电场作用下矩形肋表面汽泡运动规律研究

Investigation of Boiling Bubble Dynamics on a Rib Heating Sarface Under an Electeic Field

通过电场加强热交换的方法属于有源强化方法,而改变加热面结构属于无源强化方法。以往研究者的研究侧重于光滑表面、加热管或加热线表面。在光滑表面增加肋结构,可以产生所谓的"场陷效应",处于不同位置的汽泡所受电场力的大小和方向均不相同,因此电场强化沸腾换热原理也与光滑表面的情况不同。本文将有源技术与无源技术相结合,首先通过实验方法研究了电场作用下处于肋底部和肋上部的汽泡的运动规律,然后通过数值计算方法从汽泡受力角度分析处于不同肋高位置时汽泡的受力情况,进而得出汽泡运动规律,理论计算结果与实验观察到的现象能够很好地吻合,此研究对深入理解电场强化换热技术有重要的意义。

Heat transfer enhancement by electric fields is an active heat transfer enhancement technology.Use a special surface to enhance heat transfer is a passive technology.In this paper,we combine the two technologies.Adding ribs on a smooth heating surface can produce the so-called ＂field trap effect＂.At the different position of ribs,the electric field force on bubbles are not the same.Firstly,in experiments we studied the moment of bubbles on rib surfaces,and then we use numerical method to simulate the experimental conditions.The experimental data agree well with simulated data.