Analysis on compound heat transfer enhancement performance in outward convex corrugated tube with twisted insert

doi:10.11949/j.issn.0438-1157.20160575

CIESC Journal ›› 2016, Vol. 67 ›› Issue (S1): 195-202.DOI: 10.11949/j.issn.0438-1157.20160575

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Analysis on compound heat transfer enhancement performance in outward convex corrugated tube with twisted insert

HAN Huaizhi, SONG Fuyuan, ZHANG Guolei, YANG Longbin, LI Yanjun

College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, Heilongjiang, China

Received:2016-05-03 Revised:2016-05-20 Online:2016-08-31 Published:2016-08-31
Supported by:
supported by the National Natural Science Foundation of China (51506034).

外凸式波节管结合内插扭带复合强化换热性能分析

韩怀志, 宋福元, 张国磊, 杨龙滨, 李彦军

哈尔滨工程大学动力与能源工程学院, 黑龙江哈尔滨 150001

通讯作者: 宋福元,songfuyuan@hrbeu.edu.cn
基金资助:
国家自然科学基金项目（51506034）。

Abstract

Abstract:

The flow and heat transfer characteristic in outward convex corrugated tube combined with insert twisted tube (CT) was numerically studied based on the three-dimension RNG k-ε model. A comparison is proposed between the numerical results and experimental results in order to check the reliability of numerical model. Comparative study on flow and heat transfer between the CT and conventional smooth tube (ST) is performed in order to review the compound heat transfer enhancement mechanism. The results show that compared with ST, the heat transfer performance and overall heat transfer performance of CT increase by 1.48 and 1.3 respectively, and more obvious in the low Reynolds number. Detached vortex is formed between the corrugatoion and twisted tape in CT, breaking the thermal boundary layer. Disturbance is increased by twisted tape in the main flow region, meanwhile, turbulence kinetic energy increase. Therefore, compound heat transfer enhancement is achieved by synergistic effect between the corrugation and twisted tape.

Key words: outward convex corrugated tube combined with twisted insert, RNG k-ε, compound heat transfer enhancement, overall heat transfer performance

摘要：

针对一种新型的外凸式波节管结合内插扭带（CT）的流动与传热特性进行了RNGk-ε数值模拟研究。数值结果与实验结果进行了对比，验证了数值模型的精确性。将CT和传统的光管结合内插扭带（ST）的流动与传热特性进行了对比研究，揭示了其复合强化换热机理。结果表明CT相比于传统的ST，传热性能以及综合传热性能最多分别提高1.48和1.3倍，并且在低Reynolds数时提高得更加明显。CT在波节与扭带的间隙区域形成了脱体涡旋，破坏了近壁面的热边界层，同时扭带增加了主流区的扰动，使得湍动能增加，因此波节和扭带的协同作用使管内达到了复合强化换热效果。

关键词: 外凸式波节管结合内插扭带, RNG k-&epsilon, , 复合强化换热, 综合传热性能

CLC Number:

TQ028.8

HAN Huaizhi, SONG Fuyuan, ZHANG Guolei, YANG Longbin, LI Yanjun. Analysis on compound heat transfer enhancement performance in outward convex corrugated tube with twisted insert[J]. CIESC Journal, 2016, 67(S1): 195-202.

韩怀志, 宋福元, 张国磊, 杨龙滨, 李彦军. 外凸式波节管结合内插扭带复合强化换热性能分析[J]. 化工学报, 2016, 67(S1): 195-202.

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Analysis on compound heat transfer enhancement performance in outward convex corrugated tube with twisted insert

外凸式波节管结合内插扭带复合强化换热性能分析

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