Berlin 2015 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 58: Poster - Fluids
DY 58.11: Poster
Thursday, March 19, 2015, 16:00–18:00, Poster A
Cross-streamline migration of soft and asymmetric particles in oscillatory shear flow — •Matthias Laumann1, Paul Bauknecht2, Andre Förtsch1, Stephan Gekle2, Diego Kienle1, and Walter Zimmermann1 — 1Theoretische Physik, Universität Bayreuth, 95440 Bayreuth, Germany — 2Biofluid Simulation, Physikalisches Institut, Universität Bayreuth, 95440 Bayreuth, Germany
We investigate the dynamics and cross-streamline migration (CSM) of asymmetric, soft particles in oscillatory, linear shear flow. Using 1D dumbbells, 2D ring polymers, and 3D capsules as elementary representatives of such particles, we show that these may indeed migrate within the shear plane only if they have an intrinsic material asymmetry and if the shear gradient varies with time. The CSM exists over a wide range of parameters and, importantly, is a generic property, i.e., it does neither depend on the dimensionality of the particle nor on the details how the particle asymmetry is realized. The migration velocity can be tuned by various parameters, including the frequency and amplitude of the time-dependent, linear shear flow as well as the elastic properties of the particle. Besides the fundamental importance of this phenomenon, the ability to tune the migration process externally has promising applications in microrheology such as particle separation.