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DY: Fachverband Dynamik und Statistische Physik

DY 41: Poster - Pattern/ Nonlinear Dyn./ Fluids/ Granular/ Critical Phen.

DY 41.17: Poster

Donnerstag, 3. April 2014, 17:00–19:00, P3

Importance of asymmetry for cross-streamline migration of bead spring models in oscillating shear flows — •Matthias Laumann, Diego Kienle, and Walter Zimmermann — Theoretische Physik, Universität Bayreuth, 95440 Bayreuth, Germany

We investigate cross-streamline migration of bead-spring polymers in time-dependent linear shear flows in the limit of small Reynolds numbers. Dumbbells and ring polymers are used as base models and it is shown that cross-streamline migration in time-dependent linear shear flow exists only if the deformable dumbbell or the ring polymer have an intrinsic asymmetry. Once the asymmetry being in place, the migration efficiency can be controlled by adjusting the amplitude and the period of the oscillating shear gradient. Our findings suggest that small deformable objects of different asymmetry and elasticity may be separated by switched shear flows via the process of cross-streamline migration.