Abstract

DOMINGUEZ, H.  and  ZENIT, R.. On the cooling law of a non-dilute granular gas. Rev. mex. fis. [online]. 2007, vol.53, n.2, pp.83-86. ISSN 0035-001X.

The cooling law of a granular gas was investigated using a three-dimensional MD simulation code, which allowed us to include both inelasticity and frictional effects of the particle contacts. It was found that the kinetic energy decays in time as E(t) t^-n; the exponent n of the cooling law changes significantly with the solid fraction, α, and the coefficient of restitution, e. For dilute gases, for times greater than t_c , we found that n 1, in agreement with the results reported by Nie et al. [10]. As α and/or increase, the cooling coefficient increases to an asymptotic value of n 2.2, which is slightly higher than the prediction made by Haff [3]. We interpret this increase in the cooling exponent as a possible re-homogenization of the granular state.

Keywords : Granular gas; cooling; Haff's law.

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