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This study demonstrates that the transport properties of alkali metals aredetermined principally by the repulsive wall of the pair interaction potentialfunction. The (hard-wall) Lennard-Jones(15-6) effective pair potential functionis used to calculate transport collision integrals. Accordingly, reducedcollision integrals of K, Rb, and Cs metal vapors are obtained fromChapman-Enskog solution of the Boltzman equation. The law of correspondingstates based on the experimental-transport reduced collision integral is usedto verify the validity of a LJ(15-6) hybrid potential in describing thetransport properties. LJ(8.5-4) potential function and a simple thermodynamicargument with the input PVT data of liquid metals provide the requiredmolecular potential parameters. Values of the predicted viscosity of monatomicalkali metals vapor are in agreement with typical experimental data with theaverage absolute deviation 2.97% for K in the range 700-1500 K, 1.69% for Rb,and 1.75% for Cs in the range 700-2000 K. In the same way, the values ofpredicted thermal conductivity are in agreement with experiment within 2.78%,3.25%, and 3.63% for K, Rb, and Cs, respectively. The LJ(15-6) hybrid potentialwith a hard-wall repulsion character conclusively predicts best transportproperties of the three alkali metals vapor.Comment: 21 pages, 5 figures, 41 reference

Hard-wall potential function for transport properties of alkali metal vapors