含油制冷剂R134a饱和液相运动黏度及表面张力实验测量

Kinematic Viscosity and Surface Tension of R134a Refrigerant-Oil Mixtures in Saturated Liquid Phase from 273.15 K to 293.15 K

以制冷剂R134a与润滑油的均匀混合物为研究对象，对其饱和液体的运动黏度、表面张力进行了实验测量，其中实验温度范围为273.15～293.15K，润滑油牌号为Solest120且其质量分数分别为20×10^-6、50×10^-6、80×10^-6、100×10^-6。实验数据显示，随着含油量的增加，合油R134a饱和液体的运动黏度、表面张力呈明显的递增趋势，且润滑油对R134a饱和液体运动黏度的影响随温度的升高逐渐减弱，对其表面张力的影响则随温度的升高逐渐增强。同时，依据实验数据，采用数学中常用的非线性回归法建立了含油R134a饱和液体的运动黏度、表面张力与温度、含油量之间的函数关系式，其中运动黏度关系式的相对偏差绝对平均值为2.22％，表面张力关系式的相对偏差绝对平均值为0.43％。

The kinematic viscosity and the surface tension of R134a and oil mixtures in saturated liquid phase from 273. 15 K to 293. 15 K are measured, the brand of the lubricant is Solestl20 and its mass fractions are 20×10^-6 , 50×10^-6 , 80×10^-6 and 100×10^-6 , respectively. These experimental results indicate that at the same temperature, with the increase in mass fraction Of lubricant, the kinematic viscosity and the surface tension of R134a refrigerant-oil mixtures in saturated liquid phase are enhanced significantly, the impact of lubrication on kinematic viscosity gradually decreases with the rising temperature and the impact of lubrication on surface tension gradually increases with the rising temperature. According to the experimental results, the principle of nonlinear regression is chosen to construct the relational expressions describing the relation between the kinematic viscosity, the surface tension and variation of temperature and mass fraction of lubricant, and their absolute averages of relative deviations reach to respectively 2. 22% and 0. 43% compared with the experimental results.