Swimmer-tracer scattering at low Reynolds number

Details Swimmer-tracer scattering at low Reynolds number Swimmer-tracer scattering at low Reynolds number

2010-07-02

arxiv.org/abs/1007.0330v1

Soft Matter 6: 4268-4276, 2010

Physics

Condensed Matter

Soft Condensed Matter

14 pages, to appear in Soft Matter

Scientific paper

10.1039/c0sm00164c

Understanding the stochastic dynamics of tracer particles in active fluids is important for identifying the physical properties of flow generating objects such as colloids, bacteria or algae. Here, we study both analytically and numerically the scattering of a tracer particle in different types of time-dependent, hydrodynamic flow fields. Specifically, we compare the tracer motion induced by an externally driven colloid with the one generated by various self-motile, multi-sphere swimmers. Our results suggest that force-free swimmers generically induce loop-shaped tracer trajectories. The specific topological structure of these loops is determined by the hydrodynamic properties of the microswimmer. Quantitative estimates for typical experimental conditions imply that the loops survive on average even if Brownian motion effects are taken into account.

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