MODERATELY DENSE GAS QUANTUM KINETIC-THEORY - TRANSPORT COEFFICIENT EXPRESSIONS

Expressions for the transport coefficients of a moderately dense gas a re obtained, based on a recently derived density corrected quantum Bol tzmann equation. Linearization of the equations determining the pair c orrelation and the ''free'' singlet density operators about local equi librium is discussed first. The rate of change of the pair correlation s is treated as dynamic effects for pairs of particles relaxing to loc al equilibrium via a relaxation time model. arising from interactions with ''third particles.'' In contrast, the singlet density operator sa tisfies a Boltzmann equation with binary collisions. Spatially inhomog eneous corrections to the collision superoperator are included. Contri butions to the transport coefficients arise from the perturbation from local equilibrium through fluxes associated with kinetic, collisional and, for the thermal conductivity, potential energy mechanisms. A com parison is made between the classical limit of the transport coefficie nt expressions obtained here and the classical expressions previously derived from the Boltzmann equation with the nonlocal collision correc tions of Green and Bogoliubov. (C) 1995 American Institute of Physics.