Work performed under the auspices of the U.S. Department of Energy under DOE Field Office, Idaho Contract DE-AC07-94ID13223.
Journal of Non-Equilibrium Thermodynamics
Thermal diffusity -- Mathematical models, Plasma (Ionized gases) -- Mathematical models, Thermodynamics
A simple approximation for thermal diffusion in gas mixtures was recently proposed . This approximation was based upon relations valid for rigid spheres. It is therefore appropriate for molecules with steep repulsive potentials, but not for ionized species interacting via the Coulomb potential. Here we formulate an analogous approximation for ionized species and free electrons. The resulting thermal diffusion coefficients differ in sign from those for hard molecules.
J.D. Ramshaw, "Simple Approximation for Thermal Diffusion in Ionized Gas Mixtures," J. Non-Equilib. Thermodyn. 21, 233 (1996).