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PDMS 채널 내 전단유도에 의한 입자의 운동특성에 관한 연구
김영원(Y. W. Kim),유정열(J. Y. Yoo) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
An experimental study has been conducted to quantitatively characterize particle motion under shear-induced migration in square-PDMS microchannels by applying μ-PTV technique, and to compare with previous results carried out in macro-scale flow through a tube. It is shown that as the Reynolds number (Re) is increased, neutrally buoyant particles drift away from the wall and away from the center of the channel due to inertial migration. Particles are accumulated at the equilibrium position of 0.67H, with H being a half width of the channel, which is analogous to that of tube flow. Equilibrium position is nearly independent of Re and the maximum value of particle probability density function (PDF) is linearly increased as Re is increased. The outermost edge of particle cluster is in good agreement with previous results, and it is rapidly converged to about 0.7 at L₃ (reduced tube length proposed by Segre & Silberberg) = 1. Our study quantitatively presents an understanding of shear-induced particle migration in square microchannels and is associated with the study performed in macro scale. Furthermore, the present study gives optimum factors for designing of microfluidic systems.