Some Remarks About Extremum Principles Involving the Rate of Entropy Production

Physics – Classical Physics

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Scientific paper

The minimum rate of entropy production (MREP) and the least dissipation energy (LDE) principles are re-examined concerning continuous systems in stationary nonequilibrium states. By means of simple considerations on coefficients of phenomenological laws and by taking into account balance equations, an Onsager-like potential density for the stationary state is obtained. In the case of a single state variable it is found that the potential density describes a saddle-shaped surface around the stationary point in the domain of the force (state variable) and the flux. The saddle point may be considered a maximum along a LDE path (fixed force) and a minimum along a MREP path (fixed phenomenological coefficient). The latter allow for the Glansdorff-Prigogine local potential.

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