REFERENCE CORRELATION OF THE VISCOSITY OF PROPANE

A new representation of the viscosity of propane includes a zero-densi ty correlation and an initial-density dependence correlation based on the kinetic theory of dilute gases and on the Rainwater-Friend theory. The higher density contributions of the residual viscosity in the rep resentation are formed by a combination of double polynomials in densi ty and reciprocal temperature, and a free-volume term with a temperatu re-dependent close-packed density. The full surface correlation is bas ed on a set of primary experimental data selected as a result of a cri tical assessment of the available information from 37 original viscosi ty studies. The review refers to 96 citations altogether. The validity of the representation extends from the triple point to 600 K and 100 MPa in accordance with the modified Benedict-Webb-Rubin equation of st ate. The uncertainty of the representation varies from +/-0.4% for the viscosity of the dilute gas phase between room temperature and 600 K, to about +/-2.5% for the range 100-475 K up to about 30 MPa, and to a bout +/-4% for points outside this range. Tables of the viscosity acco rding to the representative equations at selected temperatures and pre ssures and along the saturation line provide easy reference as well as the validation of computer codes. (C) 1998 American Institute of Phys ics and American Chemical Society. [S0047-2689(98)00405-X].