Analysis of the Role of Phase Transformations in the Reproduction of Gas–Liquid Flows is a Possibility to Improve the Standards of Discharge for Multiphase Flows

The influence of the phase transitions in gas–liquid flows on the accuracy of reproduction of the discharge of gas–liquid mixtures under high pressures on test benches is analyzed. An algorithm for the numerical analysis of the phase equilibrium of mixtures of air with various concentrations of an Exxol oil substitute is developed with the use of the equations of state and the fundamental concepts of thermodynamics. The coefficients of binary interaction of the Exxol oil substitute and the main components of air (nitrogen, carbon dioxide, oxygen, and argon) are obtained. The experimental data and numerical results on the saturation of Exxol–air mixtures are presented for various concentrations. It is shown that if we neglect the phase transitions, then the information about the parameters of multiphase flows measured on testing benches becomes significantly distorted.