急減圧下での水平管内における沸騰現象に関する研究 : 第1報, 流動様式の観察と圧力の時間変化

概要

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Blowdown experiments with emphasis on an early response of depressurization were carried out on Freon-114 liquid in a horizontal tube. Visual investigations using a high-speed camera indicated that the initial flow pattern was bubbly around flashing inception points, but expansion and growth of the bubbles caused downstream liquid pushed out of the tube with a single phase. This pattern, like a slug flow, will give a higher discharge rate at an early stage of the blowdown than those calculated by current analytical models, since choking conditions will not be reached at the outlet. Measurements of local pressure and temperature showed a thermal non-equilibrium effect, which was indicated by a pressure holdup under the initial saturation pressure ; also, that the time lag of flashing inception after the passing of an initial expansion wave was less than 1ms, and the relaxation time from the non-equilibrium state was around 2 to 3 ms.
1986-03-25