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O．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 condensation of single saturated steam bubble in quiescent subcooled water was simulated based on MPS method. The simulation was carried out under different initial bubble pressures and diameters, and the shape formation, bubble equivalent diameter and pressure during condensation were obtained. The initial bubble pressure ranged from 0.1 MPa to 0.5 MPa, and the initial bubble diameter was kept at three different values of 2 mm, 3 mm and 5 mm. The pressure and temperature of the quiescent water was 0.1 MPa and 70~, respectively. The results showed that when the initial bubble pressure difference across phase interphase was zero, the steam bubble was always spherical during condensation, the bubble equivalent diameter decreased and the bubble pressure was almost constant. Otherwise, when the initial bubble pressure difference was larger than zero, the bubble changed from sphere, heart-shape to semi-moon shape during condensation. The bubble pressure and equivalent diameter were in cyclic variations, and the amplitude of variation increased with the initial bubble pressure.
参考文献
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%