Energy production rates in fluid mixtures of inelastic rough hard spheres

Andrés Santos; Gilberto M. Kremer; Vicente Garzó

doi:10.1143/PTPS.184.31

paper

Energy production rates in fluid mixtures of inelastic rough hard spheres

arXiv:0910.5614 · doi:10.1143/PTPS.184.31

Abstract

The aim of this work is to explore the combined effect of polydispersity and roughness on the partial energy production rates and on the total cooling rate of a granular fluid mixture. We consider a mixture of inelastic rough hard spheres of different number densities, masses, diameters, moments of inertia, and mutual coefficients of normal and tangential restitution. Starting from the first equation of the BBGKY hierarchy, the collisional energy production rates associated with the translational and rotational temperatures ( $T_{i}^{tr}$ and $T_{i}^{rot}$ ) are expressed in terms of two-body average values. Next, those average values are estimated by assuming a velocity distribution function based on maximum-entropy arguments, allowing us to express the energy production rates and the total cooling rate in terms of the partial temperatures and the parameters of the mixture. Finally, the results are applied to the homogeneous cooling state of a binary mixture and the influence of inelasticity and roughness on the temperature ratios $T_{1}^{tr} / T_{1}^{rot}$ , $T_{2}^{tr} / T_{1}^{tr}$ , and $T_{2}^{rot} / T_{1}^{rot}$ is analyzed.

arXiv comment18 pages, 4 figures; published in a special issue of Prog. Theor. Phys. Suppl. devoted to the Proceedings of the long-term workshop "Frontiers in Nonequilibrium Physics. Fundamental Theory, Glassy & Granular Materials, and Computational Physics" and YKIS2009 (YITP, Kyoto, Japan, July 21-August 21, 2009). Open access of the paper in the link http://ptp.ipap.jp/link?PTPS/184/31/pdf

Energy production rates in fluid mixtures of inelastic rough hard spheres

Abstract

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