Experimental study on effect of heat transfer enhancement for single-phase forced convective flow with twisted tape inserts

2017 ◽  
Vol 106 ◽  
pp. 877-883 ◽  
Author(s):  
Changzhong Man ◽  
Xiaogang Lv ◽  
Jingwei Hu ◽  
Peiyan Sun ◽  
Yunbang Tang
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Heat Transfer Enhancement ◽  
Convective Flow ◽  
Single Phase ◽  
Twisted Tape ◽  
Transfer Enhancement ◽  
Forced Convective Flow

Enhanced Heat Transfer in Single-Phase Forced Convection in Tubes due to Helical Swirl Generated by Twisted-Tape Inserts

2012 ◽  
Author(s):  
Arthur E. Bergles ◽  
Raj M. Manglik
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Enhancement ◽  
Single Phase ◽  
Fluid Motion ◽  
High Heat ◽  
Twisted Tape ◽  
Transfer Enhancement ◽  
Transfer Coefficients ◽  
Heat Exchanger Design ◽  
High Heat Transfer

Very high heat transfer enhancement can be achieved in single-phase flows by using twisted-tape inserts in circular tubes. The primary convection mechanism is the generation of helical swirl or secondary fluid motion that is induced by the helical curvature of the tape insert. This promotes cross-stream mixing and sharper wall gradients, which are further aided by the increased flow velocity due to the tube partitioning and blockage along with an effectively longer helical flow length. These phenomena are scaled for both laminar and turbulent flow regimes, and an evaluation of the transition is also given to highlight the damping effects of tape-generated swirl. The nature of swirl and its dimensionless scaling, and concomitant development of predictive correlations for heat transfer coefficients and friction factors are discussed. Finally, a brief discussion of the quantification of heat transfer enhancement by means of twisted tapes is given so as to extend their application in heat exchanger design.

Experimental Study on the Heat Transfer Enhancement by the Combination of Transverse Groove Tube and Twisted Tape Inserts

2016 ◽  
Author(s):  
Miao Gui ◽  
Qincheng Bi ◽  
Yajun Guo
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Heat Transfer Enhancement ◽  
Reynolds Numbers ◽  
Geometrical Parameters ◽  
Twisted Tape ◽  
Transfer Enhancement ◽  
Tube Heat Exchanger ◽  
Twisted Tapes ◽  
Performance Of Heat Transfer

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.

Sign in / Sign up

Export Citation Format

Share Document