Accurate determination of viscosity and surface tension of binary mixtures of R1234YF and R32 under saturated conditions by surface light scattering.

Surface tension and kinematic viscosity of binary mixtures of R1234yf and R32 are measured by surface light scattering (SLS) under saturated conditions between 293K and 343K. The R1234yf (1) + R32 (2) mixtures were prepared with mass fractions w1 of 0.362, 0.482, 0.670 and 0.923. For determination of the liquid kinematic viscosity, the expinties on a confidence level of more than 95 % (k = 2) are estimated to be ± 2 % for reduced temperatures Tr(= T/Tc) < 0.95, and ± 6 % for Tr close to 0.99. For the surface tension, the expanded uncertainties are less than ± 1.5% (k = 2) in the whole temperature range. The result can be applied to the utilization and exploitation of refrigerant.

本研究采用表面光散射（Surface Light Scattering，SLS）法，在293K至343K的饱和工况下，测定了R1234yf与R32二元混合物的表面张力与运动粘度。实验制备的R1234yf(1)+R32(2)二元混合物，其组分1的质量分数w1分别为0.362、0.482、0.670及0.923。在液态运动粘度的测定中，当对比温度Tr（定义为T/Tc）小于0.95时，置信水平高于95%（包含因子k=2）的扩展不确定度为±2%；当Tr接近0.99时，扩展不确定度为±6%。对于表面张力，全温度区间内的扩展不确定度均小于±1.5%（k=2）。本研究所得结果可应用于制冷剂的开发与利用。