Inertial-microfluidic radial migration in solid/liquid two-phase flow through a microcapillary: Particle equilibrium position |
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| Authors: | Young Won Kim Hikui Noh Songwan Jin Jung Yul Yoo |
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| Affiliation: | (1) BK21 School for Creative Engineering Design of Next Generation Mechanical and Aerospace Systems, Seoul National University, Seoul, 151-744, Korea;(2) Division of Automobile Technology, Ajou Motor College, Boryeong-city, 355-769, Korea;(3) Department of Mechanical Engineering, Korea Polytechnic University, Siheung-si, 429-793, Korea;(4) School of Mechanical and Aerospace Engineering, Seoul National University, Seoul, 151-744, Korea;(5) Institute of Advanced Machinery and Design, Seoul National University, Seoul, 151-744, Korea; |
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| Abstract: | Although equilibrium of spherical particles under radial migration has been extensively investigated, mostly in macroscale flows with characteristic lengths on the order of centimeters, it is not fully characterized at relatively small Reynolds numbers, 1 ≤ Re ≤ 100. This paper experimentally studies “inertial microfluidic” radial migration of spherical particles in circular Poiseuille flow through a microcapillary. Microparticle tracking experiments are performed to obtain the spatial distribution of the particles by adopting a depth-resolved measurement technique. Through the analysis of the radial distribution of particles, inertial microfluidic circular Poiseuille flow is shown to induce a strong radial migration of particles at substantially small Re, which is quite in contrast to the pipe flows at large Re previously reported. This particle migration phenomenon is so prominent that particle equilibrium positions are formed even at small Re. However, it turns out that there exists a certain critical Re below which particle equilibrium position is almost fixed, but above which it seems to drift toward the channel wall. |
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