Directed motion and useful work from an isotropic nonequilibrium distribution

Details Directed motion and useful work from an isotropic nonequilibrium distribution Directed motion and useful work from an isotropic nonequilibrium distribution

2007-11-26

arxiv.org/abs/0711.4105v1

Phys. Rev. E 77, 011115 (2008)

Physics

Condensed Matter

Statistical Mechanics

Scientific paper

10.1103/PhysRevE.77.011115

We demonstrate that a gas of classical particles trapped in an external asymmetric potential undergoes a quasiperiodic motion, if the temperature of its initial velocity distribution $T_{ne}$ differs from the equilibrium temperature, $T_{eq}$. The magnitude of the effect is determined by the value of $T_{ne}-T_{eq}$, and the direction of the motion is determined by the sign of this expression. The "loading'' and "unloading'' of the gas particles change directions of their motion, thereby creating a possibility of shuttle-like motion. The system works as a Carnot engine where the heat flow between kinetic and potential parts of the nonequilibrium distribution produces the useful work.

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