附加惯性力对气泡破裂的影响

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基金项目:

核反应堆热工水力技术重点实验室资助项目(9140C7101020802)

中央高校基本科研业务费资助重点项目(CDJZR10145501)

Effects of Additional Inertia Force on Bubble Breakup

1. Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education, Chongqing University, Chongqing, 400044, China;
2. CNNC Key Laboratory on Nuclear Reactor Thermal Hydraulics Technology, Nuclear Power Institute of China, Chengdu, 6140041, China

摘要: 从气泡破裂的力平衡机理出发,采用流体体积函数(VOF)模型研究竖直窄流道中单个气泡受到附加惯性力作用后变形破裂的情况。通过定义气泡破裂点处的速度和观察气泡破裂时的颈部最短距离来描述表面张力、附加惯性力大小及初始形状对气泡破裂的影响。结果表明:表面张力、附加惯性力和初始形状对气泡的破裂有很大影响,它们直接影响流体对气泡的射流作用,最终可能导致气泡破裂。
- 气泡 /
- 破裂 /
- 附加惯性力 /
- 流体体积函数
Abstract: Through VOF two-phase flow model,the single bubble deformation and breakup in a vertical narrow channel is numerically investigated in this study based on the force balance at the process of bubble breakup.The effect of surface tension force,the additional inertia force and bubble initial shape on bubble breakup are analyzed according to the velocity variation at the break-up point and the minimum necking size when the bubble is breaking up.It is found that the surface tension force,the additional inertia force and the bubble initial shape have significant effects on the bubble breakup through the fluid injection toward to the bubble,which finally induces the onset of bubble breakup.
- Bubble /
- Breakup /
- Additional inertia force /
- VOF