缩放管内间隔插入旋流片的复合强化传热  

Compound Heat Transfer Enhancement by Inserting Spaced Twisted Tapes in Converging-Diverging Tube

作　　者：洪蒙纳[1] 邓先和[1] 黄阔[1] 李志武[1] 

机构地区：[1]华南理工大学传热强化与过程节能教育部重点实验室,广东广州510640

出　　处：《华南理工大学学报（自然科学版）》2008年第3期16-19,25,共5页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家重点基础研究发展规划项目(G2000026301);国家自然科学基金资助项目(20776046)

摘　　要：为了获得较好的传热性能,提出一种在缩放管内间隔插入旋流片的复合强化传热方法,对以4种不同间隔插入旋流片的缩放管进行了传热与流阻实验研究,并与普通光滑圆管、缩放管空管、内插旋流片的光滑圆管三种结构的结果进行比较.实验结果表明:在实验范围内(3 400<Re<20 000),随着雷诺数的增大,强化传热效果增强;缩放管内插入长68mm、旋转角为180°的旋流片,当旋流片间隔为700mm时,其强化传热性能最佳,传热综合因子分别比光滑圆管、缩放管空管、内插旋流片的光滑圆管提高了21%、15%和16%,说明缩放管内间隔插入旋流片,具有良好的复合强化传热效果.In order to enhance the heat transfer, a method that combines the converging-diverging tube and the spaced twisted tape was presented, and the heat transfer characteristics and flow resistances of four converging-diverging tubes with spaced twisted tapes being inserted in four different spaces were experimentally investigated. The results were then compared with those of the smooth circular tube with or without the twisted tape and the converging-diverging tube without twisted tape. Experimental results indicate that the heat transfer is more greatly enhanced with the Reynolds number increasing in the range of 3400 to 20000, and that, when the twisted tapes with a length of 68 mm and a rotation angle of 180 are inserted in the converging-diverging tube with a space of 700 mm, the tube possesses the best heat transfer performance and the valuation factor of heat transfer respectively increases by 21% , 15% and 16%, as compared with those of the three other above-mentioned tubes. It is thus concluded that the inserting of spaced twisted tapes may greatly enhance the heat transfer performance of the converging-diverging tube.

关 键 词：强化传热 旋流片 缩放管 

分 类 号：TK124[动力工程及工程热物理—工程热物理]