SELECTED THERMOPHYSICAL PROPERTIES OF DENSE FLUIDS USING A GENERAL REGULARITY

A simple equation of state is used to calculate the bulk modulus, Joul e-Thomson inversion temperature, and isobaric expansivity of dense flu ids (with density greater than the Boyle density). The EOS predicts th e following regularities: (i) the linearity of the bulk modulus versus pressure for each isotherm of a dense fluid for a range of about 100 MPa for subcritical fluids and about 1000 MPa for supercritical fluids , (ii) the linearity of bulk modulus with respect to temperature for e ach isochore, and (iii) the linearity of inverse isobaric expansivity with pressure for each isochore. The regularities have been found to b e consistent with experimental observations. The calculated Joule-Thom son inversion temperature shows good agreement with experimental data in the range of validity of the EOS.