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

›› 2012, Vol. 20 ›› Issue (3): 589-601.

• 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 • 上一篇下一篇

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

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 510640, China

收稿日期:2011-11-05 修回日期:2012-04-03 出版日期:2012-06-28 发布日期:2012-08-17
通讯作者: HONG Yuxiang, E-mail: Cavalier2008@163.com
基金资助:
Supported by the Science and Technology Key Projects of Shanxi Province(2011A080804012)

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

HONG Yuxiang, DENG Xianhe, ZHANG Lianshan

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 510640, China

Received:2011-11-05 Revised:2012-04-03 Online:2012-06-28 Published:2012-08-17
Supported by:
Supported by the Science and Technology Key Projects of Shanxi Province(2011A080804012)

摘要/Abstract

摘要： 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(Re=10000-20000),pitch length(P=11.25,22.5 mm),rib height(e=0.5,0.8,1.1 mm),pitch ratio(δ=1:8,5:4,8:1),gap distance between twin twisted tapes(b=0.5,4.5,8.5 mm) and tape number(n=2,3,4,5,6) on Nusselt number(Nu),friction factor(f) 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.

关键词: heat transfer enhancement, converging-diverging tube, twisted tape, numerical simulation

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(Re=10000-20000),pitch length(P=11.25,22.5 mm),rib height(e=0.5,0.8,1.1 mm),pitch ratio(δ=1:8,5:4,8:1),gap distance between twin twisted tapes(b=0.5,4.5,8.5 mm) and tape number(n=2,3,4,5,6) on Nusselt number(Nu),friction factor(f) 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.

Key words: heat transfer enhancement, converging-diverging tube, twisted tape, numerical simulation

洪宇翔, 邓先和, 张连山. 3D Numerical Study on Compound Heat Transfer Enhancement of Converging-diverging Tubes Equipped with Twin Twisted Tapes[J]. , 2012, 20(3): 589-601.

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.

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

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

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