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Progress in Plasma Processing of Materials, 2001

ISBN Print: 1-56700-165-3

The influence of the non-local thermal equilibrium parameters on the isentropic exponent in plasmas

Abstract

It will be shown that for non-equilibrium atmospheric monoatomic plasmas the isentropic exponent is 1.2 for a large range of ionization degrees. Deviations from temperature and ionization-recombination equilibrium which depend asymptotically on the electron density are included.
The stiffness of the results, i.e. the small freedom to deviate from equilibrium, expresses the fact that the plasma tends to remain close to its temperature and ionization-recombination equilibrium.
The obtained result enables the use of an (quasi-)adiabatic energy balance to ease the full hydrodynamic modelling of plasmas.
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