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Numerical modelling of EHD effects on heat transfer and bubble shapes of nucleate boiling

机译：EHD对核沸腾传热和气泡形状影响的数值模型

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In this article, mathematical and numerical models are developed to study pure electrohy-drodynamic (EHD) effects on heat transfer and bubble shapes when an initial bubble attached to a superheated horizontal wall in nucleate boiling. In the modelling of EHD effects on heat transfer, an undeformed bubble is considered; the electric body force and Joule heat are added to the momentum and energy equations; governing equations for heat, fluid flow and electric fields are coupled numerically and solved using a non-orthogonal body-fitted mesh system with necessary interfacial treatments at the gas-liquid boundary. While, to study the pure effect of EHD on the deformation of the bubble, the evaluation of a deformable bubble without heat transfer is simulated by volume of fluid (VOF) method based on an axial symmetric Cartesian coordinate system. The simulations indicate that EHD can effectively enhance heat transfer rate of nucleate boiling by influencing the motion of the ring vortex around the bubble and that bubble can be elongated due to the pull in axial direction and push in the negative radial direction by the electric field force.
机译：在本文中，开发了数学和数值模型来研究当初始气泡附着在成核沸腾的过热水平壁上时，纯电动流体动力学（EHD）对传热和气泡形状的影响。在EHD对传热影响的建模中，考虑了未变形的气泡。电动势和焦耳热被添加到动量和能量方程中；热，流体流和电场的控制方程在数值上进行耦合，并使用非正交体装配式网格系统进行求解，并在气液边界处进行必要的界面处理。同时，为了研究EHD对气泡变形的纯粹影响，通过基于轴对称笛卡尔坐标系的流体体积（VOF）方法模拟了不传热的可变形气泡的评估。仿真表明，EHD可以通过影响气泡周围的环涡运动来有效地提高核沸腾的传热速率，并且由于电场力的作用，气泡可以沿轴向拉长并沿径向负向推动而伸长。

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