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>Flashing Phenomena of Depressurized Liquid Nitrogen in a Pressure Vessel (2nd Report, Mist formation and Behavior of Liquid Surface in early depressurization process)
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Flashing Phenomena of Depressurized Liquid Nitrogen in a Pressure Vessel (2nd Report, Mist formation and Behavior of Liquid Surface in early depressurization process)
Flashing of liquid nitrogen in a pressure vessel (cryostat) was observed at depressurization rates from 0.01 to 4.0 MPa/s. The explosive boiling behavior was observed by using a video camera. Pressure and temperature changes in the pressure vessel were measured. In the case of high depressurization rates, mist formation was observed in the vapor phase near the vapor-liquid surface at the early stage of the depressurization rocess. This mist layer becomes more dense as the depressurization rate increases. Observations of mist formation and the calculated temperature drop of the vapor under an adiabatic expansion process show that mist formation depends on the vapor expansion and boiling near the vapor-liquid surface. Mist formation in flashing phenomena play an important role in which the thermal nonequilibrium states between the supercooled vapor and the superheate liquid are relaxed due to depressurization.
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