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采用移动粒子半隐式(MPS)方法对静止过冷水中单个汽泡的凝结现象进行了数值模拟,研究了不同初始压力和初始直径时饱和蒸汽汽泡凝结过程,获得了凝结过程中汽泡形状、当量直径和压力的变化规律;汽泡初始压力为0.1～0.5MPa,初始直径为2mm、3mm和5mm;过冷水压力为0.1MPa,温度为70℃。结果表明两相界面不存在压差时,凝结过程中汽泡始终保持球形,汽泡当量直径逐渐减小,压力近似不变;相界面存在压差时,凝结过程中汽泡从球形逐渐变为心形、半月形,汽泡当量直径和压力会出现周期性振荡,且初始压力越大振荡幅度越大。
The phenomenon of single bubble condensation in static supercooled water was numerically simulated by the moving particle semi-implicit (MPS) method. The condensation process of saturated steam bubble at different initial pressures and initial diameters was studied. The bubble shape , Equivalent diameter and pressure variation; the initial pressure of bubble is 0.1 ~ 0.5MPa, the initial diameter is 2mm, 3mm and 5mm; the supercooled water pressure is 0.1MPa, the temperature is 70 ℃. The results show that when there is no pressure difference between the two phases, the bubble remains spherical during the condensation process, the bubble equivalent diameter gradually decreases and the pressure is approximately the same. When there is a pressure difference in the phase interface, the bubble gradually changes from spherical to Heart-shaped, half-moon, bubble equivalent diameter and pressure will appear periodic oscillations, and the greater the initial pressure, the greater the oscillation amplitude.