Research Status on the Physical Properties of Working fluid-Lubricant Mixture Systems{fr}État de la recherche sur les propriétés physiques des systèmes de mélange fluide de travail-lubrifiant.

• The physical properties of work fluid-lubricant mixture systems were reviewed. • An overview of the classification and characteristics of existing lubricants was presented. • The experimental methods of the physical properties were summarized. • The efficiency and safety improvement studies were compared and summarized. As countries prioritize climate change concerns, promoting the use of new environmentally friendly working fluids has become a common goal for the industry. In thermal systems, lubricants come into contact with these working fluids and directly affect their utilization efficiency. Therefore, investigating the effect of lubricant mixing on the physical properties of process media is essential to promote the adoption of new environmentally friendly working fluids. This paper categorizes and organizes recent research literature on working fluids and lubricants. It was aimed to comprehend the effect of lubricants on the operating characteristics of working fluids. By comparing the research methods and experimental equipment utilized in previous studies, this work analyzes the variation of basic physical properties, including miscibility, solubility, viscosity, and gas-liquid phase equilibrium. In addition, the effects of lubricant mixing in terms of heat exchange characteristics, additives, and material compatibility are also summarized. These findings provide a reference for achieving optimal performance matching of new environmentally friendly working fluid-lubricant combinations. And it will be beneficial for future experimental studies investigating the physical properties associated with working fluid-lubricant mixing systems. [ABSTRACT FROM AUTHOR]