The non-stationary process of liquid nitrogen outflow through a conical nozzle during depressurization of a high-pressure chamber is investigated. To describe the process, a two-phase spatial axisymmetric model of a vapor-liquid mixture in two-temperature, single-pressure, single-velocity approximations is adopted, taking into account nonequilibrium evaporation and condensation processes. The intensity of the phase transition depends on the number and radius of bubbles, the degree of superheat in temperature, heat of vaporization, thermal conductivity coefficient and Nusselt and Jacob numbers. The evolution of boiling of liquid nitrogen jet in the cryogenic temperatures region depending on various initial conditions is investigated. The influence of degree of superheat on the jet spray angle is analyzed. The verification of developed numerical method is evaluated by comparison with experimental data
