AN IMPROVED CORRELATION FOR THE VISCOSITY OF SIMPLE FLUIDS AT HIGH-DENSITIES

The Batschinski-Hildebrand relation is improved by plotting the fluidity versus the molar volume minus the hard-core volume of the molecules, the latter given by equation of state calculations. The relation can be cast in a corresponding states form by reducing the fluidity by the molar mass, the critical temperature, and the critical volume and by reducing the volume by the zero temperature hard-core volume. The random close-packed volume, where the fluidity is zero, is in reasonable agreement with theoretical considerations of hard spheres. The small deviations from corresponding states for liquids are interpreted either by polarity or by nonconvexity of the molecules. © 1990 Plenum Publishing Corporation.