Some thoughts about nonequilibrium temperature

Details Some thoughts about nonequilibrium temperature Some thoughts about nonequilibrium temperature

1996-02-28

arxiv.org/abs/cond-mat/9602149v1

Physics

Condensed Matter

13 pages, TeX, no figures, to appear in Mol. Phys

Scientific paper

10.1080/00268979650026415

The main objective of this paper is to show that, within the present framework of the kinetic theoretical approach to irreversible thermodynamics, there is no evidence that provides a basis to modify the ordinary Fourier equation relating the heat flux in a non-equilibrium steady state to the gradient of the local equilibrium temperature. This fact is supported, among other arguments, through the kinetic foundations of generalized hydrodynamics. Some attempts have been recently proposed asserting that, in the presence of non-linearities of the state variables, such a temperature should be replaced by the non-equilibrium temperature as defined in Extended Irreversible Thermodynamics. In the approximations used for such a temperature there is so far no evidence that sustains this proposal.

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