Regensburg 2016 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 46: Poster: Wetting, Nano- and Microfluidics

DY 46.2: Poster

Wednesday, March 9, 2016, 18:15–21:00, Poster B2

Inertial migration of elastic capsules in Poiseuille flow — •Christian Schaaf, Kevin Irmer, Christopher Prohm, and Holger Stark — Institut für Theoretische Physik, Technische Universität Berlin, Berlin

Deformable particles such as capsules, vesicles, and red blood cells assemble at fixed equilibrium positions in a microfluidic channel. This behavior can be used to separate particles with different cell properties. For example, softer cells travel closer to the center than stiffer ones.

Using the lattice-Boltzmann method, we study the dynamics of single deformable particles in a microfluidic channel for intermediate Reynolds numbers.

We show that particles move to different equilibrium position depending on their size and deformability. For Reynolds numbers below 100, their equilibrium positions collapse onto a single master curve depending only on the Laplace number. The steady state of the particles is determined by the lift force profiles, which we determine for different channel aspect ratios.