Homogeneous cooling of hard ellipsoids |
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Authors: | Fran?ois Villemot Julian Talbot |
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Affiliation: | 1. Laboratoire de Physique Th??orique de la Mati??re Condens??e, UPMC, CNRS UMR 7600, 4, place Jussieu, 75252, Paris Cedex 05, France
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Abstract: | We study the homogeneous cooling of hard, smooth ellipsoids in three dimensions using event driven numerical simulation. The elongation of the particle has a strong effect on the cooling behavior. Weakly elongated ellipsoids display two distinct cooling regimes. For small times, the translational and rotational energy decay at a different rates. Once their ratio reaches a time-independent value (different from equipartition), the overall temperature of the system decays like t ?2, as predicted by Haff??s law. For more elongated ellipsoids the translational and rotational temperatures rapidly reach a constant ratio near unity. The cooling behavior in the homogeneous state can be predicted from Haff??s law and the equilibrium collision rate. |
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