paper

Sand as Maxwell's demon

arXiv:cond-mat/9906275 · doi:10.1103/PhysRevLett.83.5322

Abstract

We consider a dilute gas of granular material inside a box, kept in a stationary state by shaking. A wall separates the box into two identical compartments, save for a small hole at some finite height . As the gas is cooled, a second order phase transition occurs, in which the particles preferentially occupy one side of the box. We develop a quantitative theory of this clustering phenomenon and find good agreement with numerical simulations.

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