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전자기 전항을 이용한 압전 구동방식 마이크로 펌프의 유동 및 성능 특성에 관한 수치해석적 연구
안용준(Yong Jun An),최청렬(Chung Ryul Choi),김창녕(Chang Nyung Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
A numerical analysis has been conducted for flow characteristics and performance of a micropump with piezodisk and MHD(Magnetohydrodynamics) fluid. Various micro systems which could not be considered in the past have been recently growing with the development of MEMS(Micro Electro Mechanical System) and micro machining technology. Especially, micropumps, essential part of micro fluidic devices, are being lively studied by many researchers. In the present study, the piezo electric micropump with electromagnetic resistance for electrically conducting fluids is considered. The prescribed grid deformation method is used for the displacement of the membrane. The change of the performance of the micropump and flow characteristics of the electrically conducting fluid with the magnitude of the magnetic fields, duct size, the position of the inlet and outlet duct are investigated in the present study.
장방형 흡입식 슬러지 수집기에서 수로의 최적설계 및 폐수 유동특성
용정권(Jung Kwon Yong),최청렬(Chung Ryul Choi),김창녕(Chang Nyung Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
Recently, the sludge suction collector is preferred rather than the scraper type sludge collector due to enhancement of the clarifier efficiency. The sludge suction collector is usually operated by the user's experience without any scientific and technical consideration. There are many factors that should be considered for higher quality of discharged water and stabilized flow in the rectangular sludge suction collector but, the optimal design on the inflow channel and orifices connecting with the inflow channel is needed for similar flow rates at the orifices. The 4 cases of channel geometry are considered and mass flow rates of each case at the orifices are evaluated using Computational Fluid Dynamics applied VOF(Volume of Fraction) model.
전자기 저항을 이용한 열공압형 마이크로 펌프의 유동특성 및 펌핑성능에 관한 수치해석적 연구
오세홍(Se Hong Oh),최청렬(Chung Ryul Choi),김창녕(Chang Nyung Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
A numerical analysis has been conducted for the flow characteristics and pumping performance of a thermo-pneumatic micropump with electrically conducting fluid. In the present study, considered is a thermo-pneumatic micropump for electrically conducting fluids with electromagnetic resistance alternately exerted at the inlet and outlet by alternately applied magnetic fields. A model of Prescribed Deformation is used for the motion of the membrane. Here, the pumping performance of the micropump and flow characteristics of the working fluid are investigated in the range of magnetic field intensity. The present numerical study shows that the net flow rate through the micropump is almost proportional to the strength of the applied magnetic field.