电场对三角形微槽热沉轴向干涸特性的影响

Effect of Electric Field on Dryout Characteristics in Triangular Microgroove Heat Sinks

将电流体动力学(EHD)主动强化换热技术应用到微槽换热器中是解决化工、能源领域散热问题的一种有效手段。参考自适应理论建立了一维轴向无量纲分析模型,并将库仑力、介电电泳力和电致伸缩力都引入进了模型中,研究EHD效应对三角形毛细微槽热沉内液体干涸特性的影响。研究发现,电场能有效提升微槽内液体干涸长度。三角微槽内液体的干涸高度以及自适应长度都随着电场强度的增加而增加。本文也得到了不同电场强度下三角微槽内液体曲率半径沿轴向的变化,发现随着电场强度的增加,相同截面上的液膜曲率半径增加,且离微槽入口越远的位置,曲率半径增加幅度更大。

Application of electrohydrodynamics（EHD） active heat transfer technology in the microgroove heat exchanger is an effective means to solve the heat dissipation problem in the chemical and energy fields. In this paper, a dimensionless analytical model was established based on the accommodation theory. And then coulomb force, dielectrophoretic force and electrostrictive force were introduced to the model to study the effect of electric field on dryout characteristics of evaporating liquid in triangular microgroove heat sinks. The results showed that the electric field raised dryout length effectively. Dryout length as well as accommodation length increased with increasing of electric field intensity. Axial radius of curvature in the same cross section increased with increasing of electric field intensity. The farther away from the entrance of the microgroove, the larger improvement of radius of curvature.