Hydrodynamic and Brownian Fluctuations in Sedimenting Suspensions

Details Hydrodynamic and Brownian Fluctuations in Sedimenting Suspensions Hydrodynamic and Brownian Fluctuations in Sedimenting Suspensions

2004-09-06

arxiv.org/abs/cond-mat/0409133v2

Phys. Rev. Lett. 93, 220601 (2004)

Physics

Condensed Matter

Soft Condensed Matter

4 pages 4 figures, RevTex, to appear in Phys. Rev. Lett. New version with some minor corrections

Scientific paper

10.1103/PhysRevLett.93.220601

We use a mesoscopic computer simulation method to study the interplay between hydrodynamic and Brownian fluctuations during steady-state sedimentation of hard sphere particles for Peclet numbers (Pe) ranging from 0.1 to 15. Even when the hydrodynamic interactions are an order of magnitude weaker than Brownian forces, they still induce backflow effects that dominate the reduction of the average sedimentation velocity with increasing particle packing fraction. Velocity fluctuations, on the other hand, begin to show nonequilibrium hydrodynamic character for Pe > 1

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