本研究採用積層製造輔助精密鑄造技術製作Gyroid結構熱交換器，並進行其熱流性能特性分析。設計過程導入鑄造模數導向原則以優化澆注系統配置，確保方向性凝固。透過三組不同的澆注系統設計進行模擬分析，探討其充填行為、溫度分布與縮孔預測，並以316L不鏽鋼進行實際鑄造驗證。模擬結果與實際鑄件具有高度一致性，最終設計成功降低鑄造缺陷，並維持幾何完整性。在2-8 L/min流量條件下進行的流動與溫降偏差大多落在±10%範圍內。雖然由於單元尺寸較大（30 mm），導致Nusselt數與熱效能略低於文獻報導，但實驗樣品展現出較低的壓力損失與更高的整體性能指標j/f^(1/3)，在低壓條件下相較於既有Triply Periodic Minimal Surface(TPMS)等微結構熱交換器提升逾30%。本研究結果證實，精密鑄造法可成為取代金屬3D列印之TPMS複雜結構熱交換器的可行且具規模化潛力的製程選擇。目前亦可作為中大尺度TPMS熱交換器設計與製造之實用參考，並具潛力推動航太與功率電子冷卻等領域之節能散熱技術發展。;This study presents the fabrication and thermal-hydraulic characterization of a Gyroid heat exchanger (HE) using additive-manufacturing-assisted investment casting. A casting-modulus-guided design approach was employed to optimize the gating system and ensure directional solidification. Three gating designs were simulated and evaluated for filling behavior, temperature distribution, and shrinkage prediction, followed by experimental casting verification using 316L stainless steel. The results showed strong agreement between simulations and actual casting outcomes. The final design significantly reduced defects and maintained geometric integrity. Flow and heat transfer experiments under 2–8 L/min demonstrated good consistency with steady-state COMSOL simulations, with most deviations in pressure and temperature drop within ±10%. Although the Nusselt number and temperature effectiveness were lower than those reported in the literature due to the relatively large 30 mm unit cell size, the fabricated structure exhibited lower pressure loss and higher overall performance index j/f^(1/3), outperforming previous Triply Periodic Minimal Surface (TPMS) designs by over 30% under low-pressure conditions. These results confirm that, by incorporating casting modulus design principles, investment casting can serve as a viable and scalable alternative to metal 3D printing for fabricating complex TPMS-based heat exchangers. Furthermore, this study offers practical design and manufacturing references for large-scale TPMS heat exchangers and demonstrates promising potential for advancing energy-efficient cooling technologies in aerospace, power electronics, and other high-performance thermal management applications.
