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High-pressure carbon dioxide–organic solvent mixing layers: Global equilibrium models and the transition to single phase mixing

Abstract:

Transcritical injection is of relevance to many areas of science and engineering. In all applications, one of the most controversial issue is the pbkp_rediction of the transition point from two-phase to single phase mixing. In this work, we have analysed the applicability of recent transition models, e.g. the Knudsen criterion developed originally for propulsion applications, to analyse the formation and development of mixing layers of carbon dioxide and different organic solvents. Results show that global equilibrium models fail to pbkp_redict the experimental behaviour reported in the literature and exhibit an inconsistent trend among the different organic solvents/CO2 mixtures. This implies that initial conditions alone are not sufficient to determine the evolution of the mixing layer. As a consequence, research efforts should be directed to the accurate description of the coupled energy and mass diffusive fluxes both at the liquid–gas interface and in the surrounding gaseous mixing layer.