Hydrodynamics of confined colloidal fluids in two dimensions

Details Hydrodynamics of confined colloidal fluids in two dimensions Hydrodynamics of confined colloidal fluids in two dimensions

2008-12-18

arxiv.org/abs/0812.3618v1

Physics

Condensed Matter

Soft Condensed Matter

RevTex 13 pages, 9 figures

Scientific paper

We apply a hybrid Molecular Dynamics and mesoscopic simulation technique to study the dynamics of two dimensional colloidal discs in confined geometries. We calculate the velocity autocorrelation functions, and observe the predicted $t^{-1}$ long time hydrodynamic tail that characterizes unconfined fluids, as well as more complex oscillating behavior and negative tails for strongly confined geometries. Because the $t^{-1}$ tail of the velocity autocorrelation function is cut off for longer times in finite systems, the related diffusion coefficient does not diverge, but instead depends logarithmically on the overall size of the system.

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