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Title: Effect of Shape and Placement of Twisted Pin Fins in a Rectangular Channel on Thermo-Hydraulic Performance
题目：矩形通道中扭曲销片形状和位置对热工性能的影响研究
Authors: LI Yong, ZHANG Jin, ZHANG Yingchun, ZHANG Jiajie, MA Suxia, SUNDEN Bengt, XIE Gongnan
作者：李勇，张劲，张迎春，张嘉杰，马素霞，本特·苏登，谢公南
单位：太原理工大学电气与动力工程学院，煤电清洁控制教育部重点实验室，高效储热与低碳供热山西省重点实验室，中北大学能源与动力工程学院，瑞典隆德大学，西北工业大学航海学院
Journal of Thermal Science, 2024, 33(5): 1773-1793.
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摘要
Abstract:To enhance the thermo-hydraulic performance of cooling channels, this investigation examines the influence of distinct cross-sectional shapes (i.e., triangular, rectangular, and hexagonal) of twisted pin fins and their arrangements in straight and cross rows. An ambient air cooling test platform was established to numerically and experimentally investigate the flow and heat transfer characteristics of 360° twisted pin fins at Re=15 200– 22 800. The findings reveal that straight rows exhibit higher Nu values than cross rows for triangular and rectangular twisted pin fins, and Nu increases with Re. In contrast, for hexagonal twisted pin fins, only straight rows at Re=19 000 exhibit superior overall thermal performance compared to cross rows. Notably, the heat transfer performance of the cooling channel with hexagonal twisted fins surpasses both triangular and rectangular configurations, especially at high Reynolds numbers (Re=22 800). Although the heat transfer coefficient of the cooling channel with hexagonal twisted fins is significantly enhanced by 132.71% compared to the flat channel, it also exhibits the highest thermal resistance and relative friction among the three types of twisted fins, the maximum of which are 2.14 and 16.55. Furthermore, the hydrothermal performance factor (HTPF) of the cooling channels with different types of twisted pin fins depends on the Reynolds number and arrangement modes. At Re=15 200, the highest HTPF achieved for the cross-row hexagonal twisted pin fins is 0.99.
摘要：本研究综合运用了环境空气冷却实验平台与高精度的数值仿真技术，深入剖析了矩形冷却通道内扭曲销片的截面形态（三角形、矩形及六边形）与顺排/叉排布置策略对热工性能产生的具体影响。特别地，针对360°扭曲销片，在雷诺数（Re）范围15200至22800内进行了详尽探讨。研究发现，在顺排布局下，三角形与矩形扭曲销片展现出了显著的流体动力学与传热性能优化效果，具体表现为努塞尔数（Nu）随着Re的递增而稳步上升，彰显了其在促进流体流动与强化热交换方面的优势。相比之下，六边形扭曲销片在顺排配置下，其传热效率仅在Re约为19000时超越了叉排布局，揭示了特定工况下排列方式对传热特性的重要影响。进一步地，当Re达到高值22800时，六边形扭曲销片展现出了卓越的强化传热能力，其性能较之于三角形与矩形扭曲销片更为突出，相比光滑通道，传热效率提升幅度高达132.71%。然而，这一显著性能提升的同时，也伴随着相对较高的摩擦系数，成为其在实际应用中需权衡考虑的因素之一。综上所述，针对装备有不同类型扭曲销片的冷却通道系统，其综合性能因子（即传热效率与流动阻力的综合考量）的优劣，不仅取决于环境空气的流动状态（特别是雷诺数），还紧密关联于扭曲销片的截面形态及其空间排列方式。这一发现为优化冷却通道设计、提升热工系统效率提供了宝贵的理论依据与实践指导。
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引用格式
LI Yong, ZHANG Jin, ZHANG Yingchun, ZHANG Jiajie, MA Suxia, SUNDEN Bengt, XIE Gongnan, Effect of Shape and Placement of Twisted Pin Fins in a Rectangular Channel on Thermo-Hydraulic Performance, Journal of Thermal Science, 2024, 33(5): 1773-1793.
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