In this study, we comparatively analyzed the convective heat transfer performance of single-wall and double-wall Gyroid TPMS (Triply Periodic Minimal Surface) structures. Using computational fluid dynamics (CFD), we evaluated the average convective heat transfer coefficients under constant surface temperature conditions for both constant velocity and constant pressure flow. Although both structures maintained the same fluid volume, the double-wall configuration increased the surface area by approximately 1.8 to 1.9 times, resulting in enhanced heat transfer performance. Under constant velocity conditions, the double-wall structure exhibited an average convective heat transfer coefficient that was 1.3 to 1.4 times higher than that of the single-wall structure. Under constant pressure conditions, we observed an increase of 1.06 to 1.1 times. Despite the double-wall structure leading to greater pressure losses due to increased shear stress from the formation of microchannels, it still maintained improved heat transfer performance even with reduced mass flow rates under constant pressure conditions. These findings provide fundamental data for designing TPMS-based cooling systems and optimizing additive manufacturing processes.
This paper describes a new design method for constructing a heat exchanger computational model comprising TPMS (Triply Periodic Minimal Surface) core structures. These TPMS-Based core structures cannot be designed using the existing CAD systems, especially for heat exchangers with a high level of geometric complexity. This paper introduces a new implicit design algorithm based on the VDF (Volumetric Distance Field) calculation. All geometric components, including the TPMS-based core structures, heat exchanger exterior shapes, a set of parts for inlets and outlets, are represented by the VDF in a given design area. This enables the efficient design of computational models for the arbitrary-complex heat exchangers. The proposed design method extends the 2D flow pattern of the existing CHE into the 3D flow pattern, providing high heat transfer efficiency and low-pressure drop. Investigation of the design results and manufactured prototypes using the AM (Additive Manufacturing) technology showed that the proposed TPMS CHE design method can open a new paradigm for generating high-performance next-generation CHEs which cannot be designed and manufactured with the existing CAD and CAM technologies.
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Analysis of Convective Heat Transfer Coefficient of Double-wall Gyroid TPMS under Constant Surface Temperature Conditions Sohyun Park, Jihyun Sung, Dahye Kim, Kunwoo Kim Journal of the Korean Society for Precision Engineering.2025; 42(12): 1071. CrossRef
A Study on Design and Fabrication Characteristics of TPMS Structures Hyun Kim, Kwang-Kyu Lee, Dong-Gyu Ahn Journal of the Korean Society of Manufacturing Process Engineers.2024; 23(2): 52. CrossRef
Triply Periodic Minimal Surface Structures: Design, Fabrication, 3D Printing Techniques, State‐of‐the‐Art Studies, and Prospective Thermal Applications for Efficient Energy Utilization Mohamed G. Gado, Oraib Al‐Ketan, Muhammad Aziz, Rashid Abu Al‐Rub, Shinichi Ookawara Energy Technology.2024;[Epub] CrossRef
A Study on the Dissolution Characteristics of 3D Printed Tablet with Lattice Structures Sang Hoon Lee, Seung Min Oh, Seo Rim Park, Seok Kim, Young Tae Cho Journal of the Korean Society for Precision Engineering.2023; 40(8): 633. CrossRef
Design analysis of the “Schwartz D” based heat exchanger: A numerical study Reza Attarzadeh, Marc Rovira, Christophe Duwig International Journal of Heat and Mass Transfer.2021; 177: 121415. CrossRef
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