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A new way of implementing partial slip boundary conditions

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Abstract Book of the XXIII IUPAP International Conference on Statistical Physics, Genova, Italy, (9-13 July 2007)

Abstract

Partial slip boundary conditions determine the flow profile in the micrometer scale of modern separation devices where evidence is found that the famous macroscopic no slip boundary conditions are no longer applicable. We present a new approach to implement partial slip boundary conditions in Dissipative Particle Dynamics as well as in lattice-based algorithms. A viscous layer is introduced in the vicinity of the boundaries. Crucial parameter for the boundary conditions are the slip length and the position of the hydrodynamic boundaries. The presented method allows to tune the slip length from no slip to full slip systematically and an analytic equation for the slip length and the hydrodynamic boundary positions as a function of the model parameters can be derived. Comparison with simulations show that this expression is valid over a wide range of parameters.

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