Two-temperature thermodynamic and transport properties of carbon-oxygen plasmas

Thermodynamic and transport properties of different carbon-oxygen plasmas mixtures are presented for both thermal equilibrium and non-equilibrium conditions: to the knowledge of the authors, the latter data have not been reported in the literature. The calculations of transport properties are carried out using the Chapman-Enskog method up to the third order; properties for plasmas out of equilibrium have been obtained using both the two-temperature theory developed by Rat et al and a simplified theory by Devoto, that neglects the coupling between electrons and heavy particles; it is shown that for carbon-oxygen mixtures no differences between results obtained using these two theories can be appreciated for thermal and electrical conductivities; some discrepancies have been found for ordinary diffusion coefficients of the type electron-heavy particle. Moreover, local thermodynamic equilibrium results for transport properties obtained using Lennard-Jones potentials have been compared with results obtained using more recent potential data and with available results reported in the literature. Results for composition, mass density, specific heat, thermal conductivity, electrical conductivity and viscosity of atmospheric pressure plasmas in the electron temperature range 300-30 000 K are reported.