installed in that laboratory. This device simulates the flow over a model is fixed in the test section and can also simulate different atmospheric conditions. The scramjet technology offers substantial advantages to improve aerospace vehicle performance which flies at a hypersonic speed through the Earth's atmosphere by reducing fuel consumption on board. Basically, the scramjet is an aspirated aircraft engine fully integrated that uses oblique/conic shock waves generated during hypersonic flight, to promote the deceleration and compression of atmospheric air in scramjet inlet. During the hypersonic flight, the vehicle VHA 14-X will suffer atmospheric influences, promoting changes in the vehicle's angles of attack (angle that the mean line of vehicle makes with respect to the direction of the flow). Based on this information, a study is conducted to analyze the influences of changes in the vehicle's angle of attack during the atmospheric flight. Analytical theoretical analysis, simulation computational fluid dynamics and experimental investigation are the methodologies used to design a technological demonstrator prior to the flight in the atmosphere. This paper considers analysis of the thermodynamic properties (pressure, temperature, density, sound velocity) in lower surface of the VHA 14-X B. Also, it considers air as an ideal gas and chemical equilibrium, with and without boundary layer, considering changes in the vehicle's angle of attack (positive and negative in relation to the flow) and bi-dimensional expansion wave theory at the expansion section (Theory of Prandtl-Meyer). <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=angle%20of%20attack" title="angle of attack">angle of attack</a>, <a href="https://publications.waset.org/abstracts/search?q=experimental%20hypersonic" title=" experimental hypersonic"> experimental hypersonic</a>, <a href="https://publications.waset.org/abstracts/search?q=hypersonic%20airbreathing%20propulsion" title=" hypersonic airbreathing propulsion"> hypersonic airbreathing propulsion</a>, <a href="https://publications.waset.org/abstracts/search?q=Scramjet" title=" Scramjet"> Scramjet</a> </p> <a href="https://publications.waset.org/abstracts/59619/investigation-of-the-technological-demonstrator-14x-b-in-different-angle-of-attack-in-hypersonic-velocity" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/59619.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">410</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">5332</span> Atmospheric Plasma Treatment to Improve Water and Oil Repellent Finishing for PET and PET/Spandex Fabrics</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Mehtap%20%C3%87al%C4%B1%C5%9Fkan">Mehtap Çalışkan</a>, <a href="https://publications.waset.org/abstracts/search?q=Nil%C3%BCfer%20Y%C4%B1ld%C4%B1z%20Varan"> Nilüfer Yıldız Varan</a>, <a href="https://publications.waset.org/abstracts/search?q=Volkan%20Kaplan"> Volkan Kaplan</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In this study, the effects of an atmospheric plasma treatment on the durability of water and oil repellent finishes of PET and PET/Spandex fabrics were tested. Fabrics were treated with a low-frequency atmospheric pressure glow discharge. After plasma treatments, the water and oil repellent finishes were applied using pad-dry-cure method. It was observed that plasma treatments improved the durability finish for all fabrics. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=atmospheric%20plasma" title="atmospheric plasma">atmospheric plasma</a>, <a href="https://publications.waset.org/abstracts/search?q=durable%20coating" title=" durable coating"> durable coating</a>, <a href="https://publications.waset.org/abstracts/search?q=oil%20repellency" title=" oil repellency"> oil repellency</a>, <a href="https://publications.waset.org/abstracts/search?q=PET%2Fspandex%20fabrics" title=" PET/spandex fabrics"> PET/spandex fabrics</a>, <a href="https://publications.waset.org/abstracts/search?q=water%20repellency" title=" water repellency"> water repellency</a> </p> <a href="https://publications.waset.org/abstracts/68560/atmospheric-plasma-treatment-to-improve-water-and-oil-repellent-finishing-for-pet-and-petspandex-fabrics" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/68560.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">412</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">5331</span> Learning Materials of Atmospheric Pressure Plasma Process: Turning Hydrophilic Surface to Hydrophobic</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=C.W.%20Kan">C.W. Kan</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This paper investigates the use of atmospheric pressure plasma for improving the surface hydrophobicity of polyurethane synthetic leather with tetramethylsilane (TMS). The atmospheric pressure plasma treatment with TMS is a single-step process to enhance the hydrophobicity of polyurethane synthetic leather. The hydrophobicity of the treated surface was examined by contact angle measurement. The physical and chemical surface changes were evaluated by scanning electron microscopy (SEM) and infrared spectroscopy (FTIR). The purpose of this paper is to provide learning materials for understanding how to use atmospheric pressure plasma in the textile finishing process to transform a hydrophilic surface to hydrophobic. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=Learning%20materials" title="Learning materials">Learning materials</a>, <a href="https://publications.waset.org/abstracts/search?q=atmospheric%20pressure%20plasma%20treatment" title=" atmospheric pressure plasma treatment"> atmospheric pressure plasma treatment</a>, <a href="https://publications.waset.org/abstracts/search?q=hydrophobic" title=" hydrophobic"> hydrophobic</a>, <a href="https://publications.waset.org/abstracts/search?q=hydrophilic" title=" hydrophilic"> hydrophilic</a>, <a href="https://publications.waset.org/abstracts/search?q=surface" title=" surface"> surface</a> </p> <a href="https://publications.waset.org/abstracts/49534/learning-materials-of-atmospheric-pressure-plasma-process-turning-hydrophilic-surface-to-hydrophobic" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/49534.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">353</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">5330</span> Atmospheric Circulation Drivers Of Nationally-Aggregated Wind Energy Production Over Greece</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Kostas%20Philippopoulos">Kostas Philippopoulos</a>, <a href="https://publications.waset.org/abstracts/search?q=Chris%20G.%20Tzanis"> Chris G. Tzanis</a>, <a href="https://publications.waset.org/abstracts/search?q=Despina%20Deligiorgi"> Despina Deligiorgi</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Climate change adaptation requires the exploitation of renewable energy sources such as wind. However, climate variability can affect the regional wind energy potential and consequently the available wind power production. The goal of the research project is to examine the impact of atmospheric circulation on wind energy production over Greece. In the context of synoptic climatology, the proposed novel methodology employs Self-Organizing Maps for grouping and classifying the atmospheric circulation and nationally-aggregated capacity factor time series for a 30-year period. The results indicate the critical effect of atmospheric circulation on the national aggregated wind energy production values and therefore address the issue of optimum distribution of wind farms for a specific region. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=wind%20energy" title="wind energy">wind energy</a>, <a href="https://publications.waset.org/abstracts/search?q=atmospheric%20circulation" title=" atmospheric circulation"> atmospheric circulation</a>, <a href="https://publications.waset.org/abstracts/search?q=capacity%20factor" title=" capacity factor"> capacity factor</a>, <a href="https://publications.waset.org/abstracts/search?q=self-organizing%20maps" title=" self-organizing maps"> self-organizing maps</a> </p> <a href="https://publications.waset.org/abstracts/146188/atmospheric-circulation-drivers-of-nationally-aggregated-wind-energy-production-over-greece" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/146188.