Prediction of the surface tension of refrigerants and their binary mixtures

The use of scaling principles for the prediction of surface tension was stu died. The temperature dependences of the capillary constant, density differ ence on the saturation line, and surface tension were investigated. New rel ations containing only a few constants were proposed, which made it possibl e to calculate the capillary constant and surface tension. On the basis of theoretical and experimental studies, equations have been determined for th e calculation of the surface tension of poorly studied refrigerants over wi de regions of the state parameters. Relations are also proposed that may be used for calculating the surface tension of binary mixtures at specified c ompositions of the liquid phase. An equation of the surface tension For red uced isotherms was proposed. Results elf investigations of the surface tens ion of binary mixtures, R116/23, R22/14, R134a/152a, and R22/142b, are pres ented.