Gas-Droplet Turbulent Jets with Phase Transitions and Droplet Collisions

Abstract

The effect of phase transitions and droplet collisions on the parameters of a gas-droplet non-isothermal turbulent jet is studied numerically using the developed mathematical model of the jet. When carrying out the mathematical modeling of two-phase jet flow, the case of flow out of a heterogeneous medium from a nozzle into steady gas with the temperature significantly higher than the temperature of the phases at the nozzle exit is considered. The calculations carried out for various volume concentrations of droplets at the nozzle exit (in the initial jet cross-section) showed that at the concentration of the order of 10^–4, the droplet collisions do not have a significant effect on the jet parameters; this effect begins to manifest itself at an initial droplet concentration of the order of 5 × 10^–4 and becomes noticeable at the concentration equal to 10^–3. As distinct from droplet collisions, phase transitions have a noticeable effect on the jet parameters over the entire considered range of variation in the initial droplet concentration from 10^–4 to 10^–3.