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">162</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">5329</span> Measurement of Liquid Film Thickness in a Vertical Annular Two Phase Flow Changing the Gas-Liquid Density Ratio</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Shoji%20Mori">Shoji Mori</a>, <a href="https://publications.waset.org/abstracts/search?q=Kunito%20Okuyama"> Kunito Okuyama</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Annular two phase flow is encountered in many industrial equipments, including flow near nuclear fuel rods in boiling water reactor (BWR). Especially, disturbance waves play important roles in the pressure drop, the generation of entrainments, and the dryout of the liquid film. Therefore, it is important to clarify the behavior of disturbance waves and base film. However, most of the previous studies have been performed under atmospheric pressure conditions that provides the properties of liquid and gas which are significantly different from those of a BWR. Therefore, the effect of properties in gas and liquid on liquid film characteristics should be clarified. In this paper we focus on the effect of gas-liquid density ratio on liquid film thickness characteristics. The experiments have been conducted at four density ratio conditions (ρL/ρG =763, 451, 231, and 31). As a result, it is found that and interfacial shear stress collapse not only tF ave but also tF max and tF min successfully under the same liquid mass flow rate conditions irrespective of ρL/ρG, and moreover a non-dimensional parameter tends to collapse tF max，tF ave，and tF min in the wide range of experimental conditions (ρL/ρG：31～763，We：10～1800，ReL:500 ～ 2200). <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=two%20phase%20flow" title="two phase flow">two phase flow</a>, <a href="https://publications.waset.org/abstracts/search?q=liquid%20film" title=" liquid film"> liquid film</a>, <a href="https://publications.waset.org/abstracts/search?q=annular%20flow" title=" annular flow"> annular flow</a>, <a href="https://publications.waset.org/abstracts/search?q=disturbance%20wave" title=" disturbance wave"> disturbance wave</a> </p> <a href="https://publications.waset.org/abstracts/34514/measurement-of-liquid-film-thickness-in-a-vertical-annular-two-phase-flow-changing-the-gas-liquid-density-ratio" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/34514.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">389</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">5328</span> Numerical Study of Bubbling Fluidized Beds Operating at Sub-atmospheric Conditions</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Lanka%20Dinushke%20Weerasiri">Lanka Dinushke Weerasiri</a>, <a href="https://publications.waset.org/abstracts/search?q=Subrat%20Das"> Subrat Das</a>, <a href="https://publications.waset.org/abstracts/search?q=Daniel%20Fabijanic"> Daniel Fabijanic</a>, <a href="https://publications.waset.org/abstracts/search?q=William%20Yang"> William Yang</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Fluidization at vacuum pressure has been a topic that is of growing research interest. Several industrial applications (such as drying, extractive metallurgy, and chemical vapor deposition (CVD)) can potentially take advantage of vacuum pressure fluidization. Particularly, the fine chemical industry requires processing under safe conditions for thermolabile substances, and reduced pressure fluidized beds offer an alternative. Fluidized beds under vacuum conditions provide optimal conditions for treatment of granular materials where the reduced gas pressure maintains an operational environment outside of flammability conditions. The fluidization at low-pressure is markedly different from the usual gas flow patterns of atmospheric fluidization. The different flow regimes can be characterized by the dimensionless Knudsen number. Nevertheless, hydrodynamics of bubbling vacuum fluidized beds has not been investigated to author’s best knowledge. In this work, the two-fluid numerical method was used to determine the impact of reduced pressure on the fundamental properties of a fluidized bed. The slip flow model implemented by Ansys Fluent User Defined Functions (UDF) was used to determine the interphase momentum exchange coefficient. A wide range of operating pressures was investigated (1.01, 0.5, 0.25, 0.1 and 0.03 Bar). The gas was supplied by a uniform inlet at 1.5U<sub>mf</sub> and 2U<sub>mf</sub>. The predicted minimum fluidization velocity (U<sub>mf</sub>) shows excellent agreement with the experimental data. The results show that the operating pressure has a notable impact on the bed properties and its hydrodynamics. Furthermore, it also shows that the existing Gorosko correlation that predicts bed expansion is not applicable under reduced pressure conditions. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=computational%20fluid%20dynamics" title="computational fluid dynamics">computational fluid dynamics</a>, <a href="https://publications.waset.org/abstracts/search?q=fluidized%20bed" title=" fluidized bed"> fluidized bed</a>, <a href="https://publications.waset.org/abstracts/search?q=gas-solid%20flow" title=" gas-solid flow"> gas-solid flow</a>, <a href="https://publications.waset.org/abstracts/search?q=vacuum%20pressure" title=" vacuum pressure"> vacuum pressure</a>, <a href="https://publications.waset.org/abstracts/search?q=slip%20flow" title=" slip flow"> slip flow</a>, <a href="https://publications.waset.org/abstracts/search?q=minimum%20fluidization%20velocity" title=" minimum fluidization velocity "> minimum fluidization velocity </a> </p> <a href="https://publications.waset.org/abstracts/111148/numerical-study-of-bubbling-fluidized-beds-operating-at-sub-atmospheric-conditions" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/111148.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">140</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">5327</span> Temperature Calculation for an Atmospheric Pressure Plasma Jet by Optical Emission Spectroscopy</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=H.%20Lee">H. Lee</a>, <a href="https://publications.waset.org/abstracts/search?q=Jr."> Jr.</a>, <a href="https://publications.waset.org/abstracts/search?q=L.%20Bo-ot"> L. Bo-ot</a>, <a href="https://publications.waset.org/abstracts/search?q=R.%20Tumlos"> R. Tumlos</a>, <a href="https://publications.waset.org/abstracts/search?q=H.%20Ramos"> H. Ramos</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The objective of the study is to be able to calculate excitation and vibrational temperatures of a 2.45 GHz microwave-induced atmospheric pressure plasma jet. The plasma jet utilizes Argon gas as a primary working gas, while Nitrogen is utilized as a shroud gas for protecting the quartz tube from the plasma discharge. Through Optical Emission Spectroscopy (OES), various emission spectra were acquired from the plasma discharge. Selected lines from Ar I and N2 I emissions were used for the Boltzmann plot technique. The Boltzmann plots yielded values for the excitation and vibrational temperatures. The various values for the temperatures were plotted against varying parameters such as the gas flow rates. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=plasma%20jet" title="plasma jet">plasma jet</a>, <a href="https://publications.waset.org/abstracts/search?q=OES" title=" OES"> OES</a>, <a href="https://publications.waset.org/abstracts/search?q=Boltzmann%20plots" title=" Boltzmann plots"> Boltzmann plots</a>, <a href="https://publications.waset.org/abstracts/search?q=vibrational%20temperatures" title=" vibrational temperatures"> vibrational temperatures</a> </p> <a href="https://publications.waset.org/abstracts/12879/temperature-calculation-for-an-atmospheric-pressure-plasma-jet-by-optical-emission-spectroscopy" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/12879.