Effect of concentric and eccentric porous layers on forced convection heat transfer and fluid flow around a solid cylinder

In this paper, heat transfer and fluid flow around a solid cylinder wrapped with a porous layer in the channel were studied numerically by computational fluid dynamics. The homogeneous concentric and eccentric porous medium around a rigid and solid cylinder is supposed at local thermal equilibrium. The transport phenomena within the porous layer and volume-averaged equations were employed; however, the conservation laws of mass, momentum and energy were applied in the channel. The main purpose of this study is to analyze and compare the heat flux of concentric and eccentric porous layer in the Reynolds number range of 1 to 40 and Darcy numbers of 10-2 to 10-6. It is found that with the decline of Darcy number, the vortex length is increased behind the solid cylinder surface. In addition, the heat flux rate of the cylinder is raised with the increase of Reynolds number. Finally, the results showed that the average Nusselt numbers in different Darcy and Reynolds numbers are higher in the eccentric porous layer than in the concentric porous layer. For example, our findings show that in, and, the average Nusselt number in the eccentric porous layer is higher than the concentric porous layer. © 2024 The author(s).