Flow generation by rotating colloids in planar microchannels
Theoretical Soft Matter and Biophysics, Institut für Festkörperforschung, Forschungszentrum Jülich 52425 Jülich, Germany, EU
Accepted: 13 December 2010
Non-equilibrium structure formation and conversion of spinning to translational motion of magnetic colloids driven by an external rotating magnetic field in microchannels is studied by particle-based mesoscale hydrodynamics simulations. For straight channels, laning is found. In ring channels, the channel curvature breaks symmetry and leads to a net fluid transport around the annulus with the same rotational direction as the colloidal spinning direction. The dependence of the translational velocity on channel width, ring radius, colloid concentration, and thermal motion is predicted.
PACS: 47.61.-k – Micro- and nano- scale flow phenomena / 83.10.Rs – Computer simulation of molecular and particle dynamics / 82.70.Dd – Colloids
© EPLA, 2010