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Experimental study on Vacuum evaporation by ejector of fresh water generator system
S. Wibowo(위보워),ZhenHua Zin(김진화),J.S. Woo(우주식),H. M. Jeong(정효민),H. S. Chung(정한식) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.11
담수와 시스템은 염수를 음용수로 만들기 위해 해수에 열을 가하는 형태로 설계된다. 본 논문에서는 진공 튜브 증발을 하는 한 가지 형태의 청수제조장치의 진공튜브내의 특성을 알아보았다. 담수에 필요한 열에너지는 증류법을 이용하여 비등점을 내릴 수 있다. 이 실험에서는 증발기로 보내는 물의 온도는 60~90로 제어하여 실험하였다. 이는 버려지는 저압의 스팀과 같은 에너지를 이용하여 담수화 시스템을 구성할 수 있다.
Study of Steam Ejector in Experimental and Numerical
S. Wibowo(위보워),M. Sq. Rahman(라흐만),G. H. Lee(이경환),H. M. Jeong(정효민),H. S. Chung(정한식) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.6
Steam jet ejectors are essential part in many industrial applications such as refrigeration and air conditioning, desalination, chemical industries, and so on. In this study, experiment and numerical of jet ejector model were investigated to reveal the complication of the flow and the mixing process in a steam ejector. Air was used as primary and secondary fluids in experiment. In the experiment, the influence of nozzle exit positions was investigated. The result shows the static pressure distribution along the ejector wall is influenced by nozzle exit position. We also carried out CFD simulation in this study. Realizable k-epsilon turbulence model was tested in CFD. The CFD results were validated with available experimental data.
Numerical and Experimental Study on the Steam Ejector
S. Wibowo(위보워),M. Sq. Rahman(라흐만),J. S. Woo(우주식),H. M. Jeong(정효민),H. S. Chung(정한식) 한국마린엔지니어링학회 2009 한국마린엔지니어링학회 학술대회 논문집 Vol.2009 No.-
Ejectors are simple pieces of equipment. They are employed in the industry such as in refrigeration and air conditioning, desalination, petrochemical and chemical industry. The purpose of this paper is to reveal the complication of the flow and the mixing process in a steam ejector. Air was used as primary and secondary fluids here. In this experiment, the influence of nozzle exit positions was investigated. The result shows the static pressure distribution along the ejector wall is influenced by nozzle exit position. In this study CFD simulation were also undertaken. Standard k-epsilon, RNG k-epsilon, and Realizable k-epsilon were tested in CFD. The CFD results were validated with available experimental data. In this case the result shows that realizable k-epsilon model closer with experimental result than another models.
Experimental Study on Fresh Water Generation System with Low Pressure Evaporation
정한식(Hanshik Chung),위보워(S. Wibowo),리야드(Md. Riyad Tanshen),최주호(Juho Choi),정효민(Hyomin Jeong) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.4
In this study, experiment of fresh water generation with effect of vacuuming in evaporator was conducted to investigate the effect of various parameters on pressure and temperature distribution inside evaporator, and fresh water or condensed vapor collected from the system. The results of this study show that temperature and flow rateof feed water to the evaporator, and orifice diameter are important factors affecting pressure and temperature inside evaporator, and amount of condensed vapor yield. Varieties of feed water temperature and flow rate are 40-80 0C and 200-400 ㎖/min respectively. From this study shows also that it is possible to use non-conventional energy sources such as lower pressure waste steam for heating feed water to the evaporator of fresh water generation system.
Study on the Flow Characteristics in the Channel with Corrugated Wall
YongHan Shin(신용한),ZhenHua Jin(김진화),S. Wibowo(위보워),Li XueSong(이설송),HanShik Chung(정한식),HyoMin Jeong(정효민) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.11
In this paper, presented pressure drop characteristics in a channel of plate heat exchanger by experimental method. Plate Heat Exchanger(PHE) have become popular in chemical, power, food and refrigeration industries due to the efficient heat transfer performances, extremely compact design and flexibility of extend or modify to suit changed duty. In the experiment, test section constructed by two corrugated plates with 60 degree of chevron angle. Consequently, experiments carried out the pressure profile along 15 measure points according to mass flow rate. This results provided to investigate flow characteristics of PHE channel flow that highly turbulent even with low Reynolds number. Moreover, numerical simulation was compared with experimental results and present flow behavior in the test section.
Pressure Features in 3_arm steel pipe in Reciprocating Hydrogen Compression System
M. Sq. Rahaman(라흐만),G. H. Lee(이경환),S. Wibowo(위보워),J. S. Woo(우주식),H. M Jeong(정효민),H. S. Chung(정한식) 한국마린엔지니어링학회 2009 한국마린엔지니어링학회 학술대회 논문집 Vol.2009 No.-
Compressing system is essential parts of hydrogen economy. High pulsation waveforms produced during hydrogen compression can be reduced by employing snubber in the system. There aresome pipes to flow hydrogen between snubbers. An experiment has been conducted to investigate the features of pressure in the pipe placed between snubbers in reciprocating compression system. The 32.6970 ~ 53.1210% pressure pulsation reductions are found with pressure losses 0.1092 ~ 1.4413% by experiment and detail of pressure are obtained by CFD analysis.