Abstract
Gas viscosity of non-azeotropic mixtures of R12 and R22 was measured by an oscillating disk viscometer of the Maxwell type at 298.15~398.15K and pressures up to 6 MPa with an error of 0.2%. An empirical equation was obtained for the viscosity as a function of composition, temperature and density. This equation reproduced the observed viscosity with a maximum deviation of 2%. Normal pressure viscosity was found to be predicted with a maximum deviation of 2.5% by the Sutherland-Thiesen equation, the coefficients of which were approximated by Brokaw's method.
