general equation of state for dense fluids

INTERNATIONAL JOURNAL OF THERMOPHYSICS

V.18, No.5

(1997)

P.1197-1217

Compressed fluid,Equation of state,Regularities

A general equation of state, originally proposed for compressed solids by Parsafer and Mason, has been sucessfully applied to dense fluids. The equation was tested with experimental data for 13 fluid, including potar, nonpolar,saturted and unsaturated hydrocarbons, strongly hydrogen bonded,and quantum fluids. This equation works well for densities larger than the Boyle density Pn [1 ***/px = T***n dB***2(T***n)dT, where B**2(Tn) is the second virial coefficient at the Boyle temperature,at which B**2 =0] and for a wide temperature range ,specifically from the point to the highest temperature for which the exerimental measurements have been reported. The equation is used to prediet some important known tegularities for dense fluids, like the common bulk modulus and the common compression points, and the Tait Murnaghan cquation Regarding teh common points, the equation of state predicts that such common points are only a low-temperature chracteristic of dense fluids, as verified expermentally.It is also found that the temperature dependence of the parametrs of the equation of state differs from those given for the compressed slieds. Specifically thay are given by A,(T)=a***i +b***iT**2 -d***T ln(T).

1376/09

Shahsvary

GN105453