Energy partition and segregation for an intruder in a vibrated granular system under gravity

Details Energy partition and segregation for an intruder in a vibrated granular system under gravity Energy partition and segregation for an intruder in a vibrated granular system under gravity

2005-07-08

arxiv.org/abs/cond-mat/0507206v1

Physics

Condensed Matter

Statistical Mechanics

To appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.95.098001

The difference of temperatures between an impurity and the surrounding gas in an open vibrated granular system is studied. It is shown that, in spite of the high inhomogeneity of the state, the temperature ratio remains constant in the bulk of the system. The lack of energy equipartition is associated to the change of sign of the pressure diffusion coefficient for the impurity at certain values of the parameters of the system, leading to a segregation criterium. The theoretical predictions are consistent with previous experimental results, and also in agreement with molecular dynamics simulation results reported in this paper.

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