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">713</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">5326</span> Major Mechanisms of Atmospheric Moisture Transport and Their Role in Precipitation Extreme Events in the Amazonia</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Luis%20Gimeno">Luis Gimeno</a>, <a href="https://publications.waset.org/abstracts/search?q=Rosmeri%20da%20Rocha"> Rosmeri da Rocha</a>, <a href="https://publications.waset.org/abstracts/search?q=Raquel%20Nieto"> Raquel Nieto</a>, <a href="https://publications.waset.org/abstracts/search?q=Tercio%20Ambrizzi"> Tercio Ambrizzi</a>, <a href="https://publications.waset.org/abstracts/search?q=Alex%20Ramos"> Alex Ramos</a>, <a href="https://publications.waset.org/abstracts/search?q=Anita%20Drumond"> Anita Drumond</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The transport of moisture from oceanic sources to the continents represents the atmospheric branch of the water cycle, forming the connection between evaporation from the ocean and precipitation over the continents. In this regard two large scale dynamical/meteorological structures appear to play a key role, namely Low Level Jet (LLJ) systems and Atmospheric Rivers (ARs). The former are particularly important in tropical and subtropical regions; the latter is mostly confined to extratropical regions. A key question relates to the anomalies in the transport of moisture observed during natural hazards related to extremes of precipitation (i.e., drought or wet spells). In this study we will be focused on these two major atmospheric moisture transport mechanisms (LLJs and ARs) and its role in precipitation extreme events (droughts and wet spells) in the Amazonia paying particular attention to i) intensification (decreasing) of moisture transport by them and its role in wet spells (droughts), and ii) changes in their positions and occurrence with associated flooding and wet spells. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=droughts" title="droughts">droughts</a>, <a href="https://publications.waset.org/abstracts/search?q=wet%20spells" title=" wet spells"> wet spells</a>, <a href="https://publications.waset.org/abstracts/search?q=amazonia" title=" amazonia"> amazonia</a>, <a href="https://publications.waset.org/abstracts/search?q=LLJs" title=" LLJs"> LLJs</a>, <a href="https://publications.waset.org/abstracts/search?q=atmospheric%20rivers" title=" atmospheric rivers"> atmospheric rivers</a> </p> <a href="https://publications.waset.org/abstracts/38231/major-mechanisms-of-atmospheric-moisture-transport-and-their-role-in-precipitation-extreme-events-in-the-amazonia" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/38231.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">302</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">5325</span> Wind Turbine Wake Prediction and Validation under a Stably-Stratified Atmospheric Boundary Layer</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Yilei%20Song">Yilei Song</a>, <a href="https://publications.waset.org/abstracts/search?q=Linlin%20Tian"> Linlin Tian</a>, <a href="https://publications.waset.org/abstracts/search?q=Ning%20Zhao"> Ning Zhao</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Turbulence energetics and structures in the wake of large-scale wind turbines under the stably-stratified atmospheric boundary layer (SABL) can be complicated due to the presence of low-level jets (LLJs), a region of higher wind speeds than the geostrophic wind speed. With a modified one-k-equation, eddy viscosity model specified for atmospheric flows as the sub-grid scale (SGS) model, a realistic atmospheric state of the stable ABL is well reproduced by large-eddy simulation (LES) techniques. Corresponding to the precursor stably stratification, the detailed wake properties of a standard 5-MW wind turbine represented as an actuator line model are provided. An engineering model is proposed for wake prediction based on the simulation statistics and gets validated. Results confirm that the proposed wake model can provide good predictions for wind turbines under the SABL. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=large-eddy%20simulation" title="large-eddy simulation">large-eddy simulation</a>, <a href="https://publications.waset.org/abstracts/search?q=stably-stratified%20atmospheric%20boundary%20layer" title=" stably-stratified atmospheric boundary layer"> stably-stratified atmospheric boundary layer</a>, <a href="https://publications.waset.org/abstracts/search?q=wake%20model" title=" wake model"> wake model</a>, <a href="https://publications.waset.org/abstracts/search?q=wind%20turbine%20wake" title=" wind turbine wake"> wind turbine wake</a> </p> <a href="https://publications.waset.org/abstracts/111209/wind-turbine-wake-prediction-and-validation-under-a-stably-stratified-atmospheric-boundary-layer" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/111209.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">174</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">5324</span> Microwave Plasma Dry Reforming of Methane at High CO2/CH4 Feed Ratio</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Nabil%20Majd%20Alawi">Nabil Majd Alawi</a>, <a href="https://publications.waset.org/abstracts/search?q=Gia%20Hung%20Pham"> Gia Hung Pham</a>, <a href="https://publications.waset.org/abstracts/search?q=Ahmed%20Barifcani"> Ahmed Barifcani</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Dry reforming of methane that converts two greenhouses gases (CH<sub>4</sub> and CO<sub>2</sub>) to synthesis gas (a mixture of H<sub>2</sub> and CO) was studied in a commercial bench scale microwave (MW) plasma reactor system at atmospheric pressure. The CO<sub>2</sub>, CH<sub>4</sub> and N<sub>2</sub> conversions; H<sub>2</sub>, CO selectivities and yields, and syngas ratio (H<sub>2</sub>/CO) were investigated in a wide range of total feed flow rate (0.45 – 2.1 L/min), MW power (700 – 1200 watt) and CO<sub>2</sub>/CH<sub>4</sub> molar ratio (2 – 5). At the feed flow rates of CH<sub>4</sub>, CO<sub>2</sub> and N<sub>2</sub> of 0.2, 0.4 and 1.5 L/min respectively, and the MWs input power of 700 W, the highest conversions of CH<sub>4</sub> and CO<sub>2</sub>, selectivity and yield of H<sub>2</sub>, CO and H<sub>2</sub>/CO ratio of 79.35%, 44.82%, 50.12, 58.42, 39.77%, 32.89%, and 0.86, respectively, were achieved. The results of this work show that the product ratio increases slightly with the increasing total feed flow rate, but it decreases significantly with the increasing MW power and feeds CO<sub>2</sub>/CH<sub>4</sub> ratio. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=dry%20reforming%20of%20methane" title="dry reforming of methane">dry reforming of methane</a>, <a href="https://publications.waset.org/abstracts/search?q=microwave%20discharge" title=" microwave discharge"> microwave discharge</a>, <a href="https://publications.waset.org/abstracts/search?q=plasma%20technology" title=" plasma technology"> plasma technology</a>, <a href="https://publications.waset.org/abstracts/search?q=synthesis%20gas%20production" title=" synthesis gas production"> synthesis gas production</a> </p> <a href="https://publications.waset.org/abstracts/95887/microwave-plasma-dry-reforming-of-methane-at-high-co2ch4-feed-ratio" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/95887.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">274</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">5323</span> The Effect of Global Solar Variations on the Performance of n- AlGaAs/ p-GaAs Solar Cells</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=A.%20Guechi">A. Guechi</a>, <a href="https://publications.waset.org/abstracts/search?q=M.%20Chegaar"> M. Chegaar</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This study investigates how AlGaAs/GaAs thin film solar cells perform under varying global solar spectrum due to the changes of environmental parameters such as the air mass and the atmospheric turbidity. The solar irradiance striking the solar cell is simulated using the spectral irradiance model SMARTS2 (Simple Model of the Atmospheric Radiative Transfer of Sunshine) for clear skies on the site of Setif (Algeria). The results show a reduction in the short circuit current due to increasing atmospheric turbidity, it is 63.09% under global radiation. However increasing air mass leads to a reduction in the short circuit current of 81.73%.The efficiency decrease with increasing atmospheric turbidity and air mass. