3D Numerical Study on Compound Heat Transfer Enhancement of Converging-diverging Tubes Equipped with Twin Twisted Tapes

洪宇翔; 邓先和; 张连山

doi:10.1016/S1004-9541(11)60223-1

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3D Numerical Study on Compound Heat Transfer Enhancement of Converging-diverging Tubes Equipped with Twin Twisted Tapes

香港科技大学化学与生物分子工程系戈登·麦凯教授退休纪念专刊 | Updated：2026-01-06

- 3D Numerical Study on Compound Heat Transfer Enhancement of Converging-diverging Tubes Equipped with Twin Twisted Tapes
- Chinese Journal of Chemical Engineering Vol. 20, Issue 3, Pages: 589-601(2012)
- Affiliations：
  
  Key Lab of Enhanced Heat Transfer and Energy Conservation of Ministry of Education, School of Chemistry and Chemical Engineering, South China University of Technology,Guangzhou,China,510640
- Author bio：
- Funds：
- DOI：10.1016/S1004-9541(11)60223-1
  CLC：
- Published：2012
- Accepted：
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HONG Yuxiang, DENG Xianhe, ZHANG Lianshan. 3D Numerical Study on Compound Heat Transfer Enhancement of Converging-diverging Tubes Equipped with Twin Twisted Tapes[J]. , 2012, 20(3): 589-601.
DOI：

HONG Yuxiang, DENG Xianhe, ZHANG Lianshan. 3D Numerical Study on Compound Heat Transfer Enhancement of Converging-diverging Tubes Equipped with Twin Twisted Tapes[J]. , 2012, 20(3): 589-601. DOI： 10.1016/S1004-9541(11)60223-1.

摘要

Abstract

The paper presents a 3D numerical simulation of turbulent heat transfer and flow characteristics in converging-diverging tubes(CDs) and converging-diverging tubes equipped with twin counter-swirling twisted tapes(CDTs).The effects of Reynolds number(

=10000-20000)

pitch length(

=11.25

22.5 mm)

rib height(

=0.5

0.8

1.1 mm)

pitch ratio(δ=1:8

5:4

8:1)

gap distance between twin twisted tapes(

=0.5

4.5

8.5 mm) and tape number(

6) on Nusselt number(

)

friction factor(

) and thermal enhancement factor(η) are investigated under uniform heat flux conditions

using water as working fluid.In order to illustrate the heat transfer and fluid flow mechanisms

flow structures in CDs and CDTs are presented.The obtained results reveal that all geometric parameters have important effects on the thermal performance of CD and CDT

and both CD and CDT show better thermal performance than plain tube at the constant pumping power.It is also found that the increases in the Nusselt number and friction factor for CDT are

respectively

up to 6.3%-35.7% and 1.75-5.3 times of the corresponding bare CD.All CDTs have good thermal performance with η greater

than 1 which indicates that the compound heat transfer technique of CDT is commendable for the maximum enhanced heat transfer rate.

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