CORRELATION AND PREDICTION OF DENSE FLUID TRANSPORT-COEFFICIENTS .7. REFRIGERANTS

A recently developed scheme, based on considerations of hard-sphere th eory, is used for the simultaneous correlation of the coefficients of viscosity and thermal conductivity for the refrigerants R11, R12, R22, R32, R124, R125, R134a, R141b, and R152a in excellent agreement with experiment, over extended temperature and pressure ranges. Values for the roughness factors and correlations for the characteristic volume a re presented. The overall average absolute deviations of the experimen tal viscosity and thermal conductivity measurements from those calcula ted by the correlation are 2.1 and 2.3%, respectively, over a temperat ure range from 200 to about 10 K below the critical temperature and a pressure range from saturation to about 40 MPa. Since the proposed sch eme is based on recent and accurate density values, a Tait-type equati on was also employed to correlate successfully the density of the refr igerants. The overall average absolute deviation of the experimental d ensity measurements from those calculated by the correlation is +/-0.0 8%.