Abstract
Transport equations for mass, momentum, energy, and heat flux based on the thirteen-momentum approximation of the Boltzmann equation are analyzed in the isobaric approximation. The left-hand-side terms are estimated and compared with terms representing the collisional transfer for the transient case of nonequilibrium two-temperature discharges in monoatomic gases. A simplified form of the equations is derived and the corresponding conditions are expressed as functions of the physical properties of the plasma. The system of equations is solved for a 0.5-A argon discharge at atmospheric pressure. The arbitrary initial distributions are allowed to relax to the equilibrium state, which is compared to previous results for a 0.4-A free-burning discharge in argon.
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