The flow and heat transfer of electrohydrodynamics (EHD) natural convection in the annulus between a rectangular and a circular cylinder is studied numerically. The Rosseland diffusion approximation is used to account for the influence of heat radiation. The inner circular cylinder is considered to be heated and charged with a constant direct current (DC) voltage producing the electric field in the closed cavity. The fundamental Navier-Stokes equations and energy equation are coupled with Maxwell's and Gauss's law to establish the interaction between the velocity, temperature, and electric field for the dielectric fluid. While formulation, we presume that the charged fluid is ideal so that the effect of magnetic induction is negligible. A couple of transformations are used to convert the governing equations into the most appropriate form suitable for implementing the iterative finite difference scheme. According to the findings, the electric field and thermal radiations have a considerable impact on the flow field within the cavity. For instance, an increment in the charge diffusivity number, and the radiation parameter, the intensity of the streamlines, enhances significantly. The isotherms and isolines of electric charge density provide credible information about the heat flow and influence of charge injection. Moreover, the locally distributed Nusselt number at the inner and outer cylinders confirms that thermal radiation is the dominant mode of heat transfer.

数值研究了矩形和圆柱体之间环形空间中电流体动力学 (EHD) 自然对流的流动和传热。Rosseland 扩散近似用于解释热辐射的影响。内部圆柱体被认为被加热并充以恒定的直流 (DC) 电压，从而在封闭的空腔中产生电场。基本的纳维-斯托克斯方程和能量方程与麦克斯韦定律和高斯定律相结合，建立了介电流体的速度、温度和电场之间的相互作用。在公式化时，我们假设带电流体是理想的，因此磁感应的影响可以忽略不计。一些变换用于将控制方程转换为最适合实现迭代有限差分方案的形式。根据研究结果，电场和热辐射对腔内的流场有相当大的影响。例如，电荷扩散数的增加和辐射参数，流线的强度，显着增强。电荷密度的等温线和等值线提供了关于热流和电荷注入影响的可靠信息。此外，内圆柱和外圆柱的局部分布努塞尔数证实了热辐射是热传递的主要模式。电场和热辐射对腔内的流场有相当大的影响。例如，电荷扩散数的增加和辐射参数，流线的强度，显着增强。电荷密度的等温线和等值线提供了关于热流和电荷注入影响的可靠信息。此外，内圆柱和外圆柱的局部分布努塞尔数证实了热辐射是热传递的主要模式。电场和热辐射对腔内的流场有相当大的影响。例如，电荷扩散数的增加和辐射参数，流线的强度，显着增强。电荷密度的等温线和等值线提供了关于热流和电荷注入影响的可靠信息。此外，内圆柱和外圆柱的局部分布努塞尔数证实了热辐射是热传递的主要模式。电荷密度的等温线和等值线提供了关于热流和电荷注入影响的可靠信息。此外，内圆柱和外圆柱的局部分布努塞尔数证实了热辐射是热传递的主要模式。电荷密度的等温线和等值线提供了关于热流和电荷注入影响的可靠信息。此外，内圆柱和外圆柱的局部分布努塞尔数证实了热辐射是热传递的主要模式。