Experimental Study of Spring Wire Enhancement of Air Heat Transfer inside TIEC Tubes

2012 ◽  
Vol 446-449 ◽  
pp. 2884-2887
Author(s):  
Yu Gang Wang ◽  
Jia Ping Liu ◽  
Huang Xiang ◽  
Shao Hui Yang

This paper proposes the method of the fresh air heat transfer enhancement through insert Spiral in the tube of TIEC, and researches the heat transfer enhancement and Flow resistance characteristics through experiment when the Re is 6270 - 11016 range. Through regression analysis of the experimental data, obtained the experimental correlation of the heat transfer and drag coefficient of the strengthen tube, at the same time, evaluate the performance of heat transfer enhancement using appropriate method, and give some exploratory analysis.

Author(s):  
Miao Gui ◽  
Qincheng Bi ◽  
Yajun Guo

Both transverse groove tube and twisted tape, as an alternative to traditional smooth tube in shell and tube heat exchanger, are useful techniques for the enhancement of heat transfer. In this paper, an experimental study for the combination of transverse groove tube and twisted tapes was carried out. The flow and heat transfer characteristics of heat transfer oil flowing in the transverse groove tube (TGT) fitted with continuous twisted tape (CT), discontinuous twisted tape (DT) and perforated twisted tape (PT) was investigated with the Reynolds numbers ranging from 600 to 8000, respectively. The effect of the geometrical parameters of twisted tapes on the heat transfer performance was considered. Finally, experimental correlations for friction factor and Nusselt number were developed. The comprehensive performance of heat transfer of the transverse groove tube fitted with twisted tapes was analyzed using traditional method and Entropy Generation Analysis, and the same conclusions can be obtained that the modified heat transfer enhancement tubes, TGT-CT, DT and PT, all show better effects of heat transfer enhancement than ST and ST-CT.


2008 ◽  
Vol 16 (6) ◽  
pp. 849-855 ◽  
Author(s):  
Pengcheng XIE ◽  
Fengxiang LI ◽  
Yumei DING ◽  
Hua YAN ◽  
Changfeng GUAN ◽  
...  

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