Transport properties of highly asymmetric hard sphere mixtures

Details Transport properties of highly asymmetric hard sphere mixtures Transport properties of highly asymmetric hard sphere mixtures

2009-03-26

arxiv.org/abs/0903.4563v1

Physics

Condensed Matter

Soft Condensed Matter

27 pages, 7 figures

Scientific paper

The static and dynamic properties of binary mixtures of hard spheres with a diameter ratio of $\sigma_B/\sigma_A=0.1$ and a mass ratio of $m_B/m_A=0.001$ are investigated using event driven molecular dynamics. The contact value of the pair correlation functions are found to compare favourably with recently proposed theoretical expressions. The transport coefficients of the mixture, determined from simulation, are compared to the predictions of revised Enskog theory, using both a third-order Sonine expansion and direct simulation Monte Carlo. Overall, Enskog theory provides a fairly good description of the simulation data, with the exception of systems at the smallest mole fraction of larger spheres ($x_A=0.01$) examined. A "fines effect" was observed at higher packing fractions, where adding smaller spheres to a system of large spheres decreases the viscosity of the mixture; this effect is not captured by Enskog theory.

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