多孔材料填充方式对通道传热效果影响的数值研究

Numerical Investigation of Heat Transfer Enhancement of Parallel-Plate Channel with Different Porous Media Insert Modes

基于结构/非结构同位网格的SIMPLE算法,编写了多孔材料内部流动和传热计算程序。程序中多孔区域动量方程采用Brinkman-Forchheimer拓展Darcy模型,能量方程采用局部热平衡模型。对恒热流边界条件下平行通道沿中心及壁面区域填充多孔材料时的流动和传热特性进行数值分析。分析结果表明,与不填充多孔材料相比,填充多孔材料能有效地强化换热,但同时也造成比较大的压降,其传热性能与多孔材料填充方式以及填充比密切相关。在本文所研究的条件下,在较低雷诺数时,采用大填充比的填充方式更有利于增强平行通道的综合换热性能,且沿通道壁面填充比沿通道核心区填充的效果更好。

Based on the SIMPLE scheme on structured/unstructured collocated meshes,the code used for the prediction of the flow and heat transfer characteristics in porous media domain was achieved,where the momentum equations are formulated by Darcy-Brinkman-Forchheimer model;and the thermal equilibrium model is adopted for energy equation.The heat transfer characteristics of parallel-plate channel with porous inserts along the channel center and wall region were analyzed respectively.The results indicate that compared with the clear channel,the porous inserts can enhance the heat transfer,but cause large pressure drop as well.The performance has a great relationship with the porous media insert modes and filling ratio.Under the conditions of this paper,at low Re number,the channel with porous insert along the wall region has better comprehensive heat transfer performance.