Dresden 2017 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 7: Soft Particles in Flows I (Focus session, joint DY/CPP)
DY 7.6: 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 Farutin1,2, Zaiyi Shen1,2, Thomas Fischer3, Jens Harting4,5, and Chaouqi Misbah1,2 — 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.