This study proposed using a Gyroid structure, a type of triply periodic minimal surface (TPMS), to replace conventional pebble bed configurations and address drawbacks such as inherently low packing fractions, extensive stress concentrations, high flow resistance, and low thermal conductivity. The feasibility of the Gyroid block configuration was evaluated by comparing it with a pebble bed configuration regarding the flow behaviors and heat transfer performance. The flow behavior of the porous block configuration was superior to that of the pebble bed configuration. At the same inlet velocity of 0.1–0.2 m/s, the porous block configuration had a ∼56 % higher average flow velocity and only half the pressure drop. The convective heat transfer coefficient and Nusselt numbers in the porous block configuration were 56–84 % and 2.6–3.1 times higher, respectively, than those in the pebble bed configuration. The effective thermal conductivity of the porous block configuration increased by ∼18 % at an inlet velocity of 0.15 m/s and a temperature of 773–1173 K. This study preliminarily verified the feasibility of the Gyroid structures for tritium breeders in engineering applications and is anticipated to provide new opportunities for the design of tritium breeders with higher lithium densities, remarkable flow behavior, and outstanding thermal performance.

中文翻译：

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使用数值研究比较具有卵石床和 Gyroid 块配置的氚增殖器：流动行为和传热性能


这项研究建议使用陀螺仪结构（一种三周期最小表面（TPMS））来取代传统的卵石床配置，并解决固有的低填充率、广泛的应力集中、高流动阻力和低导热率等缺点。通过将 Gyroid 块配置与卵石床配置的流动行为和传热性能进行比较，评估了 Gyroid 块配置的可行性。多孔块结构的流动行为优于卵石床结构。在 0.1–0.2 m/s 的相同入口速度下，多孔块结构的平均流速高出约 56%，而压降仅为一半。多孔块结构中的对流换热系数和努塞尔数分别比卵石床结构中的对流换热系数和努塞尔数高 56-84% 和 2.6-3.1 倍。在入口速度为 0.15 m/s、温度为 773–1173 K 时，多孔块结构的有效导热率提高了~18%。本研究初步验证了氚增殖器 Gyroid 结构在工程应用中的可行性，预计将为具有更高锂密度、卓越流动行为和出色热性能的氚增殖剂的设计提供新的机会。