Modeling the boiling process of a liquid nitrogen jet outflow through a thin nozzle into a vacuum under cryogenic temperatures

The process of liquid nitrogen jet outflow from a high-pressure vessel through a thin nozzle into a vacuum chamber is numerically investigated using the two-phase model of a vapor-liquid mixture in two-temperature, two-velocity, one-pressure approximations, taking into account non-equilibrium processes of evaporation and condensation. The wide-range equation of state in analytical form is used to describe the thermodynamic properties of the liquid and gas phases. Rate of mass transfer during evaporation is assumed to depend on the number and radius of bubbles, heat of vaporization, and degree of superheating. Features of the velocity field, formed by the expanding jet flow for the degree of superheat by pressure of 60, are considered. The obtained calculated velocity distribution of the boiling jet flow is in satisfactory agreement with the experimental data.