Effect of surface roughness on the thermal behavior of Schwarz-D TPMS lattice structures

Résumé fourni par la source

In additive manufacturing (AM), triply periodic minimal surface (TPMS) structures are widely employed to construct compact, high-performance heat exchangers (HEs). However, surface roughness inherent to AM represents a major challenge for the practical application of TPMS heat exchangers. This study employs artificial surface roughness based on a perturbation-based model to replicate surface irregularities, thereby evaluating the effects of AM-induced surface roughness on heat transfer and fluid flow performance. The simulation results indicate that the roughness amplitude parameter A and spatial wave number w 2 will induce local convective heat transfer coefficient h concentration. The larger the A and w 2 , the stronger the concentration effect is. The performance evaluation shows that the TPMS lattice structure without surface roughness can achieve the highest overall heat transfer coefficient U , while exhibiting the lowest pressure drop. In terms of performance evaluation criterion j hot f hot 1 / 3 , structure without surface roughness outperforms others. This work demonstrates that the roughness-induced geometric deviations have a significant influence on thermo-hydraulic performance. For the investigated cases, the increased hydraulic penalty outweighs the heat transfer enhancement.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.