电场作用下单气泡行为的数值模拟

Numerical simulations of single bubble behavior in DC electric fields

为了解电场强化沸腾换热的机理,分析了单气泡在电场作用下的行为特点。通过求解不可压缩流体的连续性方程,加入电场力的动量方程和VOF(volume of fluid)方程,得到了单气泡在电场下从壁面脱离的过程。结果发现,气泡在电场下脱离时间变短,并沿着电场方向伸长。气泡内部流动加剧,形成多个涡。结果表明,电场作用下气泡的行为特点产生显著的变化。

The analysis of single bubble behavior in electric fields will improve understanding of the electric enhancement mechanism in boiling heat transfer. The continuity equation, the momentum equations with the electric force term and VOF equation for incompressible flow were numerically solved to investigate the bubble behavior in a DC electric field. The results show that the bubble is elongated along the electric field direction and that the bubble departure time decreases in the electric field. The flow inside the bubble intensifies and the number of vortexes increases with increasing electric field strength. The bubble behavior in an electric field has notable changes.