Investigation on flow and heat transfer in various channels based on triply periodic minimal surfaces (TPMS)

Heat exchangers are one of the key components to ensure the safe and efficient operation of nuclear energy systems. Additive manufacturing offers the processing solutions of advanced heat exchangers based on triply periodic minimal surfaces (TPMS). TPMS has superior mechanical and thermal–hydraulic performance that provides excellent energy-saving potential in the energy systems. In this study, I-WP, Neovius, Fischer-Koch S, Primitive surface-based heat transfer channels with different volume shares are constructed in three dimensions. The enhanced heat transfer mechanisms of TPMS topologies are identified and parametric analysis on the thermal–hydraulic performance is performed. The results indicate that the secondary flows, periodic flow acceleration/deceleration and constant changes in flow directions play key roles in convective heat transfer of TPMS topologies. Based on a large amount of simulation data, empirical correlations for Nusselt number and friction factor in the turbulent regime are established. This study provides a database for the design and application of TPMS-based heat exchangers, which contributes to the energy-saving and sustainable future target.