減圧に伴う液体窒素のフラッシング現象 : 第2報, 減圧初期におけるミスト層の形成および液面挙動

概要

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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.
一般社団法人日本機械学会の論文
1997-06-25