โ Scribed by J.H. Dymond
No coin nor oath required. For personal study only.
Corrections to the Enskog theory for the viscosity and thermal conductivity of dense hard-sphere fluids are obtained by analysis, on the basis of the smooth hard-sphere model, of viscosity and thermal conductivity measurements for argon and krypton at temperatures above, as well as below, the critical temperature, together with viscosity and diffusion data for methane. The derived core sizes differ slightly, but significantly, from the values obtained from molar volumes at the freezing pressure. For the thermal conductivity, the corrections to Enskog are found to be significantly lower than those determined by computer simulation on finite systems. In general, the corrections obtained for viscosity and thermal conductivity depend on core size, but with the assumption that the core size for diffusion is identical to that for viscosity or thermal conductivity, specific corrections to the Enskog theory are derived, which give a satisfactory fit (generally to well within 5%) to all data above the critical density.
๐ SIMILAR VOLUMES
An equation is proposed to calculate the viscosity and thermal conductivity coefficients of methane from the dilute gas to the dense liquid. The range of validity of the equation is approximately 95-400 K for pressures up to 50 MPa (~500 atm). The reliabilities of the coefficients calculated are est
The self-diffusion coeffkient, shear viscosity and thermal conductivity of the Lennard-Jones fluid have been determined over essentially the whole phase diagram at densities below the solid-fluid coexistence line. This data is fitted to simple expressions developed from those proposed by Dymond.