Berlin 2018 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 27: Microfluidics

DY 27.6: Talk

Tuesday, March 13, 2018, 12:30–12:45, BH-N 128

Passive swimming of soft particles in oscillatory Poiseuille flow — •Winfried Schmidt¹, Matthias Laumann¹, Eva Kanso², and Walter Zimmermann¹ — ¹Theoretische Physik 1, Universität Bayreuth, 95440 Bayreuth, Germany — ²Aerospace and Mechanical Engineering, University of Southern California, Los Angeles, California, USA

What is the dynamical behavior of soft particles in oscillatory (pulsating) Poiseuille flow at low Reynolds number? By investigating the overdamped motion of bead-spring models for a triangle, 2D ring polymers or 3D capsules, we predict particle actuation in the case of vanishing mean flow. This effect is generic as it does not depend on the model. Asymmetric, Janus like particles propagate in a symmetric flow. Symmetric particles swim for non-symmetric flow oscillations (non equal half periods). The mean actuation (swim) velocity of a particle is caused by its varying shape in both half periods. Since the actuation steps depend also on the size and the elasticity of soft particles, this novel actuation (passive swimming) mechanism is also appropriate for particle sorting.