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DY: Fachverband Dynamik und Statistische Physik

DY 33: Poster II

DY 33.18: Poster

Donnerstag, 14. März 2013, 17:00–19:00, Poster C

Bifurcation to cross-stream migration in Poiseuille flow — •Matthias Laumann, Steffen Schreiber, Johannes Greber, and Walter Zimmermann — Universität Bayreuth, Theoretische Physik, 95440 Bayreuth, Germany

The dynamics of asymmetric dumbbells and semiflexible polymers in Poiseuille flow is investigated. We find that asymmetric dumbbells and semiflexible polymers may migrate towards or away from the center of a Poiseuille flow, depending on the asymmetry of a dumbbell or on the bending stiffness of a semiflexible polymer as well as on the flow parameters. In the case they migrate away from the center of a Poiseuille flow, there are parameter ranges, where they migrate even in the absence of the effects of bounding walls only up to some distance away from the flow center. The distance of the final position of a dumbbell (semiflexible polymer) depends on the flow parameters as well as on the asymmetry and elasticity of the dumbbell (bending stiffness of a semiflexible polymer).