Investigation of the natural convection in a dielectric fluid confined inside a vertical slot subject to a constant horizontal temperature gradient and a high-frequency electric field was revisited. The thermoelectric coupling produces a dielectrophoretic force which contains a term called electric buoyancy associated with an electric gravity. Similar to the Archimedean buoyancy, this force can induce thermo-electro-convective instability in a stable fluid flow. Including the feedback effect of the electric field on the flow, a three-dimensional linear stability analysis is performed to characterize the instability induced by this force. Different critical modes are found depending on the intensity of the electric field: stationary hydrodynamic modes, oscillatory thermal modes and stationary electric modes. The threshold of the electric modes is independent of the Prandtl number in contrast with the threshold of the hydrodynamic and thermal modes. The obtained results are compared with those of previous studies.

再次研究了限制在垂直槽内的电介质流体中的自然对流，该流体受恒定的水平温度梯度和高频电场的影响。热电偶合产生介电泳力，该介电泳力包含与电引力相关的称为电浮力的术语。与阿基米德浮力相似，此力可以在稳定的流体流动中引起热电对流不稳定。包括电场对流体的反馈效应，进行了三维线性稳定性分析，以表征由该力引起的不稳定性。根据电场强度，可以找到不同的临界模式：静态流体动力模式，振荡热模式和静态电模式。与流体动力和热力模式的阈值相反，电模式的阈值与普朗特数无关。将获得的结果与以前的研究进行比较。