Regensburg 2019 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 61: Microfluidics (joint session DY/CPP)

DY 61.2: Vortrag

Freitag, 5. April 2019, 10:15–10:30, H6

Soft particles in inertial microchannel flow — •Christian Schaaf and Holger Stark — Institut für Theoretische Physik, Technische Universität Berlin, Berlin, Germany

Particles immersed in an inertial microchannel flow at intermediate Reynolds numbers move towards discrete equilibrium positions in the channel cross section. This Segré-Silberberg effect can be explained by the inhomogeneous shear profile of Poiseuille flow and particle-wall interactions. While rigid particles assemble around halfway between channel walls and channel center, deformable capsules move closer towards the center [1]. In addition to this lateral inertial focusing, rigid particles at low densities also assemble on 1D lattices along the flow [2]. In this contribution we aim to understand how the deformability of elastic capsules influences the lattice formation and what novel structures now develop.

To study this problem we conduct lattice-Boltzmann simulations. As a first step we focus on the dynamics of a flowing particle pair and see how inertia changes the dynamics of a pair of deformable capsules. For a pair of rigid particles we have recently found that the dynamics is dominated by viscous forces at small distances and by inertial forces at larger distances [3].

In the end these results are used to explain the behavior of soft particle trains and to analyze their dynamics and stability.