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보텍스튜브 유동의 에너지분리 및 열역학특성에 관한 수치적 연구
최훈기(H.K. Choi),유근종(G.J. Yoo),임윤승(Y.S. Lim) 한국전산유체공학회 2018 한국전산유체공학회지 Vol.23 No.2
A vortex tube is a simple energy separating device which splits a compressed air stream into a cold and hot stream without any external energy supply or chemical reactions. In this article computational fluid dynamics analysis of a 3-D steady state and turbulent flow has been carried out through a vortex tube. The present research has focused on the energy separation and thermodynamic behavior of a vortex tube have been investigated. The temperature separation occurs because of the heat transfer from the central flow to the peripheral flow. Through the interpretation of the second law of thermodynamics, the generation of entropy shows that irreversible processes occur in the vortex tube.
최훈기,유근종,임윤승 한국기계가공학회 2018 한국기계가공학회지 Vol.17 No.2
A vortex tube is a simple energy separating device that splits a compressed air stream into a cold andhot stream without any external energy supply or chemical reactions. The efforts of many researchers anddesigners have been focused on improvement of vortex tube efficiency by changing the parameters affectingvortex tube operation. The effective parameters are nozzle specifications and inflow pressure conditions. Effects of different nozzle cross-sectional area and number of nozzles are evaluated by computational fluiddynamics (CFD) analysis. In this study, CFD analysis of 3-D steady state and turbulent flow through avortex tube was performed . We investigated the cold air mass flow rate, the cold air temperature, and thecold air heat transfer rate behavior of a vortex tube by utilizing seven straight nozzles and four inflowpressure conditions.
압축 공기 냉각을 이용한 자기 변형 구동기의 열해석에 관한 연구
곽용길(Yong Kil Kwak),MD. G. Mostofa,황진동(Jin Dong Hwang),김선호(Sun Ho Kim),안중환(Jung Hwan Ahn) 한국생산제조학회 2009 한국생산제조학회지 Vol.18 No.4
Precision positioning system with magnetostrictive actuator(MA) has widely used in manufacturing devices to control the positioning accuracy to meet the high load and stroke requirements. It has many advantage in comparison with piezoelectric actuator; high force, high strain, high efficient etc. But, the performance of Terfenol-D, the commercially available magnetostrictive material, is highly dependent on the prestress, magnetic field intensity and temperature. Therefore, thermal strain of magnetostrictive material obstructs precision position control of magnetostrictive actuator, magnetostrictive actuator is need of cooling system. In this paper, cooling system using compressed cold air is developed and proper temperature and velocity of compressed cold air is studied by thermal analysis according to applied current.
압축 공기 냉각을 이용한 자기 변형 액추에이터의 위치 추종 성능 향상
곽용길(Yong Kil Kwak),황진동(Jin Dong Hwang),김철민(Churl Min Kim),김선호(Sun Ho Kim),안중환(Jung Hwan Ahn) 한국생산제조학회 2007 한국생산제조학회지 Vol.16 No.4
Precision positioning system with magnetostrictive actuator(MA) has widely used in manufacturing devices to control the positioning accuracy to meet the high load and stroke requirements. It has many advantage in comparison with piezoelectric actuator; high force, high strain, high efficient etc. But, the performance of Terfenol-D, the commercially available magnetostrictive material, is highly dependent on the prestress, magnetic field intensity and temperature. This paper present an experimental investigation of the temperature effect on displacement characteristics of magnetostrictive actuator. In this paper, compressed cold air is proposed to improve of positioning accuracy of magnetostrictive actuator. The compressed cold air cooling system has good cooling effect Experimental results confirming the effectiveness of the proposed cooling system as high precision positioning system are also has presented in this paper.