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=AlGaAs%2FGaAs" title="AlGaAs/GaAs">AlGaAs/GaAs</a>, <a href="https://publications.waset.org/abstracts/search?q=solar%20cells" title=" solar cells"> solar cells</a>, <a href="https://publications.waset.org/abstracts/search?q=environmental%20parameters" title=" environmental parameters"> environmental parameters</a>, <a href="https://publications.waset.org/abstracts/search?q=spectral%20variation" title=" spectral variation"> spectral variation</a>, <a href="https://publications.waset.org/abstracts/search?q=SMARTS" title=" SMARTS"> SMARTS</a> </p> <a href="https://publications.waset.org/abstracts/13863/the-effect-of-global-solar-variations-on-the-performance-of-n-algaas-p-gaas-solar-cells" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/13863.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">397</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">5322</span> On Regional Climate Singularity: On Example of the Territory of Georgia</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=T.%20Davitashvili">T. Davitashvili</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In this paper, some results of numerical simulation of the air flow dynamics in the troposphere over the Caucasus Mountains taking place in conditions of nonstationarity of large-scale undisturbed background flow are presented. Main features of the atmospheric currents changeability while air masses are transferred from the Black Sea to the land’s surface had been investigated. In addition, the effects of thermal and advective-dynamic factors of atmosphere on the changes of the West Georgian climate have been studied. It was shown that non-proportional warming of the Black Sea and Colkhi lowland provokes the intensive strengthening of circulation and effect of climate cooling in the western Georgia. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=regional%20climate" title="regional climate">regional climate</a>, <a href="https://publications.waset.org/abstracts/search?q=numerical%20simulation" title=" numerical simulation"> numerical simulation</a>, <a href="https://publications.waset.org/abstracts/search?q=local%20circulation" title=" local circulation"> local circulation</a>, <a href="https://publications.waset.org/abstracts/search?q=orographic%20effect" title=" orographic effect"> orographic effect</a> </p> <a href="https://publications.waset.org/abstracts/10446/on-regional-climate-singularity-on-example-of-the-territory-of-georgia" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/10446.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">482</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">5321</span> Determination of Iodine and Heavy Metals in Two Brands of Iodised Salt</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Z.%20O.%20Apotiola">Z. O. Apotiola</a>, <a href="https://publications.waset.org/abstracts/search?q=J.%20F.%20Fashakin"> J. F. Fashakin</a> </p> <p class="card-text"><strong>Abstract:</strong></p> A study was conducted to investigate the storage stability of Mr Chef and Annapurna salts. The salts were bought from Mile 12 market in Lagos State and were stored for a period of six months. The stability of the iodine content was then investigated by storing some at ambient temperature (24-30oC) and some at atmospheric temperature (21-35 oC), and from each storage condition, a sample each was taken every month to analyze for the iodine and moisture contents. The result shows that there was a significant difference between Mr Chef and the standard and Annapurna and the standard. The iodine content of Mr Chef stored at ambient and atmospheric temperature decreases progressively from 48.70±0.00-37.00±0.00 and 47.60±0.00-11.60±0.00 respectively. And that of Annapurna at both ambient and atmospheric temperature also decreases progressively from 47.60±0.00-36.60±0.00 and 47.60±0.00-10.60±0.00 respectively. Also, the moisture content of both salts at the zero month to the sixth month both at room temperature and atmospheric temperature increases from 1.11±0.00-1.70±0.00 and 1.11±0.00-2.40±0.00 respectively. The results of the heavy metals shows that only Copper, Zinc and Cobalt were detected at the first and the sixth month in both Mr Chef and Annapurna which ranges from 0.15±0.00-0.38±0.00 and 0.18±0.00 - 3.50±0.00 respectively. Hence, the stability of iodine in salt is influenced by the storage conditions it is subjected to and the length of time it is been stored. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=salt" title="salt">salt</a>, <a href="https://publications.waset.org/abstracts/search?q=iodine" title=" iodine"> iodine</a>, <a href="https://publications.waset.org/abstracts/search?q=stability" title=" stability"> stability</a>, <a href="https://publications.waset.org/abstracts/search?q=ambient" title=" ambient"> ambient</a>, <a href="https://publications.waset.org/abstracts/search?q=atmospheric%20temperature" title=" atmospheric temperature"> atmospheric temperature</a> </p> <a href="https://publications.waset.org/abstracts/20724/determination-of-iodine-and-heavy-metals-in-two-brands-of-iodised-salt" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/20724.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">578</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">5320</span> Determination of Direct Solar Radiation Using Atmospheric Physics Models</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Pattra%20Pukdeekiat">Pattra Pukdeekiat</a>, <a href="https://publications.waset.org/abstracts/search?q=Siriluk%20Ruangrungrote"> Siriluk Ruangrungrote</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This work was originated to precisely determine direct solar radiation by using atmospheric physics models since the accurate prediction of solar radiation is necessary and useful for solar energy applications including atmospheric research. The possible models and techniques for a calculation of regional direct solar radiation were challenging and compulsory for the case of unavailable instrumental measurement. The investigation was mathematically governed by six astronomical parameters i.e. declination (δ), hour angle (ω), solar time, solar zenith angle (θz), extraterrestrial radiation (Iso) and eccentricity (E0) along with two atmospheric parameters i.e. air mass (mr) and dew point temperature at Bangna meteorological station (13.67° N, 100.61° E) in Bangkok, Thailand. Analyses of five models of solar radiation determination with the assumption of clear sky were applied accompanied by three statistical tests: Mean Bias Difference (MBD), Root Mean Square Difference (RMSD) and Coefficient of determination (R2) in order to validate the accuracy of obtainable results. The calculated direct solar radiation was in a range of 491-505 Watt/m2 with relative percentage error 8.41% for winter and 532-540 Watt/m2 with relative percentage error 4.89% for summer 2014. Additionally, dataset of seven continuous days, representing both seasons were considered with the MBD, RMSD and R2 of -0.08, 0.25, 0.86 and -0.14, 0.35, 3.29, respectively, which belong to Kumar model for winter and CSR model for summer. In summary, the determination of direct solar radiation based on atmospheric models and empirical equations could advantageously provide immediate and reliable values of the solar components for any site in the region without a constraint of actual measurement. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=atmospheric%20physics%20models" title="atmospheric physics models">atmospheric physics models</a>, <a href="https://publications.waset.org/abstracts/search?q=astronomical%20parameters" title=" astronomical parameters"> astronomical parameters</a>, <a href="https://publications.waset.org/abstracts/search?q=atmospheric%20parameters" title=" atmospheric parameters"> atmospheric parameters</a>, <a href="https://publications.waset.org/abstracts/search?q=clear%20sky%20condition" title=" clear sky condition"> clear sky condition</a> </p> <a href="https://publications.waset.org/abstracts/38352/determination-of-direct-solar-radiation-using-atmospheric-physics-models" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/38352.