多孔介质部分填充微通道换热器的传热研究

To address the limitations of heat exchange capacity in microchannel heat exchangers, a method involving double-layer porous gradient interlayer filling was proposed. A simulation study was conducted on microchannel heat exchangers with porous interlayers to achieve optimized structural design and enhance the thermal performance of conventional microchannel heat exchangers. By defining comprehensive factors to optimize parameters such as porous layer thickness and porosity, the influence of these parameters on the performance of microchannel heat exchangers was clarified. Under the premise of maintaining constant total thickness and porosity, a dual-layer treatment was applied to the porous interlayer, with parametric studies conducted on the thickness ratio and thin-layer porosity. It was found that using a thick porous interlayer with low porosity on the solid side and a thin porous interlayer with high porosity on the fluid side resulted in varying degrees of optimization in both flow and heat transfer compared to a single-layer porous interlayer. The influence mechanisms and trends of factors such as thickness ratio, thin-layer porosity, and distribution patterns in the dual-layer treatment on the performance optimization of microchannel heat exchangers were identified, providing new design insights for enhancing microchannel heat transfer.