Numerical simulation of bubble dynamics in the gravitational and uniform electric fields
Numerical simulation of bubble dynamics in the gravitational and uniform electric fields
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DOI：
10.1080/10407782.2017.1330072
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发表时间：
2017-05
期刊：
影响因子：
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通讯作者：
Yanning Wang;Dongliang Sun;Aolin Zhang;Bo Yu
中科院分区：
文献类型：
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作者：
Yanning Wang;Dongliang Sun;Aolin Zhang;Bo Yu
采用基于FLUENT的流体体积、水平集和光滑物理参数（VOF+LS+SPP）耦合方法模拟了引力场和均匀电场下的气泡动力学。假设气泡和周围介质都是介电常数不变但介电常数不同的理想介质。系统地研究了电键数、介电常数比、莫顿数和厄特沃斯数对单个气泡变形和上升运动的影响。仿真结果表明，垂直电场使气泡沿电场方向拉长，气泡上升速度加快。电键数对气泡变形和上升速度的影响远大于介电常数比。不同Morton数下的气泡在电场中的行为相似，而不同Eotvos数下的气泡在电场中的行为则完全不同。电场对气泡雷诺数的影响在不同Morton数下变化不大，但随着Eotvos数的增加而明显减小。
ABSTRACT A coupled volume-of-fluid, level set, and smoothed physical parameter (VOF+LS+SPP) method based on FLUENT is used to simulate bubble dynamics in the gravitational and uniform electric fields. Both of the bubble and surrounding medium are assumed to be perfect dielectrics with constant but different permittivities. The effects of electric Bond number, permittivity ratio, Morton number, and Eotvos number on the deformation and rising motion of a single bubble are systematically investigated. Simulation results show that a vertical electric field elongates the bubble along the electric field direction and accelerates the bubble rising. The electric Bond number has a much greater effect on bubble deformation and rising velocity than the permittivity ratio. The bubble behaviors in the electric field are similar for different Morton numbers but totally different for various Eotvos numbers. The influence of electric field on bubble Reynolds number changes a little for different Morton numbers but decreases distinctly with the increase of Eotvos number.