P,T-DEPENDENCE OF SELF-DIFFUSION IN THE FLUID ONE-PHASE REGION OF THESYSTEM TETRADECANE METHANE/

High pressure self-diffusion coefficients and densities are reported f or the binary system tetradecane/methane in a wide range of temperatur e at Pressures up to 200 MPa. The experimental diffusion data of these mixtures are analyzed in the frame work of the rough hard sphere (RHS ) model under application of hard sphere (HS) molecular dynamics simul ations for binary mixtures of hard spheres obtained recently in our gr oup. The rotation-translation coupling parameter A shows a weak temper ature dependence, falling slightly when the temperature is lowered. Th e RHS-diamerer for the lighter compound is identical to the value foun d for neat methane. The value for the RHS-diameter of tetradecane in t he mixture is found slightly larger than in the neat retradecane. Both diameters show a slight increase with falling temperature.