Regensburg 2016 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 29: Poster - Active Matter, Microswimmers and -fluidics, Statistical Physics Biosystems

DY 29.12: Poster

Dienstag, 8. März 2016, 18:15–21:00, Poster C

Migration of soft particles in a modulated microchannel with flow along the grooves — •Winfried Schmidt, Matthias Laumann, and Walter Zimmermann — Theoretische Physik, Universitaet Bayreuth, Bayreuth, Germany

We find cross-streamline migration (CSM) of deformable particles in the low Reynold number limit in a plane Poiseuille flow with modulated boundaries and the flow along the grooves. CSM is studied for elastic 2D ring polymers, tetrahedrons and 3D capsules. We find two directions of cross-stream migration of particles. 3D particles migrate to the midplane between the two boundaries, similar as in the case of Poiseuille flow with plane boundaries [1]. In the case of modulated boundaries, the particles migrate in addition to the maxima and the minima of the distance between the two modulated boundaries. The migration velocity can be tuned by the amplitude of the boundary modulations. The migration velocity depends also on elasticity and size of the particles as well on the flow velocity. Our study suggests that the flow generated between wavy boundaries may be exploited for the separation of particles in modulated microfluidic channels.

[1] B. Kaoui, G. H. Ristow, I. Cantat, C. Misbah, W. Zimmermann, Phys. Rev. E 77 , 021903 (2008)