J. Phys. IV France
Volume 10, Numéro PR7, May 2000
International Workshop on Dynamics in Confinement
Page(s) Pr7-41 - Pr7-45
International Workshop on Dynamics in Confinement

J. Phys. IV France 10 (2000) Pr7-41-Pr7-45

DOI: 10.1051/jp4:2000708

Size dependence of self-diffusion in dense binary liquid of hard spheres

H. Kawai1, K. Froböse2, F. Kolbe2 and J. Jäckle2

1  Department of Physics, Kyushu University, Fukuoka, Japan
2  Department of Physics, University of Konstanz, Konstanz, Germany

For a very dense binary liquid of hard spheres the dependence of the velocity-autocorrelation function (VAF) of tagged particles and of the self-diffusion coefficient on system size is derived from the coupling of self diffusion to modes of collective flow. Collective flow is described by longitudinal and transverse current-current correlation functions for different wavevectors which are obtained by molecular dynamics simulation. The size dependence of the VAF is reproduced rather accurately for longer times t > 7τ, where τ is the mean time of free flight. The result for the size dependence of the self-diffusion coefficient is in satisfactory agreement with a direct calculation, but this result also depends on the VAF's at shorter times.

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