Driven low density granular mixtures

Details Driven low density granular mixtures Driven low density granular mixtures

2002-05-29

arxiv.org/abs/cond-mat/0205619v1

Phys. Rev. E 66, 051304 (2002)

Physics

Condensed Matter

Statistical Mechanics

19 pages, 12 figures, submitted for publication

Scientific paper

10.1103/PhysRevE.66.051304

We study the steady state properties of a 2D granular mixture in the presence of energy driving by employing simple analytical estimates and Direct Simulation Monte Carlo. We adopt two different driving mechanisms: a) a homogeneous heat bath with friction and b) a vibrating boundary (thermal or harmonic) in the presence of gravity. The main findings are: the appearance of two different granular temperatures, one for each species; the existence of overpopulated tails in the velocity distribution functions and of non trivial spatial correlations indicating the spontaneous formation of cluster aggregates. In the case of a fluid subject to gravity and to a vibrating boundary, both densities and temperatures display non uniform profiles along the direction normal to the wall, in particular the temperature profiles are different for the two species while the temperature ratio is almost constant with the height. Finally, we obtained the velocity distributions at different heights and verified the non gaussianity of the resulting distributions.

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