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">409</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">5319</span> An Experimental (Wind Tunnel) and Numerical (CFD) Study on the Flow over Hills</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Tanit%20Daniel%20Jodar%20Vecina">Tanit Daniel Jodar Vecina</a>, <a href="https://publications.waset.org/abstracts/search?q=Adriane%20Prisco%20Petry"> Adriane Prisco Petry</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The shape of the wind velocity profile changes according to local features of terrain shape and roughness, which are parameters responsible for defining the Atmospheric Boundary Layer (ABL) profile. Air flow characteristics over and around landforms, such as hills, are of considerable importance for applications related to Wind Farm and Turbine Engineering. The air flow is accelerated on top of hills, which can represent a decisive factor for Wind Turbine placement choices. The present work focuses on the study of ABL behavior as a function of slope and surface roughness of hill-shaped landforms, using the Computational Fluid Dynamics (CFD) to build wind velocity and turbulent intensity profiles. Reynolds-Averaged Navier-Stokes (RANS) equations are closed using the SST k-ω turbulence model; numerical results are compared to experimental data measured in wind tunnel over scale models of the hills under consideration. Eight hill models with slopes varying from 25° to 68° were tested for two types of terrain categories in 2D and 3D, and two analytical codes are used to represent the inlet velocity profiles. Numerical results for the velocity profiles show differences under 4% when compared to their respective experimental data. Turbulent intensity profiles show maximum differences around 7% when compared to experimental data; this can be explained by not being possible to insert inlet turbulent intensity profiles in the simulations. Alternatively, constant values based on the averages of the turbulent intensity at the wind tunnel inlet were used. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=Atmospheric%20Boundary%20Layer" title="Atmospheric Boundary Layer">Atmospheric Boundary Layer</a>, <a href="https://publications.waset.org/abstracts/search?q=Computational%20Fluid%20Dynamic%20%28CFD%29" title=" Computational Fluid Dynamic (CFD)"> Computational Fluid Dynamic (CFD)</a>, <a href="https://publications.waset.org/abstracts/search?q=Numerical%20Modeling" title=" Numerical Modeling"> Numerical Modeling</a>, <a href="https://publications.waset.org/abstracts/search?q=Wind%20Tunnel" title=" Wind Tunnel"> Wind Tunnel</a> </p> <a href="https://publications.waset.org/abstracts/66766/an-experimental-wind-tunnel-and-numerical-cfd-study-on-the-flow-over-hills" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/66766.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">380</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">5318</span> New Insights Into Fog Role In Atmospheric Deposition Using Satellite Images</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Suruchi">Suruchi</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This study aims to examine the spatial and temporal patterns of fog occurrences across Czech Republic. It utilizes satellite imagery and other data sources to achieve this goal. The main objective is to understand the role of fog in atmospheric deposition processes and its potential impact on the environment and ecosystems. Through satellite image analysis, the study will identify and categorize different types of fog, including radiation fog, orographic fog, and mountain fog. Fog detection algorithms and cloud type products will be evaluated to assess the frequency and distribution of fog events throughout the Czech Republic. Furthermore, the regions covered by fog will be classified based on their fog type and associated pollution levels. This will provide insights into the variability in fog characteristics and its implications for atmospheric deposition. Spatial analysis techniques will be used to pinpoint areas prone to frequent fog events and evaluate their pollution levels. Statistical methods will be employed to analyze patterns in fog occurrence over time and its connection with environmental factors. The ultimate goal of this research is to offer fresh perspectives on fog's role in atmospheric deposition processes, enhancing our understanding of its environmental significance and informing future research and environmental management initiatives. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=pollution" title="pollution">pollution</a>, <a href="https://publications.waset.org/abstracts/search?q=GIS" title=" GIS"> GIS</a>, <a href="https://publications.waset.org/abstracts/search?q=FOG" title=" FOG"> FOG</a>, <a href="https://publications.waset.org/abstracts/search?q=satellie" title=" satellie"> satellie</a>, <a href="https://publications.waset.org/abstracts/search?q=atmospheric%20deposition" title=" atmospheric deposition"> atmospheric deposition</a> </p> <a href="https://publications.waset.org/abstracts/191540/new-insights-into-fog-role-in-atmospheric-deposition-using-satellite-images" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/191540.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">22</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">5317</span> Optimizing the Efficiency of Measuring Instruments in Ouagadougou-Burkina Faso</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Moses%20Emetere">Moses Emetere</a>, <a href="https://publications.waset.org/abstracts/search?q=Marvel%20Akinyemi"> Marvel Akinyemi</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20E.%20Sanni"> S. E. Sanni</a> </p> <p class="card-text"><strong>Abstract:</strong></p> At the moment, AERONET or AMMA database shows a large volume of data loss. With only about 47% data set available to the scientist, it is evident that accurate nowcast or forecast cannot be guaranteed. The calibration constants of most radiosonde or weather stations are not compatible with the atmospheric conditions of the West African climate. A dispersion model was developed to incorporate salient mathematical representations like a Unified number. The Unified number was derived to describe the turbulence of the aerosols transport in the frictional layer of the lower atmosphere. Fourteen years data set from Multi-angle Imaging SpectroRadiometer (MISR) was tested using the dispersion model. A yearly estimation of the atmospheric constants over Ouagadougou using the model was obtained with about 87.5% accuracy. It further revealed that the average atmospheric constant for Ouagadougou-Niger is a_1 = 0.626, a_2 = 0.7999 and the tuning constants is n_1 = 0.09835 and n_2 = 0.266. Also, the yearly atmospheric constants affirmed the lower atmosphere of Ouagadougou is very dynamic. Hence, it is recommended that radiosonde and weather station manufacturers should constantly review the atmospheric constant over a geographical location to enable about eighty percent data retrieval. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=aerosols%20retention" title="aerosols retention">aerosols retention</a>, <a href="https://publications.waset.org/abstracts/search?q=aerosols%20loading" title=" aerosols loading"> aerosols loading</a>, <a href="https://publications.waset.org/abstracts/search?q=statistics" title=" statistics"> statistics</a>, <a href="https://publications.waset.org/abstracts/search?q=analytical%20technique" title=" analytical technique"> analytical technique</a> </p> <a href="https://publications.waset.org/abstracts/55320/optimizing-the-efficiency-of-measuring-instruments-in-ouagadougou-burkina-faso" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/55320.