Yin Jianyong, Zhang Yongxue, Zhu Jianjun, Zhang Yuning, Li Shida
College of Mechanical and Transportation Engineering, China University of Petroleum-Beijing, Beijing 102249, China; Beijing Key Laboratory of Process Fluid Filtration and Separation, China University of Petroleum-Beijing, Beijing 102249, China.
College of Mechanical and Transportation Engineering, China University of Petroleum-Beijing, Beijing 102249, China; Beijing Key Laboratory of Process Fluid Filtration and Separation, China University of Petroleum-Beijing, Beijing 102249, China.
Ultrason Sonochem. 2021 Jan;70:105297. doi: 10.1016/j.ultsonch.2020.105297. Epub 2020 Jul 29.
Thermodynamic behaviors and interactions between bubble pairs are important to better understand the cavitation phenomena. In this study, a compressible two-phase model, accounting for thermal effects to investigate the thermodynamic behaviors and interactions between bubble pairs, is developed in OpenFOAM. The volume of fluid (VOF) method is adopted to capture the interface. Validations are performed by comparing the simulation results of a single bubble and bubble pairs with corresponding experimental data. The dynamical behaviors of bubble pairs and their thermodynamic effect at different relative distances γ are investigated and discussed, which help reveal the bubble cloud dynamics. The quantitative analysis of γ effects on the maximum temperature during bubble collapse is performed with three distinct stages identified. For a single bubble collapsing near the rigid surface, the thermodynamic characteristics at different relative distances are similar to that of the bubble pairs, but the maximum temperature is higher since the single bubble can collapse to a smaller volume.
气泡对之间的热力学行为和相互作用对于更好地理解空化现象至关重要。在本研究中，在OpenFOAM中开发了一个可压缩两相模型，该模型考虑热效应以研究气泡对之间的热力学行为和相互作用。采用流体体积（VOF）方法捕捉界面。通过将单个气泡和气泡对的模拟结果与相应的实验数据进行比较来进行验证。研究并讨论了不同相对距离γ下气泡对的动力学行为及其热力学效应，这有助于揭示气泡云动力学。对γ对气泡坍塌过程中最高温度的影响进行了定量分析，并确定了三个不同阶段。对于在刚性表面附近坍塌的单个气泡，不同相对距离下的热力学特性与气泡对相似，但最高温度更高，因为单个气泡可以坍塌到更小的体积。
