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Heat transfer enhancement of wavy fin-and-tube heat exchangers via innovative compound designs
International Journal of Thermal Sciences ( IF 4.5 ) Pub Date : 2020-03-01 , DOI: 10.1016/j.ijthermalsci.2019.106211
Ali Sadeghianjahromi , Saeid Kheradmand , Hossain Nemati , Chi-Chuan Wang

Abstract The present study examines some novel improvements in association with the airside performance of wavy fin-and-tube heat exchangers. Effects of waffle height, adding slits on wavy fins and vortex generators on the thermal resistance of wavy fin-and-tube heat exchangers are investigated. Increasing waffle height, imposing slits on the wavy fin, or adding vortex generators can provide 6–10% reduction in thermal resistance subject to constraints of the same pumping power. Yet, the compound design including all these three features together is even more powerful to achieve a 16% reduction of thermal resistance. Increasing waffle height will decrease thermal resistance, but the accompanied pressure drop is even higher. Hence, it is highly recommended that the waffle height should be less than the fin pitch or at a corrugation angle being less than 15°. Punching slits on the top of wavy fin surface can result in 6–7% decrease in thermal resistance. Effect of increasing the width of slits on heat transfer characteristics is negligible. Conversely, increasing the length of slits is much more effective. It can be seen from the results that slits with a length of 12 mm and a width of 1 mm yield 8–10% reduction in thermal resistance.

中文翻译:

通过创新的复合设计增强波纹翅片管换热器的传热

摘要 本研究考察了与波纹翅片管式换热器空气侧性能相关的一些新改进。研究了华夫格高度、在波浪形翅片上增加狭缝和涡流发生器对波浪形翅片管式换热器热阻的影响。在相同泵送功率的限制下,增加华夫饼高度、在波浪形翅片上设置狭缝或添加涡流发生器可以将热阻降低 6-10%。然而,将所有这三个特征结合在一起的复合设计更加强大,可以将热阻降低 16%。增加华夫饼高度会降低热阻,但伴随的压降甚至更高。因此,强烈建议华夫格高度应小于翅片间距或波纹角小于 15°。在波浪形翅片表面的顶部冲孔可导致热阻降低 6-7%。增加狭缝宽度对传热特性的影响可以忽略不计。相反,增加狭缝的长度更有效。从结果可以看出,长度为 12 mm 和宽度为 1 mm 的狭缝使热阻降低了 8-10%。
更新日期:2020-03-01
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