平板通道内填充多孔物块的优化换热分析

采用数值模拟的方法,对恒热流壁面平板通道填充多孔物块的流动换热进行了相关研究,分别采用Brinkman-Forchheimer-Darcy流动模型和局部热平衡模型描述多孔介质内的流动和换热,重点研究了多孔物块的填充位置和物块高度对流动换热的影响.结果表明:当多孔物块在纵向上位于通道中心区域时,强化传热效果最好;随着填充多孔物块高度的增加,壁面Num数呈现先增大后减小的趋势,但流动阻力系数却不断增大.

Optimal Analysis of Heat Transfer in Parallel Plate Channels with Porous Blocks

The flow and heat transfer of the Parallel Plate Channel with constant heat-flux walls filled with porous blocks was relevantly studied by the numerical simulation method. By using the Brinkman-Forchheimer-Darcy flow model and the local thermal equilibrium model, the flow and heat transfer in porous blocks was described, and the impact of the position of porous blocks and height of porous blocks on the flow and heat transfer was mainly studied. The results show that when porous blocks are longitudinally located in the central part of the channel, the heat transfer is maximized, and that with the increase of the height of porous blocks, the average Nu number on the inside wall increases at first and then decreases, butthe flow resistance coefficient continually increases.