This paper is the second step in the study of deviations from equilibrium in models of decaying SF 6 arcs. The first step was based on a kinetic approach, which allowed us to study the influence of deviations from chemical equilibrium. Departures from equilibrium are shown for a simplified geometry, and we find results similar to those of in the literature for the influence of pressure or intensity. In order to build the basis of the two-temperature model, we calculated the two-temperature composition, the transport coefficients and thermodynamic properties, and the energy exchange term between electrons and heavy particles through elastic collisions. Electron-ion collisions contribute to the main part of the energy exchange term, S + and S 2 + having the greatest contributions to this term. Our results show that taking departures from thermal equilibrium into account leads to a slower cooling rate of the plasma. The evolution of temperature departures during extinction is in agreement with experimental results.
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Girard et al. (1999) studied this question.
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