Inertial migration of neutrally buoyant particles in square channels at high Reynolds numbers

Yichang Wang (1) , Yanfeng Gao (1) , Pascale Magaud (1) , Lucien Baldas (1) , Christine Lafforgue (2) , Stéphane Colin (1)

1 ICA - Institut Clément Ader
2 LISBP - Laboratoire d'Ingénierie des Systèmes Biologiques et des Procédés

The inertial migration of particles in square channel flows at the micro-scale has been deeply investigated in the last two decades. The well-known four equilibrium positions are located near the center of each channel face at moderate Reynolds numbers [1]. More recently, Miura et al. [2] revealed experimentally the presence of eight equilibrium positions in millimetric square channels for Reynolds numbers higher than 250. The aim of the present work is to extend these results obtained at millimeter scale to the micrometer scale. To this end, in situ visualization of particles flowing in square micro-channels at Reynolds numbers ranging from 5 to 300 have been conducted and analyzed.

Mots clés: high Reynolds numbers; suspensions; inertial focusing; particle-laden flows

Domaines: Mécanique des fluides [physics.class-ph]

Yichang Wang, Yanfeng Gao, Pascale Magaud, Lucien Baldas, Christine Lafforgue, et al.. Inertial migration of neutrally buoyant particles in square channels at high Reynolds numbers. 5th European Conference on Microfluidics (μFlu18) and 3rd European Conference on Non-Equilibrium Gas Flows (NEGF18), Feb 2018, Strasbourg, France. pp.255-258. ⟨hal-02062598⟩