【摘要】 合成润滑油广泛应用于各类制冷与热泵设备，其热物理性质是分析热力学能效、换热性能和沿程压降的基础数据，对评价和优化系统结构具有重要意义。本文研制了一套低温、高压悬滴法表面张力实验测量系统，并使用振动管密度计与悬滴法表面张力实验系统开展了基础润滑油（POE、PVE和PAG）的液相密度和表面张力实验研究，测量的温度范围为243.15～363.15 K，液相密度和表面张力测量的扩展不确定度分别在0.2%和0.1 m N·m^-1以内。实验结果表明：基础润滑油的液相密度和表面张力均随温度的增大而减小，关联方程的计算值与实验值的绝对平均偏差分别小于0.04%和0.5%。更多还原

【Abstract】 Synthetic lubricating oil is widely used in various types of refrigeration and heat pump equipment, and its thermophysical properties are the basic data for analyzing thermodynamic energy efficiency, heat transfer performance and pressure drop along the way, which is of great significance for evaluating and optimizing the system structure. In this paper, a set of low-temperature and high-pressure pendant drop surface tension experimental measurement system was developed, and the liquid phase density and surface tension of basic lubricating oils（POE, PVE and PAG） were studied by using vibrating tube density meter and pendant drop surface tension experimental system,and the measured temperature range was 243.15～363.15 K, and the extended uncertainty of liquid phase density and surface tension measurement was within 0.2% and 0.1 mN·m^-1, respectively. The experimental results show that the liquid phase density and surface tension of the base lubricating oil decrease with the increase of temperature, and the absolute average deviation between the calculated value and the experimental value of the correlation equation is less than 0.04% and 0.5%, respectively.更多还原