Dresden 2017 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 25: Posters - Soft Particles, Microswimmers, Microfluidics
DY 25.5: Poster
Dienstag, 21. März 2017, 18:15–21:00, P3
blood crystal: shear-induced ordering in confined suspensions of red blood cells — •zaiyi shen1, thomas m fischer2, alexander farutin1, jens harting3,4, and chaouqi misbah1 — 1Universite Grenoble Alpes/CNRS, Laboratoire Interdisciplinaire de Physique/UMR5588, Grenoble F-38041, France — 2Laboratory for Red Cell Rheology, 52134 Herzogenrath, Germany — 3Helmholtz Institute Erlangen-Nürnberg for Renewable Energy (IEK-11), Forschungszentrum Jülich, Fürther Strasse 248, 90429 Nürnberg, Germany — 4Department of Applied Physics, Eindhoven University of Technology, P.O. Box 513, 5600MB Eindhoven, The Netherlands
We report on numerical simulations and experiments which reveal that red blood cells (RBCs) submitted to a shear flow between two parallel walls spontaneously show order, in the Stokes regime, in the form of a 2D crystalline pattern of purely hydrodynamic origin. Order appears as a subtle interplay between (i) the wall-induced migration requiring RBCs deformability, and driving cells away from walls towards the mid-plane and (ii) the intercellular hydrodynamic interaction which has both attractive and repulsive contributions depending on RBC interdistance. Various crystal-like orders arise depending on RBC concentration and confinement. The equilibrium distance between RBCs is shown to be a linear and universal function of confinement. Hardened RBCs in experiments, and rigid particles in simulations adopt a disordered pattern, highlighting the intimate link between particle deformability and the emergence of order.