MEASUREMENTS OF THE VISCOSITIES OF SATURATED AND COMPRESSED FLUID 1-CHLORO-1,2,2,2-TETRAFLUOROETHANE (R124) AND PENTAFLUOROETHANE (R125) AT TEMPERATURES BETWEEN 120-K AND 420-K

The shear viscosities of saturated and compressed fluid 1-chloro-1,2,2,2-tetrafluoroethane (R124) and pentafluoroethane (R125) have been measured with two torsional crystal viscometers at temperatures between 120 and 420 K and at pressures up to 50 MPa. At small molar volumes, the fluidity (reciprocal viscosity) increases linearly with molar volume at fixed temperature and weakly with temperature at fixed volume. We have described this behavior with simple empirical equations and have compared the data of Shankland and of Ripple with them. The data of Ripple are in good agreement with our data for both fluids.