Abstract
A simple Brownian model for the collective dynamics of a fluid confined by rigid walls is described for which the collective velocity autocorrelation function (CVACF) decays exponentially. Using this approach, a new method of calculating the Maxwell velocity slip coefficients from the collective diffusion coefficient, obtained from equilibrium molecular dynamics, is proposed. A comparison of the slip coefficients for a range of fluid densities with the results obtained from the tangential velocity loss of the colliding particles in non-equilibrium simulations show excellent agreement.
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