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">315</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">5316</span> AI/ML Atmospheric Parameters Retrieval Using the “Atmospheric Retrievals conditional Generative Adversarial Network (ARcGAN)”</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Thomas%20Monahan">Thomas Monahan</a>, <a href="https://publications.waset.org/abstracts/search?q=Nicolas%20Gorius"> Nicolas Gorius</a>, <a href="https://publications.waset.org/abstracts/search?q=Thanh%20Nguyen"> Thanh Nguyen</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Exoplanet atmospheric parameters retrieval is a complex, computationally intensive, inverse modeling problem in which an exoplanet’s atmospheric composition is extracted from an observed spectrum. Traditional Bayesian sampling methods require extensive time and computation, involving algorithms that compare large numbers of known atmospheric models to the input spectral data. Runtimes are directly proportional to the number of parameters under consideration. These increased power and runtime requirements are difficult to accommodate in space missions where model size, speed, and power consumption are of particular importance. The use of traditional Bayesian sampling methods, therefore, compromise model complexity or sampling accuracy. The Atmospheric Retrievals conditional Generative Adversarial Network (ARcGAN) is a deep convolutional generative adversarial network that improves on the previous model’s speed and accuracy. We demonstrate the efficacy of artificial intelligence to quickly and reliably predict atmospheric parameters and present it as a viable alternative to slow and computationally heavy Bayesian methods. In addition to its broad applicability across instruments and planetary types, ARcGAN has been designed to function on low power application-specific integrated circuits. The application of edge computing to atmospheric retrievals allows for real or near-real-time quantification of atmospheric constituents at the instrument level. Additionally, edge computing provides both high-performance and power-efficient computing for AI applications, both of which are critical for space missions. With the edge computing chip implementation, ArcGAN serves as a strong basis for the development of a similar machine-learning algorithm to reduce the downlinked data volume from the Compact Ultraviolet to Visible Imaging Spectrometer (CUVIS) onboard the DAVINCI mission to Venus. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=deep%20learning" title="deep learning">deep learning</a>, <a href="https://publications.waset.org/abstracts/search?q=generative%20adversarial%20network" title=" generative adversarial network"> generative adversarial network</a>, <a href="https://publications.waset.org/abstracts/search?q=edge%20computing" title=" edge computing"> edge computing</a>, <a href="https://publications.waset.org/abstracts/search?q=atmospheric%20parameters%20retrieval" title=" atmospheric parameters retrieval"> atmospheric parameters retrieval</a> </p> <a href="https://publications.waset.org/abstracts/143382/aiml-atmospheric-parameters-retrieval-using-the-atmospheric-retrievals-conditional-generative-adversarial-network-arcgan" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/143382.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">170</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">5315</span> Atmospheric Circulation Types Related to Dust Transport Episodes over Crete in the Eastern Mediterranean</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=K.%20Alafogiannis">K. Alafogiannis</a>, <a href="https://publications.waset.org/abstracts/search?q=E.%20E.%20Houssos"> E. E. Houssos</a>, <a href="https://publications.waset.org/abstracts/search?q=E.%20Anagnostou"> E. Anagnostou</a>, <a href="https://publications.waset.org/abstracts/search?q=G.%20Kouvarakis"> G. Kouvarakis</a>, <a href="https://publications.waset.org/abstracts/search?q=N.%20Mihalopoulos"> N. Mihalopoulos</a>, <a href="https://publications.waset.org/abstracts/search?q=A.%20Fotiadi"> A. Fotiadi</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The Mediterranean basin is an area where different aerosol types coexist, including urban/industrial, desert dust, biomass burning and marine particles. Particularly, mineral dust aerosols, mostly originated from North African deserts, significantly contribute to high aerosol loads above the Mediterranean. Dust transport, controlled by the variation of the atmospheric circulation throughout the year, results in a strong spatial and temporal variability of aerosol properties. In this study, the synoptic conditions which favor dust transport over the Eastern Mediterranean are thoroughly investigated. For this reason, three datasets are employed. Firstly, ground-based daily data of aerosol properties, namely Aerosol Optical Thickness (AOT), Ångström exponent (α440-870) and fine fraction from the FORTH-AERONET (Aerosol Robotic Network) station along with measurements of PM10 concentrations from Finokalia station, for the period 2003-2011, are used to identify days with high coarse aerosol load (episodes) over Crete. Then, geopotential height at 1000, 850 and 700 hPa levels obtained from the NCEP/NCAR Reanalysis Project, are utilized to depict the atmospheric circulation during the identified episodes. Additionally, air-mass back trajectories, calculated by HYSPLIT, are used to verify the origin of aerosols from neighbouring deserts. For the 227 identified dust episodes, the statistical methods of Factor and Cluster Analysis are applied on the corresponding atmospheric circulation data to reveal the main types of the synoptic conditions favouring dust transport towards Crete (Eastern Mediterranean). The 227 cases are classified into 11 distinct types (clusters). Dust episodes in Eastern Mediterranean, are found to be more frequent (52%) in spring with a secondary maximum in autumn. The main characteristic of the atmospheric circulation associated with dust episodes, is the presence of a low-pressure system at surface, either in southwestern Europe or western/central Mediterranean, which induces a southerly air flow favouring dust transport from African deserts. The exact position and the intensity of the low-pressure system vary notably among clusters. More rarely dust may originate from deserts of Arabian Peninsula. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=aerosols" title="aerosols">aerosols</a>, <a href="https://publications.waset.org/abstracts/search?q=atmospheric%20circulation" title=" atmospheric circulation"> atmospheric circulation</a>, <a href="https://publications.waset.org/abstracts/search?q=dust%20particles" title=" dust particles"> dust particles</a>, <a href="https://publications.waset.org/abstracts/search?q=Eastern%20Mediterranean" title=" Eastern Mediterranean"> Eastern Mediterranean</a> </p> <a href="https://publications.waset.org/abstracts/63484/atmospheric-circulation-types-related-to-dust-transport-episodes-over-crete-in-the-eastern-mediterranean" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/63484.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">230</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">5314</span> Flow Duration Curve Method to Evaluate Environmental Flow: Case Study of Gharasou River, Ardabil, Iran</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Mehdi%20Fuladipanah">Mehdi Fuladipanah</a>, <a href="https://publications.waset.org/abstracts/search?q=Mehdi%20Jorabloo"> Mehdi Jorabloo</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Water flow management is one of the most important parts of river engineering. Non-uniformity distribution of rainfall and various flow demand with unreasonable flow management will be caused destroyed of river ecosystem. Then, it is very serious to determine ecosystem flow requirement. In this paper, flow duration curve indices method which has hydrological based was used to evaluate environmental flow in Gharasou River, Ardabil, Iran. Using flow duration curve, Q90 and Q95 for different return periods were calculated. Their magnitude were determined as 1-day, 3-day, 7-day, and 30 day. According the second method, hydraulic alteration indices often had low and medium range. In order to maintain river at an acceptable ecological condition, minimum daily discharge of index Q95 is 0.7 m3.s-1. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=ardabil" title="ardabil">ardabil</a>, <a href="https://publications.waset.org/abstracts/search?q=environmental%20flow" title=" environmental flow"> environmental flow</a>, <a href="https://publications.waset.org/abstracts/search?q=flow%20duration%20curve" title=" flow duration curve"> flow duration curve</a>, <a href="https://publications.waset.org/abstracts/search?q=Gharasou%20river" title=" Gharasou river"> Gharasou river</a> </p> <a href="https://publications.waset.org/abstracts/22653/flow-duration-curve-method-to-evaluate-environmental-flow-case-study-of-gharasou-river-ardabil-iran" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/22653.