Viscosity and thermal conductivity of cesium vapor at high temperatures

Abstract

This paper presents the prediction of equilibrium thermodynamic properties of liquid cesium metal and transport properties of cesium metal vapor by applying an identical potential function obtained from liquid cohesive energy density data including data for the supercooled state at proximity of absolute zero. Prediction of equilibrium thermodynamic properties is made possible by derivation of isotherms, which is accurately linear in the whole liquid range including metal–nonmetal transition. For transport properties, the collision integrals are tabulated, and values of viscosity plus thermal conductivity of cesium vapor are obtained from Chapman–Enskog solutions of Boltzman equation. The viscosity values are in agreement with experiment within ±4% with average deviation 2%, and are in agreement with theory within ±4.70% with average deviation 3.26%. The thermal conductivity values are in agreement with experiment within 11% with average deviation 8%, and are in agreement with theory within 4.2% with average deviation 2.8% over the temperature range considered. It is likely that the potential function can be used to predict both equilibrium and transport properties with reasonably good accuracies.