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首页> 外文期刊>Journal of Mechanical Science and Technology >Flow topology, heat transfer characteristic and thermal performance in a circular tube heat exchanger inserted with punched delta winglet vortex generators
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Flow topology, heat transfer characteristic and thermal performance in a circular tube heat exchanger inserted with punched delta winglet vortex generators

机译：插入冲孔三角翼小涡流发生器的圆管热交换器的流动拓扑，传热特性和热性能

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摘要

To improve the heat transfer rate and thermal performance, the punched delta winglet vortex generators, DWVGs, were inserted in the middle of the circular tube heat exchanger. The effects of the flow attack angles and the flow directions were investigated numerically for the Reynolds number Re = 100 - 2000. The finite volume method and the SIMPLE algorithm were used to study. The results are reported in terms of the flow structure, heat transfer behavior and thermal performance evaluation and also compared with the smooth tube with no vortex generators. As the numerical results, the use of the DWVGs in the tube can improve the heat transfer rate and thermal performance by creating the vortex flow through the tested section. The rise of the flow attack angle results in the increasing strength of the vortex flows. The flow attack angle of 25 degrees performs the highest heat transfer rate and thermal performance, while the flow attack angle of 0 degrees gives the reversed results. The computational results reveal that the optimum thermal enhancement factor is around 2.80 at Re = 2000, a = 25 degrees, with the winglet tip pointing downstream. The correlations on both the Nusselt number ratio and friction factor ratio for the DWVG in the tube heat exchanger are presented.
机译：为了提高传热速率和热性能，将冲孔三角翼小涡流发生器DWVG插入了圆管热交换器的中间。数值研究了雷诺数Re = 100-2000时，迎角和流向的影响。采用有限体积法和SIMPLE算法进行了研究。根据流动结构，传热行为和热性能评估报告了结果，并与没有涡流发生器的光滑管进行了比较。作为数值结果，在管中使用DWVG可通过在测试部分中产生涡流来改善传热速率和热性能。流动迎角的增加导致涡流强度的增加。 25度的迎角实现了最高的传热速率和热性能，而0度的迎角给出了相反的结果。计算结果表明，在Re = 2000时（a = 25度），最佳的热增强系数约为2.80，而小翼尖指向下游。给出了管式换热器中DWVG的努塞尔数比和摩擦因数比的相关性。

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