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">683</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">5313</span> Atmospheric Pressure Microwave Plasma System and Its Applications </h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Waqas%20A.%20Toor">Waqas A. Toor</a>, <a href="https://publications.waset.org/abstracts/search?q=Anis%20U.%20Baig"> Anis U. Baig</a>, <a href="https://publications.waset.org/abstracts/search?q=Nuaman%20Shafqat"> Nuaman Shafqat</a>, <a href="https://publications.waset.org/abstracts/search?q=Raafia%20Irfan"> Raafia Irfan</a>, <a href="https://publications.waset.org/abstracts/search?q=Muhammad%20Ashraf"> Muhammad Ashraf</a> </p> <p class="card-text"><strong>Abstract:</strong></p> A 2.45GHz microwave plasma system and its few applications have been developed. Argon and helium plasma is produced by metallic nozzle and also in a quartz tube at atmospheric pressure, using WR-340 waveguide and its tapered version. The waveguide applicator is also simulated in HFSS and field patterns are analyzed for maximum power absorption in the load. The system is tuned to operate at less than 10% reflected power. Various experimental techniques are used to initiate and sustain the plasma at atmospheric pressure. Plasma of atmospheric air is also produced without using any other shielding gas. The plasma flame is also characterized by its spectrum. Spectral analyses of plasma flame can be used for online analysis of combustion gases produced in industry. The applications of the system include glass and quartz processing, vitrification, emission spectroscopy, plasma coating. Low pressure plasma applications of the system include intense UV light for water purification and ozone generation. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=HFSS%20high%20frequency%20structure%20simulator" title="HFSS high frequency structure simulator">HFSS high frequency structure simulator</a>, <a href="https://publications.waset.org/abstracts/search?q=Microwave%20plasma" title=" Microwave plasma"> Microwave plasma</a>, <a href="https://publications.waset.org/abstracts/search?q=UV%20ultraviolet" title=" UV ultraviolet"> UV ultraviolet</a>, <a href="https://publications.waset.org/abstracts/search?q=WR%20rectangular%20waveguide" title=" WR rectangular waveguide"> WR rectangular waveguide</a> </p> <a href="https://publications.waset.org/abstracts/91066/atmospheric-pressure-microwave-plasma-system-and-its-applications" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/91066.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">271</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">5312</span> Utilizing Waste Heat from Thermal Power Plants to Generate Power by Modelling an Atmospheric Vortex Engine</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Mohammed%20Nabeel%20Khan">Mohammed Nabeel Khan</a>, <a href="https://publications.waset.org/abstracts/search?q=C.%20Perisamy"> C. Perisamy </a> </p> <p class="card-text"><strong>Abstract:</strong></p> Convective vortices are normal highlights of air that ingest lower-entropy-energy at higher temperatures than they dismiss higher-entropy-energy to space. By means of the thermodynamic proficiency, it has been anticipated that the force of convective vortices relies upon the profundity of the convective layer. The atmospheric vortex engine is proposed as a gadget for delivering mechanical energy by methods for artificially produced vortex. The task of the engine is in view of the certainties that the environment is warmed from the base and cooled from the top. By generation of the artificial vortex, it is planned to take out the physical solar updraft tower and decrease the capital of the solar chimney power plants. The study shows the essentials of the atmospheric vortex engine, furthermore, audits the cutting edge in subject. Moreover, the study talks about a thought on using the solar energy as heat source to work the framework. All in all, the framework is attainable and promising for electrical power production. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=AVE" title="AVE">AVE</a>, <a href="https://publications.waset.org/abstracts/search?q=atmospheric%20vortex%20engine" title=" atmospheric vortex engine"> atmospheric vortex engine</a>, <a href="https://publications.waset.org/abstracts/search?q=atmosphere" title=" atmosphere"> atmosphere</a>, <a href="https://publications.waset.org/abstracts/search?q=updraft" title=" updraft"> updraft</a>, <a href="https://publications.waset.org/abstracts/search?q=vortex" title=" vortex"> vortex</a> </p> <a href="https://publications.waset.org/abstracts/102553/utilizing-waste-heat-from-thermal-power-plants-to-generate-power-by-modelling-an-atmospheric-vortex-engine" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/102553.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">161</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">5311</span> Investigation Effect of External Flow to Exhaust Gas Flow at Heavy Commercial Vehicle with CFD</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=F.%20Kanta%C5%9F">F. Kantaş</a>, <a href="https://publications.waset.org/abstracts/search?q=D.%20Boyac%C4%B1"> D. Boyacı</a>, <a href="https://publications.waset.org/abstracts/search?q=C.%20Din%C3%A7"> C. Dinç </a> </p> <p class="card-text"><strong>Abstract:</strong></p> Exhaust systems plays an important role in thermal heat management. Exhaust manifold picks burned gas from engine and exhaust pipes transmit exhaust gas to muffler, exhaust gas is reacted chemically to avoid noxious gas and sound is reduced in muffler then gas is threw out with tail pipe from muffler. Exhaust gas flows out from tail pipe and this hot gas flows to many parts that available around tail pipe and muffler, like spare tire, transmission, pipes etc. These parts are heated by hot exhaust gas. Also vehicle on ride, external flow effects exhaust gas flow and exhaust gas behavior is changed. It's impossible to understand which parts are heated by hot exhaust gas in tests. To understand this phenomena, exhaust gas flow is solved in CFD also external flow due to vehicle movement must be solved with exhaust gas flow. Because external flow effects exhaust gas flow behavior with many parameters. This paper investigates external flow effects exhaust gas flow behavior and other critical parameters effect exhaust gas flow behavior, like different tail pipe design, exhaust gas mass flow in critic vehicle driving situations. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=exhaust" title="exhaust">exhaust</a>, <a href="https://publications.waset.org/abstracts/search?q=gas%20flow" title=" gas flow"> gas flow</a>, <a href="https://publications.waset.org/abstracts/search?q=vehicle" title=" vehicle"> vehicle</a>, <a href="https://publications.waset.org/abstracts/search?q=external%20flow" title=" external flow "> external flow </a> </p> <a href="https://publications.waset.org/abstracts/17975/investigation-effect-of-external-flow-to-exhaust-gas-flow-at-heavy-commercial-vehicle-with-cfd" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/17975.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">448</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">5310</span> Measurement of Reverse Flow Generated at Cold Exit of Vortex Tube </h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Mohd%20Hazwan%20bin%20Yusof">Mohd Hazwan bin Yusof</a>, <a href="https://publications.waset.org/abstracts/search?q=Hiroshi%20Katanoda"> Hiroshi Katanoda</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In order to clarify the structure of the cold flow discharged from the vortex tube (VT), the pressure of the cold flow was measured, and a simple flow visualization technique using a 0.75 mm-diameter needle and an oily paint is made to study the reverse flow at the cold exit. It is clear that a negative pressure and positive pressure region exist at a certain pressure and cold fraction area, and that a reverse flow is observed in the negative pressure region. