摘要 : In this paper, we report the findings of our investigation on achieving enhanced heat dissipation through buoyancy-induced flow between two vertically oriented heated plates by packing additively manufactured porous media between ... 展开 In this paper, we report the findings of our investigation on achieving enhanced heat dissipation through buoyancy-induced flow between two vertically oriented heated plates by packing additively manufactured porous media between them. Lattice structures comprising five different unit cell topologies: Octet, FD-Cube, FD-Cube paired, TKD, and Cube were selected as the chosen porous media. They were separated from the vertical plates by a finite distance for two values of aspect ratio (plate separation distance-to-height ratio) of ～0.5 and 2. The vertical walls were subjected to a constant heat flux (symmetric and asymmetric). Among the five topologies explored, the Cube lattice structure provided the highest heat dissipation for a wide range of investigated Rayleigh numbers, under different aspect ratios and heating conditions. This superiority can be attributed to the inherent characteristics of the Cube structure, which exhibited the highest permeability, consequently offering the least resistance to the fluid motion. In contrast, the Octet lattice structure, despite its high surface area-to-volume ratio, had the lowest permeability as compared to other topologies and provided the weakest thermal performance. Thermal performance of the remaining topologies-TKD, FD-Cube paired, and FD-Cube-fell between that of the Cube and the Octet. The results clearly indicate that the resultant thermal performance is a complex interplay between the permeability, surface-area-to-volume ratio, and local fluid dynamics. The insights gained from this investigation can offer guidance for designing efficient thermal management systems across various applications involving buoyancy-induced flows. 收起