Liquid Viscosity Measurements for the Binary and Ternary Refrigerant Mixtures of R134a, R1234ze(E), and R1234yf

ABSTRACT: The liquid viscosity measurements of three binary mixtures at nine compositions and one ternary mixture of R134a, R1234yf, and R1234ze(E) were conducted with a vibrating-wire viscometer in the temperature range of (273 to 353) K and at pressures of up to 15 MPa. The combined expanded uncertainty (k = 2) of the measurements was estimated to be 2.3%. Most of the relative deviations between the values from the REFPROP 10.0 and the experimental viscosities were within 2%. To predict the viscosity of the refrigerant mixtures, an extended hard-sphere (EHS) model combined with the mixing rules was developed. It is found that the viscosities for mixtures predicted by the model show good agreement with the experimental measurements, with the relative deviations being almost within 2%.