Thermal conductivity and viscosity of moderately dense dipolar gases

Abstract

The initial pressure dependence of thermal conductivity and viscosity of polar gases is evaluated by considering the effect of triple collisions and collisional transfer in binary collisions. The effect of three-body collisions has been approximated by two-body collisions between a monomer and a dimer, the latter being defined to include stable and metastable pairs. The effect of collisional transfer is obtained from a modified Enskog theory as proposed by Stogryn and Hirschfelder. The analysis based on this simple model yields a substantial agreement with experiment. It is found that the numerical results are sensitive to the choice of the force constants for interaction of a monomer with a dimer.