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DY: Dynamik und Statistische Physik

DY 46: Poster

DY 46.94: Poster

Donnerstag, 30. März 2006, 16:00–18:00, P1

Particle accumulation in laminar flow — •Michael Schindler, Marcin Kostur, Peter Talkner, and Peter Hänggi — Institut für Physik, Universität Augsburg

For most applications of microfluidic flows the transport properties of immersed particles are of decisive relevance. Small particles moving in flow fields with small velocity gradients can be described as point-like. They undergo an advective motion superimposed by Brownian motion, which finally leads to a uniform particle distribution. Non-uniformity may only result from the finite extension of the particles.

We will discuss two effects leading to particle accumulation. In the first case the boundary leads to a non-uniform distribution of small spherical particles. The second mechanism is based on the coupling of translational and rotational motion for asymmetric objects and may lead to a spatial separation of chiral particles in conveniently chosen flow fields.

[1] Z. Guttenberg et al., Flow profiling of a surface acoustic wave nanopump, Phys. Rev. E 70, 056311 (2004)

[2] M. Kostur, M. Schindler, P. Talkner and P. Hänggi, Chiral separation in microflows, (submitted)