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DY: Fachverband Dynamik und Statistische Physik

DY 14: Microfluidics and Droplets - organized by Uwe Thiele (Münster)

DY 14.2: Talk

Monday, March 22, 2021, 16:20–16:40, DYa

Actuation of soft particles in oscillating Poiseuille flow — •Winfried Schmidt¹, Sebastian W. Krauss², Andre Förtsch¹, Matthias Laumann¹, Matthias Weiss², and Walter Zimmermann¹ — ¹Theoretische Physik 1, Universität Bayreuth, 95440 Bayreuth, Germany — ²Experimentalphysik 1, Universität Bayreuth, 95440 Bayreuth, Germany

What is the dynamical behavior of soft particles in oscillatory (pulsating) Poiseuille flow at low Reynolds number? By investigating the overdamped motion of 2D bead-spring models, as well as 3D capsules and red blood cells, we predict particle actuation in the case of vanishing mean flow. This effect is generic as it does not depend on the model. We show that symmetric particles propagate for asymmetric flow oscillations with non-equal flow sections. The mean actuation (swim) velocity of a particle is caused by its varying shape in both parts of the flow period. Since the actuation steps depend also on the size and the rigidity of soft particles, this novel actuation (passive swimming) mechanism is also appropriate for particle sorting.