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=flow%20visualization" title="flow visualization">flow visualization</a>, <a href="https://publications.waset.org/abstracts/search?q=pressure%20measurement" title=" pressure measurement"> pressure measurement</a>, <a href="https://publications.waset.org/abstracts/search?q=reverse%20flow" title=" reverse flow"> reverse flow</a>, <a href="https://publications.waset.org/abstracts/search?q=vortex%20tube" title=" vortex tube"> vortex tube</a> </p> <a href="https://publications.waset.org/abstracts/10289/measurement-of-reverse-flow-generated-at-cold-exit-of-vortex-tube" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/10289.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">519</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">5309</span> Rapid Atmospheric Pressure Photoionization-Mass Spectrometry (APPI-MS) Method for the Detection of Polychlorinated Dibenzo-P-Dioxins and Dibenzofurans in Real Environmental Samples Collected within the Vicinity of Industrial Incinerators</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=M.%20Amo">M. Amo</a>, <a href="https://publications.waset.org/abstracts/search?q=A.%20Alvaro"> A. Alvaro</a>, <a href="https://publications.waset.org/abstracts/search?q=A.%20Astudillo"> A. Astudillo</a>, <a href="https://publications.waset.org/abstracts/search?q=R.%20Mc%20Culloch"> R. Mc Culloch</a>, <a href="https://publications.waset.org/abstracts/search?q=J.%20C.%20del%20Castillo"> J. C. del Castillo</a>, <a href="https://publications.waset.org/abstracts/search?q=M.%20G%C3%B3mez"> M. Gómez</a>, <a href="https://publications.waset.org/abstracts/search?q=J.%20M.%20Mart%C3%ADn"> J. M. Martín</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) of course comprise a range of highly toxic compounds that may exist as particulates within the air or accumulate within water supplies, soil, or vegetation. They may be created either ubiquitously or naturally within the environment as a product of forest fires or volcanic eruptions. It is only since the industrial revolution, however, that it has become necessary to closely monitor their generation as a byproduct of manufacturing/combustion processes, in an effort to mitigate widespread contamination events. Of course, the environmental concentrations of these toxins are expected to be extremely low, therefore highly sensitive and accurate methods are required for their determination. Since ionization of non-polar compounds through electrospray and APCI is difficult and inefficient, we evaluate the performance of a novel low-flow Atmospheric Pressure Photoionization (APPI) source for the trace detection of various dioxins and furans using rapid Mass Spectrometry workflows. Air, soil and biota (vegetable matter) samples were collected monthly during one year from various locations within the vicinity of an industrial incinerator in Spain. Analytes were extracted and concentrated using soxhlet extraction in toluene and concentrated by rotavapor and nitrogen flow. Various ionization methods as electrospray (ES) and atmospheric pressure chemical ionization (APCI) were evaluated, however, only the low-flow APPI source was capable of providing the necessary performance, in terms of sensitivity, required for detecting all targeted analytes. In total, 10 analytes including 2,3,7,8-tetrachlorodibenzodioxin (TCDD) were detected and characterized using the APPI-MS method. Both PCDDs and PCFDs were detected most efficiently in negative ionization mode. The most abundant ion always corresponded to the loss of a chlorine and addition of an oxygen, yielding [M-Cl+O]- ions. MRM methods were created in order to provide selectivity for each analyte. No chromatographic separation was employed; however, matrix effects were determined to have a negligible impact on analyte signals. Triple Quadrupole Mass Spectrometry was chosen because of its unique potential for high sensitivity and selectivity. The mass spectrometer used was a Sciex´s Qtrap3200 working in negative Multi Reacting Monitoring Mode (MRM). Typically mass detection limits were determined to be near the 1-pg level. The APPI-MS2 technology applied to the detection of PCDD/Fs allows fast and reliable atmospheric analysis, minimizing considerably operational times and costs, with respect other technologies available. In addition, the limit of detection can be easily improved using a more sensitive mass spectrometer since the background in the analysis channel is very low. The APPI developed by SEADM allows polar and non-polar compounds ionization with high efficiency and repeatability. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=atmospheric%20pressure%20photoionization-mass%20spectrometry%20%28APPI-MS%29" title="atmospheric pressure photoionization-mass spectrometry (APPI-MS)">atmospheric pressure photoionization-mass spectrometry (APPI-MS)</a>, <a href="https://publications.waset.org/abstracts/search?q=dioxin" title=" dioxin"> dioxin</a>, <a href="https://publications.waset.org/abstracts/search?q=furan" title=" furan"> furan</a>, <a href="https://publications.waset.org/abstracts/search?q=incinerator" title=" incinerator"> incinerator</a> </p> <a href="https://publications.waset.org/abstracts/57008/rapid-atmospheric-pressure-photoionization-mass-spectrometry-appi-ms-method-for-the-detection-of-polychlorinated-dibenzo-p-dioxins-and-dibenzofurans-in-real-environmental-samples-collected-within-the-vicinity-of-industrial-incinerators" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/57008.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">208</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">5308</span> Learning Materials of Atmospheric Pressure Plasma Process: Application in Wrinkle-Resistant Finishing of Cotton Fabric</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=C.%20W.%20Kan">C. W. Kan</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Cotton fibre is a commonly-used natural fibre because of its good fibre strength, high moisture absorption behaviour and minimal static problems. However, one of the main drawbacks of cotton fibre is wrinkling after washing, which is recently overcome by wrinkle-resistant treatment. 1,2,3,4-butanetetracarboxylic acid (BTCA) could improve the wrinkle-resistant properties of cotton fibre. Although the BTCA process is an effective method for wrinkle resistant application of cotton fabrics, reduced fabric strength was observed after treatment. Therefore, this paper would explore the use of atmospheric pressure plasma treatment under different discharge powers as a pretreatment process to enhance the application of BTCA process on cotton fabric without generating adverse effect. The aim of this study is to provide learning information to the users to know how the atmospheric pressure plasma treatment can be incorporated in textile finishing process with positive impact. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=learning%20materials" title="learning materials">learning materials</a>, <a href="https://publications.waset.org/abstracts/search?q=atmospheric%20pressure%20plasma%20treatment" title=" atmospheric pressure plasma treatment"> atmospheric pressure plasma treatment</a>, <a href="https://publications.waset.org/abstracts/search?q=cotton" title=" cotton"> cotton</a>, <a href="https://publications.waset.org/abstracts/search?q=wrinkle-resistant" title=" wrinkle-resistant"> wrinkle-resistant</a>, <a href="https://publications.waset.org/abstracts/search?q=BTCA" title=" BTCA"> BTCA</a> </p> <a href="https://publications.waset.org/abstracts/49532/learning-materials-of-atmospheric-pressure-plasma-process-application-in-wrinkle-resistant-finishing-of-cotton-fabric" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/49532.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">305</span> </span> </div> </div> <ul class="pagination"> <li class="page-item disabled"><span class="page-link">&lsaquo;</span></li> <li class="page-item active"><span class="page-link">1</span></li> <li class="page-item"><a class="page-link" href="https://publications.waset.org/abstracts/search?q=atmospheric%20flow&page=2">2</a></li> <li class="page-item"><a class="page-link" href="https://publications.waset.org/abstracts/search?q=atmospheric%20flow&page=3">3</a></li> <li class="page-item"><a class="page-link" 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