Liquid viscosity for binary mixtures of R22 + R1234ze(E) and R22 + R1234yf from (273 to 353) K at pressures up to 15 MPa

Abstract

Liquid viscosities for two binary systems of chlorodifluoromethane (R22) + Trans-1,3,3,3-Tetrafluoroprop-1-ene (R1234ze(E)) and chlorodifluoromethane (R22) + 2,3,3,3-tetrafluoroprop-1-ene (R1234yf) were measured with a vibrating-wire viscometer. Measurements were operated at 5 isotherms over the temperature range from (273 to 353) K and at pressures from slightly above saturation pressure up to 15 MPa. Four mole fractions of R22 were covered for each system, more specifically, x1 = (0.2269, 0.4376, 0.6379, and 0.8212) for R22 (1) + R1234ze(E) (2) and x1 = (0.2214, 0.4510, 0.6296, and 0.8163) for R22 (1) + R1234yf (2). The combined expanded uncertainty (k = 2) of the measured viscosity is about 2.0%. In addition, the extended hard-sphere (EHS) model was used to correlate the experimental viscosities for each individual composition, respectively. The average absolute relative deviations between the calculation and experiment for R22 + R1234ze(E) and R22 + R1234yf are within 0.3% and 0.4%, respectively. In addition, the EHS model combined with the mixing rules was applied to estimate the viscosity of these binary mixtures. The predicted results are in good agreement with the experimental data with relative deviations range from (−4.41 to 3.15) %.