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移动粒子半隐式(Moving Particle Semi-implicit,MPS)数值方法在追踪汽液相界面上较传统网格方法有很大优势,本研究基于MPS方法对过冷水中单个蒸汽泡的冷凝行为进行了数值模拟研究。计算结果与Kamei的实验结果符合较好并表明,汽泡冷凝寿命与汽泡初始尺寸呈近似线性关系,低过冷度下大汽泡的变形会加速其冷凝,高过冷度下会出现冷凝波动现象。此外还利用MPS方法对汽泡对绝热融合行为进行了数值模拟,分析了汽泡在融合过程中的形变特性、融合前后汽泡上升速度的变化。本研究揭示了直接接触汽泡冷凝换热及汽泡对绝热融合行为的一些规律特征,也为MPS进一步应用于汽泡动力学数值模拟打下基础。
Moving Particle Semi-implicit (MPS) numerical method has a great advantage over traditional grid method in tracing vapor-liquid interface. Based on MPS method, the condensation behavior of single steam bubble in supercooled water was studied Numerical simulation research. The calculated results are in good agreement with the experimental results of Kamei and show that the lifetime of bubble condensation is approximately linear with the initial bubble size. The deformation of large bubbles at low undercooling accelerates the condensation, and condensation occurs at high undercooling Fluctuation phenomenon. In addition, MPS method was used to simulate the adiabatic fusion behavior of bubble pairs. The deformation characteristics of bubble during the fusion process and the change of bubble rise velocity before and after fusion were analyzed. This study reveals some regular characteristics of direct contact with bubble condensation heat transfer and bubble-to-bubble adiabatic fusion behavior, and lays a foundation for further application of MPS in bubble dynamics numerical simulation.