GLOBAL CORRESPONDING STATES REPRESENTATION OF THE INTERFACIAL-TENSION AND CAPILLARY CONSTANT FOR THE BINARY-MIXTURES ARGON PLUS KRYPTON, METHANE PLUS KRYPTON, AND KRYPTON PLUS ETHANE

Corresponding states theories for surface tension and capillary constant have been evaluated using constant liquid mole fraction and constant ''fugacity fraction'' reference fluids for three binary systems. Experimental vapor-liquid equilibria, capillary constant, and surface tension data for argon + krypton, methane + krypton, and krypton + ethane systems were measured from 125 K to the critical line. These results form a database for phase behavior of varying complexity between simple compounds. The database has been used to compare the ''fugacity fraction'' corresponding states theory for capillary constant and surface tension with the traditional corresponding states theory which uses as a reference fluid a liquid with constant mole fraction. The database was also used to test the Moldover and Rainwater prediction for the surface tension coefficient in the fugacity fraction corresponding states theory.