The dielectric fluid was normally used to electrically shield high-voltage applications. However, recent studies on the electrohydrodynamic technique using the dielectric fluid were attentively conducted to obtain heat transfer enhancement in keeping with its electrical-insulating feature. This study numerically investigates the electro-thermo-convection in a two-dimensional square enclosure with hot and cold vertical walls. The heat transfer rate in the free convection inside the enclosure can be significantly improved by the injection of space charges and working of the Coulomb force. In this study, we tested several electrode arrangements, including alternately arranged electrode pairs on walls, under the intense charge injection condition. Consequently, the vertical arrangements of the electrode pairs demonstrate a higher heat transfer rate than the horizontal arrangements. The heat transfer coefficient of the vertical electrode pairs at a Rayleigh number of 5000 and an electric Rayleigh number of 200 is larger than three times that of the horizontal electrode pairs. Using fluid with a Prandtl number of 10, the results of the stream lines, isotherms, and space charge distributions are summarized herein for various thermal and electrical buoyant conditions.

介电流体通常用于对高压应用进行电屏蔽。然而，最近对使用介电流体的电流体动力学技术进行了认真的研究，以获得与其电绝缘特性保持一致的传热增强。本研究数值研究了具有冷热垂直壁的二维方形外壳中的电热对流。通过空间电荷的注入和库仑力的作用，可以显着提高外壳内部自由对流的传热率。在这项研究中，我们在强电荷注入条件下测试了几种电极排列，包括在墙壁上交替排列的电极对。最后，电极对的垂直排列表现出比水平排列更高的传热率。瑞利数为5000，电瑞利数为200时，垂直电极对的传热系数比水平电极对大三倍。使用 Prandtl 数为 10 的流体，此处针对各种热和电浮力条件总结了流线、等温线和空间电荷分布的结果。