Layering instability in a confined suspension flow

Abstract

We have shown [J.\ Fluid Mech.\ {\bf 592}, 447 (2007)] that swapping (reversing) trajectories in confined suspension flows prevent collisions between particles approaching each other in adjacent streamlines. Here we demonstrate that by inducing layering this hydrodynamic mechanism changes the microstructure of suspensions in a confined Couette flow. Layers occur either in the near-wall regions or span the whole channel width, depending on the strength of the swapping-trajectory effect. While our theory focuses on dilute suspensions, we postulate that this new hydrodynamic mechanism controls formation of a layered microstructure in such flows in a wide range of densities.

5 pages, 6 figures

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• How Confinement-Induced Structures Alter the Contribution of Hydrodynamic and Short-Ranged Repulsion Forces to the Viscosity of Colloidal Suspensions
• Flow-induced segregation and dynamics of red blood cells in sickle cell disease
• Structure and dynamics of a layer of sedimented Brownian particles
• A Mean Field Model of Layering Instability in Shearing Suspensions