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Abstract The increasing relevance of additive manufacturing has sparked interest in lattice and triply periodic minimal surfaces (TPMS) for lightweight, high-performance components. These structures have recently gained attention in thermo-fluid applications for enhanced heat transfer capabilities. Despite their potential, gaps remain in understanding how design affects convective heat transfer. Previous studies show higher friction factors in lattice and TPMS compared to smooth pipes, which nevertheless achieve greater efficiency index due to increased surface area and Nusselt number. This study examines various lattice and TPMS structures, like Gyroid, Diamond, and BCC, alongside conventional channels and pin fins. Using steady-state CFD, it analyses pressure drop and heat transfer covering Reynolds numbers from 10,000 to 40,000, representative of gas turbine cooling applications. Numerical simulations are validated against literature experimental data, confirming good agreement. Results identify the gyroid structure as the most efficient, emphasizing the role of increased wetted area in heat transfer enhancement despite the low fin efficiency provided by Inconel and the small wall thickness.
Casini et al. (Mon,) studied this question.