Technical Physics Letters
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Modeling the process of liquid nitrogen outflow through a conical nozzle into vacuum chamber
Bolotnova R. Kh.
1, Korobchinskaya V. A.
1,2, Gainullina E. F
1,2
1Mavlyutov Institute of Mechanics UFRC RAS, Ufa, Russia
2Ufa University of Science and Technology, Ufa, Russia
2Ufa University of Science and Technology, Ufa, Russia
Email: bolotnova@anrb.ru, buzina_lera@mail.ru, elina.gef@yandex.ru
The evolution of a liquid nitrogen jet boiling in the region of cryogenic temperatures at various initial degrees of superheat is investigated on the basis of a spatial axisymmetric two-phase model of a vapor-liquid mixture in two-temperature, single-pressure, single-velocity approximations, taking into account nonequilibrium evaporation and condensation processes. The reliability of a developed numerical method is estimated by comparison with the experimental data. The influence of the degree of superheat on the opening angle of the jet, the formation and development of vortex zones during the transition from the bubble flow mode to the vapor-droplet one with an assessment of the monodispersity level of the vapor-drop flow is analyzed. Keywords: liquid nitrogen, conical nozzle, boiling jet, cryogenic temperatures.
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