Flow Characterization in Triply-Periodic-Minimal-Surface (TPMS) based Porous Geometries: Part 2 – Heat Transfer

A complex heat transfer takes place between the solid matrix and the fluid within its pores and generally two types of assumptions are widely used for macro-scale modelling of heat transfer: local thermal equilibrium (LTE) when the solid and fluid phases are at the same temperature, and local thermal non-equilibrium (LTNE) when the solid and fluid phases are at different temperatures. A direct numerical simulation has been performed for heat transfer in Triply-Periodic-Minimal-Surface (TPMS) lattices, with identical void fraction and unit-cell size, but different geometrical shape, namely Diamond, I-WP, Primitive, and Gyroid. Further, each lattice derived into three different types of porous structures by designing second sub-volume as solid (Type 1), fluid (Type 2), and microporous zones (Type 3). The heat transfer in the hydrodynamically and thermally developed flow in a square mini-channel filled with these porous inserts for a range of Reynolds number \(0.01