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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 6: Focus: Soft Particles in Flows I (joint focus session CPP/DY)

CPP 6.6: Vortrag

Montag, 20. März 2017, 12:15–12:30, ZEU 160

Hydrodynamic mechanism of shear-induced ordering in weakly confined suspensions of deformable particles — •Alexander Farutin^1,2, Zaiyi Shen^1,2, Thomas Fischer³, Jens Harting^4,5, and Chaouqi Misbah^1,2 — ¹Univ. Grenoble Alpes, LIPHY, F-38000 Grenoble, France — ²CNRS, LIPHY, F-38000 Grenoble, France — ³Laboratory for Red Cell Rheology, 52134 Herzogenrath, Germany — ⁴Helmholtz Institute Erlangen-Nürnberg for Renewable Energy (IEK-11), Forschungszentrum Jülich, Fürther Strasse 248, 90429, Nürnberg, Germany — ⁵Department of Applied Physics, Eindhoven University of Technology, P.O. Box 513, 5600MB Eindhoven, The Netherlands

It has been shown recently by experiments and numerical simulations that suspensions of red blood cells confined between two walls can undergo ordering when subject to shear flow. In this presentation, we propose a hydrodynamical model that explains this effect. The key ingredients of the model are (1) wall-induced migration, which keeps the cells close to the midplane between the two walls, (2) long-range hydrodynamic interactions in the direction parallel to the walls, which cause cell pairs to align with the flow direction and to get attracted to each other and (3) short-range hydrodynamic interactions perpendicular to the walls, which cause the cells move out of the midplane in such a way that the shear flow pushes them apart. We have verified by solving our model analytically that two cells form a stable stationary pair. The intercell distance given by our model agrees with the experiments and the simulations.