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A CFD Analysis on Hydrodynamics Characteristics of Gas-Liquid Ejector
Tony Suryo Utomo,Jin Zhenhua,ChungSeub Yi,Hyo Min Jeong,Han Shik Chung 한국동력기계공학회 2006 한국동력기계공학회 학술대회 논문집 Vol.- No.-
A CFD investigation on hydrodynamics characteristics of gas liquid ejector has been carried out to study the influence of gas liquid flow rates ratio on the performance and on the mass transfer characteristic of ejector. In this study, the ejector design was modeled using finite volume CFD techniques to resolve the flow dynamics in the ejectors. The CFD results were validated with available experimental data. Flow field analyses and predictions of ejector performance were also carried out. During validation, although there is a discrepancy between CFD and experimental results, however it has a good agreement in the trend of phenomena respect to experimental results. From the present analysis, it can be concluded that the efficiency of the ejector increases with respect to gas liquid flow rates ratio. It also can be seen that the volumetric mass transfer coefficient is higher when the gas flow rate increased.
Tony Utomo,Zhenhua Jin,MSq Rahman,정효민,정한식 대한기계학회 2008 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.22 No.9
An investigation of the gas-liquid ejector has been carried out to study the influence of operating conditions and ejector geometries on the hydrodynamics and mass transfer characteristics of the ejector by using three-dimensional CFD modeling. The CFD results were validated with experimental data. Flow field analysis and prediction of ejector performance were also conducted. Variations of the operating conditions were made by changing the gas-liquid flow rates ratio in the range of 0.2 to 1.2. The length to diameter ratio of mixing tube (LM/DM) was also varied from 4 to 10. CFD studies show that at LM/DM=5.5, the volumetric mass transfer coefficient increases with respect to gas flow rate. Meanwhile, at LM/DM=4, the plot of volumetric mass transfer coefficient to gas-liquid flow rate ratio reaches the maximum at gas-liquid flow rate ratio of 0.6. This study also shows that volumetric mass transfer coefficient decreases with the increase of mixing tube length.
A CFD Study on the Hydrodynamics Characteristics of Steam Ejectors
Tony Utomo,MSq Rahman,Myong Kuk Ji,Hyo Min Jeong,Han Shik Chung 한국마린엔지니어링학회 2008 한국마린엔지니어링학회 학술대회 논문집 Vol.2008 No.-
In this research, a study on the hydrodynamics characteristics of ejectors operated in Multi Effect Desalination was conducted by using Computational Fluid Dynamics. The objectives are to compare the performance and to study the flow phenomena inside of these ejectors. The study also focused on the influence of converging duct angle on the performance of constant-pressure mixing ejectors. The converging duct angle was varied at 0.5°, 1°, 2°, 3.5° and 4.5°. The results show the constant-pressure mixing ejector gives higher entrainment ratio than constant-area mixing ejector. The constant-pressure mixing ejector equipped with converging duct angle of 1° gives the highest entrainment ratio.
Tony Utomo,Zen Hua Jin,Chung Seub Yi,Hyo Min Jeong,Han Shik Chung 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
The purpose of this paper is to study the influence of operating condition and ejector geometries on the hydrodynamics and on the mass transfer characteristic of ejector. The CFD results were validated with available experimental data. Flow field analyses and predictions of ejector performance were also carried out. Variation on the operating conditions was made by varying the gas-liquid flow rate ratio in the range of 0.2 to 1.2. The ejector configuration was also varied on the length to diameter ratio of mixing tube (L<SUB>M</SUB>/D<SUB>M</SUB>) in the range of 4 to 10. CFD studies show that at L<SUB>M</SUB>/D<SUB>M</SUB> 5.5, the volumetric mass transfer coefficient increases with respect to gas flow rates. Meanwhile, at L<SUB>M</SUB>/D<SUB>M</SUB> 4, the plot of volumetric mass transfer coefficient to gas-liquid flow rates ratio reach maximum at gas-liquid flow rates ratio of 0.6. This study also shows that volumetric mass transfer coefficient decrease with respect to the increase of mixing tube length.
Tony Suryo Utomo,Jin Zhenhua,ChungSeub Yi,Hyo Min Jeong,Han Shik Chung 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
An investigation on hydrodynamics characteristics of gas liquid ejector has been carried out using to study the influence of gas liquid flow rates ratio on the performance and on the mass transfer characteristic of ejector. In this study, the ejector design was modeled using finite volume CFD techniques to resolve the flow dynamics in the ejectors. The CFD results were validated with available experimental data. Flow field analyses and predictions of ejector performance were also carried out. During validation, although there is a discrepancy between CFD and experimental results, however it has a good agreement in the trend of phenomena respect to experimental results. From the present analysis, it can be concluded that the efficiency of the ejector increases with respect to gas liquid flow rates ratio. It also can be seen that the volumetric mass transfer coefficient is higher when the gas flow rate increased.
