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민정기(J. Min),윤호영(H. Yun),이승훈(S.H. Lee),정승환(S.H. Jung),박태규(T.G. Park),한동철(D-.C. Han) 한국생산제조학회 2008 한국생산제조시스템학회 학술발표대회 논문집 Vol.2008 No.5
Hydrodynamic focusing or sheathflow focusing has been used to confine the sample within a certain volume of a fluid stream. Using that focusing method, flowcytometers equipped with microchips should have microchannels which are horizontal to the ground. Accordingly, the sedimentation phenomena of cells which lead to the erroneous counting of cells or the problem of clogging with cells around the channel entrance are inevitable. Three-dimensional (3D) hydrodynamic focusing can solve those problems with ease. This paper presents a simple microchannel design for an effective 3D focusing of the sample in microchip type flowcytometers and experimental results of CD4+ T-cells counting using our proposed microchip for HIV screening.
디퓨저 깃배치각의 변화에 따른 원심압축기의 공력성능 특성에 관한 수치 연구
박태규(T.G. Park),정인수(I.S. Jung),정희택(H.T. Chung),박준영(J.Y. Park),김세미(S.M. Kim),백제현(J.H. Baek) 한국전산유체공학회 2010 한국전산유체공학회 학술대회논문집 Vol.2010 No.5
In the present study, the effects of the stagger angles on the aerodynamic performances in the vaned centrifugal compressor has been investigated by CFD methods. The diffuser vane angles were varied in the range of ±10 deg. from the initial-design points. The commercial Navier-Stokes solver, ANSYS-CFX were applied to solve the impeller-diffuser flowfields. Through the numerical results, the desirable setting angles were proposed to fit the best performance to the variation of the operating conditions.
박태규(T. G. Park),정인수(I. S. Jung),정희택(H. T. Cluing),정효민(H. M. Jeong) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.11
In the present study, the numerical simulation has been performed to investigate the performance of the gas-liquid ejector. The aim of this research is to analyze the influence of variable motive pressure and the suction chamber size on the performance of ejector. The commercial CFD software, ANSYS CFX with the proper modeling was applied for analyzing the internal flow. This simulation was conducted in the variation of motive pressure and suction chamber size. The air and water were selected as the operation gas and liquid. In the results, the mass flow rate of air and water increase when the motive pressure increases. The gas-liquid mass flow rates ratio almost constant regardless of the increase of the motive pressure. The more water was inhaled by increasing the suction chamber size. The results is showing that the mass flow rates of air and water are influenced by the motive pressure and the suction chamber size.
박태규(T.G. Park),정희택(H.T. Chung),박준영(J.Y. Park),성병일(B.I. Sung) 한국전산유체공학회 2011 한국전산유체공학회지 Vol.16 No.3
The turbo blowers having large power capacity are generally composed of the variable inlet guide vane, the impeller and the variable diffuser. In the present study, the effect of the stagger angles on the aerodynamic performances has been investigated by CFD methods. The design specifications of the reference model having 400kW power were given as 7.43kg/s of mass flow rate, 1.66 of pressure ratio with 12000rpm of impeller rotating speed. As the first simulation parameter, the diffuser vane angle was varied in the range of ±20 degree from the initial-design point. The inlet guide vane angles, as the second one, was changed in the range of ±40 degree from the initial-design point. The commercial Navier-Stokes solver, ANSYS-CFX, was applied to solve the three-dimensional unsteady flow fields inside the turbo blower. Through the numerical results, the desirable selling angles were proposed to fit the best performance to the variation of the operating conditions.