Regensburg 2019 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 38: Microswimmers (joint session DY/CPP)

DY 38.9: Talk

Wednesday, April 3, 2019, 17:45–18:00, H19

Actuation of particles in modulated Poiseuille flow — •Winfried Schmidt^{1, 2}, Matthias Laumann¹, Eva Kanso², and Walter Zimmermann¹ — ¹Physikalisches Institut, Universität Bayreuth, 95440 Bayreuth, Germany — ²Aerospace and Mechanical Engineering, University of Southern California, Los Angeles, USA

What is the dynamical behavior of micro-particles in Poiseuille flow with oscillating flow direction at low Reynolds number? We investigate the overdamped motion of bead-spring models, e.g., capsules and red blood cells. We predict net motion of the particles, despite vanishing mean flow. This effect is generic as it does not depend on the model and is explained by a broken symmetry. The mean actuation velocity of passive particles is caused by their varying shape in both half periods. Since the net velocity depends also on the size and the elasticity of the particles, this novel actuation mechanism is appropriate for particle sorting. The system is also explored for active particles.