Abstract The enhancement of airside heat transfer in fin-and-tube heat exchanger is crucial for reducing the pumping power, saving materials and so on. In this paper, the authors propose to arrange the winglets radiantly around the tubes on the fin to enhance the airside heat transfer in fin-and-tube heat exchanger. The airside flow and heat transfer characteristic are numerically investigated. The position and the geometric dimensions of the vortex generators are also optimized. The simulation results show that the Colburn j-factor and the friction factor f both increase with VG number. The fin structure has the best comprehensive performance when its VGs are uniformly arranged both in the upwind and backwind regions of the tubes, and at the same time make the enhanced zones the widest in the tube radial direction. With the increase of the VG length, the comprehensive performance factor JF gets lower. The comprehensive performance of the proposed fin with five rows of tubes are demonstrated to be better than a reference fin used in industry with the same fin thickness, tube diameter, fin pitch and tube pitch.

中文翻译：

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翅片管式换热器辐射布置小翼增强空气侧传热

摘要 加强翅片管式换热器空气侧传热对于降低泵送功率、节约材料等具有重要意义。在本文中，作者建议将小翼辐射地布置在翅片上的管周围，以增强翅片管式换热器中的空气侧传热。对空气侧流动和传热特性进行了数值研究。涡流发生器的位置和几何尺寸也进行了优化。仿真结果表明，Colburn j 因子和摩擦因子 f 都随着 VG 数的增加而增加。翅片结构在其VG均匀分布在管子的逆风区和逆风区，同时使增强区在管子径向最宽时，其综合性能最好。随着VG长度的增加，综合性能因子JF变低。所提出的具有五排管的翅片的综合性能被证明优于工业中使用的具有相同翅片厚度、管径、翅片间距和管间距的参考翅片。