Compound heat transfer enhancement of a converging-diverging tube with evenly spaced twisted-tapes

被引：64

作者：

Hong Mengna ^{[1
]}

Deng Xianhe ^{[1
]}

Huang, Kuo ^{[1
]}

Li Zhiwu ^{[1
]}

机构：

[1] S China Univ Technol, Key Lab Enhanced Heat Transfer & Energy Conservat, Educ Minist, Guangzhou 510640, Peoples R China

来源：

CHINESE JOURNAL OF CHEMICAL ENGINEERING | 2007年 / 15卷 / 06期

关键词：

compound heat transfer; spaced twisted-tape; converging-diverging tube; swirl flow;

D O I：

10.1016/S1004-9541(08)60008-7

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Pressure drop and compound heat transfer characteristics of a converging-diverging tube with evenly spaced twisted-tapes (CD-T tube) have been investigated experimentally. Swirl was generated by evenly spaced twisted-tape elements which vary in twist ratio and rotation angle. Space ratio also has an important effect on the characteristics. For comparison, experiments in a smooth circular tube and a converging-diverging (CD) tube without twisted-tapes were carried out. The results show that the twisted-tape with twist ratio y=4.72 and rotation angle theta=180 degrees has the best performance among the four types of twisted-tapes presented in this paper. At Reynolds number ranging from 3400 to 20000, when space ratio s=48.6, the heat transfer efficiency index, which increases as the Reynolds number increases, is 0.85-1.21 and 1.07-1.15 compared to that of a smooth circular tube and a CD tube without twisted-tape inserts, respectively.

引用

页码：814 / 820

页数：7

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