Ordering phenomena in cooling granular mixtures

Details Ordering phenomena in cooling granular mixtures Ordering phenomena in cooling granular mixtures

2004-03-08

arxiv.org/abs/cond-mat/0403203v1

Phys. Rev. Lett. 92, 174502 (2004)

Physics

Condensed Matter

Statistical Mechanics

4 pages, 5 figures, accepted for publication in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.92.174502

We report two phenomena, induced by dynamical correlations, that occur during the free cooling of a two-dimensional mixture of inelastic hard disks. First, we show that, due to the onset of velocity correlations, the ratio of the kinetic energies associated with the two species changes from the value corresponding to the homogeneous cooling state to a value approximately given by the mass ratio m_1/m_2 of the two species. Second, we report a novel segregation effect that occurs in the late stage of cooling, where interconnected domains appear. Spectral analysis of the composition field reveals the emergence of a growing characteristic length.

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