Study on the Collapse Process of Cavitation Bubbles Near the Concave Wall by Lattice Boltzmann Method Pseudo-Potential Model
Study on the Collapse Process of Cavitation Bubbles Near the Concave Wall by Lattice Boltzmann Method Pseudo-Potential Model
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DOI：
10.3390/en13174398
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发表时间：
2020-08
期刊：
影响因子：
3.2
通讯作者：
Yang Liu;Yong Peng
中科院分区：
文献类型：
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作者：
Yang Liu;Yong Peng
本文采用格子Boltzmann赝势模型，耦合Carnahan-Starling（C-S）状态方程和Li力格式，研究了凹壁附近空泡的溃灭过程。主要包括单、双空化泡在近壁区的溃灭过程。研究表明，随着附加压力的减小，单个空化泡的溃灭速度变慢，微射流的速度也相应减小。此外，如果附加压力进一步降低，则不会发现空化泡的第二次崩溃。当空泡与垂直方向成不同角度时，其溃灭方向始终垂直于壁面。当双空泡垂直排列时，随着相对距离的增加，上层空泡的溃灭过程加快。当气泡间的相对距离足够大时，上层气泡不会发生二次坍塌。另一方面，当两个空泡水平排列时，空泡之间的抑制作用随着空泡之间相对距离的增大而减小，空泡溃灭位置从下部向上部移动。
In this paper, the lattice Boltzmann pseudo-potential model coupled the Carnahan–Starling (C-S) equation of state and Li’s force scheme are used to study the collapse process of cavitation bubbles near the concave wall. It mainly includes the collapse process of the single and double cavitation bubbles in the near-wall region. Studies have shown that the collapse velocity of a single cavitation bubble becomes slower as the additional pressure reduces, and the velocity of the micro-jet also decreases accordingly. Moreover, the second collapse of the cavitation bubble cannot be found if the additional pressure reduces further. When the cavitation bubble is located in different angles with vertical direction, its collapse direction is always perpendicular to the wall. If the double cavitation bubbles are arranged vertically, the collapse process of the upper bubble will be quicker, as the relative distance increases. When the relative distance between the bubbles is large enough, no second collapse can be found for the upper bubble. On the other hand, when two cavitation bubbles are in the horizontal arrangement, the suppression effect between cavitation bubbles decreases as the relative distance between the bubbles increases and the collapse position of cavitation bubbles moves from the lower part to the upper part.