A CFD Study on the Hydrodynamics Characteristics of Steam Ejectors
Tony Utomo,MSq,Rahman,Myong Kuk Ji,Hyo Min Jeong,Han Shik Chung 한국항해항만학회 2008 한국항해항만학회 학술대회논문집 Vol.2008 No.공동학술
In this research, a study on the hydrodynamics characteristics of ejectors operated in Multi Effect Desalination was conducted by using Computational Fluid Dynamics. The objectives are to compare the performance and to study the flow phenomena inside of these ejectors. The study also focused on the influence of converging duct angle on the performance of constant-pressure mixing ejectors. The converging duct angle was varied at 0.5º, 1º, 2º, 3.5º and 4.5º. The results show the constant-pressure mixing ejector gives higher entrainment ratio than constant-area mixing ejector. The constant-pressure mixing ejector equipped with converging duct angle of 1ºgives the highest entrainment ratio.
Design analysis of a bubble pump on diffusion absorption refrigeration system
Tony suryo Utomo,Hyo Min Jeong(정효민),Han Shik Chung(정한식) 한국동력기계공학회 2006 한국동력기계공학회 학술대회 논문집 Vol.- No.-
An analytical study of a bubble pump has been done in this research with theoretical approach to investigate the performance of the bubble pump. The bubble pump was used in the absorption refrigeration system with ammonia-water-hydrogen as the working fluid. Bubble pump tube diameter, submergence ratio, heat input are varied to analyze the bubble pump performance. The results indicate that the efficiency is practically independent of the heat input and nearly independent of diameter, but increases with increase in submergence ratio. The pumping ratio is practically independent of heat input, but increases with decrease in bubble pump tube diameter and increase in submergence ratio. The liquid mass flow rate depends on heat input and submergence ratio, but it is practically independent of the bubble pump diameter.
A CFD Analysis on the Gas-Liquid Ejector
Tony Utomo,Jn Zhenhua,ChungSueb Yi,Hyo Min Jeong,Han Shik Chung 한국동력기계공학회 2007 한국동력기계공학회 학술대회 논문집 Vol.- No.-
An analysis on the gas-liquid ejector has been carried out using three-dimensional CFD modeling. The purpose of this paper is to study the influence of operating condition and ejector geometries on the hydrodynamics and on the mass transfer characteristic of ejector. The CFD results were validated with available experimental data. Flow field analyses and predictions of ejector performance were also carried out. Variation on the operating conditions was made by varying the gas-liquid flow rate ratio in the range of 0.2 to 1.2. The length to diameter ratio of mixing tube (LM/DM) also varied in the range of 4 to 10. CFD studies show that at LM/DM 5.5, the volumetric mass transfer coefficient increases with respect to gas flow rates. Meanwhile, at LM/DM 4, the plot of volumetric mass transfer coefficient to gas-liquid flow rates ratio reach maximum at gas-liquid flow rates ratio of 0.6. This study also shows that volumetric mass transfer coefficient decrease with respect to the increase of mixing tube length.
정효민,Tony Utomo,지명국,이용훈,이경환,정한식 대한기계학회 2009 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.23 No.9
A thermo vapor compressor is simply a steam ejector employed in a multi effect desalination process. A greater understanding of flow phenomena inside an ejector plays an important role in its performance improvement. In this paper, CFD investigation has been carried out to study the flow structure inside a steam ejector. This research revealed the influence of operating pressures and ejector geometries on the flow structure and the performance of a steam ejector. The CFD results were verified with available experimental data. The angle of the converging duct as the geometry parameter was varied as 0°, 0.5°, 1°, 2°, 3.5° and 4.5°. The best performance was obtained by the ejector with converging duct angle of 1°.
CFD Study Analysis on the Steam Ejector with Varying Turbulence models
Supriyanto Wibowo,Tony Utomo,HanSik Chung,HyoMin Jeong 대한설비공학회 2008 대한설비공학회 학술발표대회논문집 Vol.2008 No.2
CFD analysis has been carried out in this paper. The purpose is to reveal the understanding of flow phenomena inside the ejector on the performance of steam ejector using three well known turbulence models. In this study, the ejector design was modeled using finite area CFD techniques to resolve the flow dynamics in the ejectors. Furthermore, from this study it can be concluded that by employed vary of turbulence models there are different results in pressure distribution, in contour of Mach number and in Entrainment ratio inside the steam ejector.