Cross-stream transport of asymmetric particles driven by oscillating   shear
  We study the dynamics of asymmetric, deformable particles in oscillatory, linear shear flow. By simulating the motion of a dumbbell, a ring polymer, and a capsule we show that cross-stream migration occurs for asymmetric elastic particles even in linear shear flow if the shear rate varies in time. The migration is generic as it does not depend on the particle dimension. Importantly, the migration velocity and migration direction are robust to variations of the initial particle orientation, making our proposed scheme suitable for sorting particles with asymmetric material properties. 
Matthias Laumann, Paul Bauknecht, Stephan Gekle, Diego Kienle, and   Walter Zimmermann
cond-mat.soft