The design of a thin-walled heat dissipation structure incorporating vortex-porous block coupling

Abstract In order to investigate the coupled heat transfer effects of rotating cylinders and porous media within a two-dimensional channel, a numerical simulation study was conducted on a two-dimensional channel incorporating both rotating cylinders and porous media. Numerical simulations were performed to obtain the flow field, temperature field, total friction coefficient, as well as local and overall Nusselt numbers, and comprehensive performance evaluation indices within the two-dimensional channel. The effects of the rotating cylinder's flow position, distance from the lower wall, and rotational angular velocity on the channel's heat transfer characteristics were systematically investigated. The results demonstrate that the coupled heat transfer between the rotating cylinder and the porous medium can significantly enhance heat transfer performance within the channel. Nevertheless, the heat transfer enhancement effect gradually diminishes along the flow direction. The coupled heat transfer between the rotating cylinder and the porous medium is confined to the region downstream of the cylinder and does not affect the upstream section. The presence of the rotating cylinder increases the total friction coefficient in the channel, and a comprehensive performance evaluation index is employed to assess the overall trade-off between enhanced heat transfer and the associated increase in frictional resistance. The optimal heat transfer performance within the channel is achieved at xc = 45 mm, yc = 3 mm, and ω = 9 rad/s.