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arXiv · 1302.5924

Lift and down-gradient shear-induced diffusion in Red Blood Cell suspensions

Xavier Grandchamp·Gwennou Coupier·Aparna Srivastav·Christophe Minetti·Thomas Podgorski
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Abstract

The distribution of Red Blood Cells in a confined channel flow is inhomogeneous and shows a marked depletion near the walls due to a competition between migration away from the walls and shear-induced diffusion resulting from interactions between particles. We investigated the lift of RBCs in a shear flow near a wall and measured a significant lift velocity despite the tumbling motion of cells. We also provide values for the collective and anisotropic shear-induced diffusion of a cloud of RBCs, both in the direction of shear and in the direction of vorticity. A generic down-gradient subdiffusion characterized by an exponent 1/3 is highlighted.

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Xavier Grandchamp, Gwennou Coupier, Aparna Srivastav, Christophe Minetti, Thomas Podgorski. 2013-02-24. Lift and down-gradient shear-induced diffusion in Red Blood Cell suspensions. https://doi.org/10.1103/physrevlett.110.108101

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