On A Local Carnot Engine

Details On A Local Carnot Engine On A Local Carnot Engine

1999-03-25

arxiv.org/abs/cond-mat/9903376v1

Int. J. Mod. Phys. B 13 (1999) 375

Physics

Condensed Matter

Statistical Mechanics

9 pages, Revtex, to be published in Int. J. of Mod. Phys. B

Scientific paper

Starting from a master equation in a quantum Hamilton form we study analytically a nonequilibrium system which is coupled locally to two heat bathes at different temperatures. Based on a lattice gas description an evolution equation for the averaged density in the presence of a temperature gradient is derived. Firstly, the case is analysed where a particle is removed from a heat bath at a fixed temperature and is traced back to the bath at another temperature. The stationary solution and the relaxation time is discussed. Secondly, a collective hopping process between different heat bathes is studied leading to an evolution equation which offers a bilinear coupling between density and temperature gradient contrary to the conventional approach. Whereas in case of a linear decreasing static temperature field the relaxtion time offers a continuous spectrum it results a discrete spectrum for a quadratically decreasing temperature profile.

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