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Technical Brief

Characterization of Heat Transfer by Overlapped-Quadruple Counter Tapes

[+] Author and Article Information
S. Eiamsa-Ard

Department of Mechanical Engineering,
Faculty of Engineering Mahanakorn,
University of Technology,
Bangkok 10530, Thailand
e-mail: smith@mut.ac.th

P. Samravysin

Department of Mechanical Engineering,
Faculty of Engineering Mahanakorn,
University of Technology,
Bangkok 10530, Thailand

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received March 6, 2018; final manuscript received June 30, 2018; published online July 23, 2018. Assoc. Editor: Milind A. Jog.

J. Heat Transfer 140(11), 114501 (Jul 23, 2018) (6 pages) Paper No: HT-18-1132; doi: 10.1115/1.4040785 History: Received March 06, 2018; Revised June 30, 2018

This paper deals with the influence of overlapped-quadruple twisted tape (OQT) and typical quadruple twisted tape (QT) on the enhancing heat transfer rate in a heat exchanger tube. The effects of tube orientation (co-tapes and counter tapes), tape arrangement (cross and parallel arrangements), and overlapped twist ratio (yo/y = 0.625, 0.75, and 0.875) were investigated. The experiments were performed in the turbulent flow regime (5000 ≤ Re ≤ 20,000) under uniform wall heat flux boundary condition, using air as the testing fluid. The experimental results indicates that all OQTs consistently yield higher Nusselt number and thermal performance than QTs. The tapes in cross arrangement show better heat transfer enhancement and thermal performance than the ones in parallel arrangement. Heat transfer, friction loss, and thermal performance increase with decreasing overlapped twist ratio. The maximum thermal enhancement factor (TEF) of 1.58 is achieved by the use of overlapped-quadruple counter tapes in cross arrangement (CC-OQTs) with yo/y = 0.625 at the lowest Reynolds number of 5000.

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Figures

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Fig. 4

Relationship between Reynolds number and Nusselt number: (a) Nu and (b) Nu/Nup

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Fig. 3

Validation test of the plain tube and tube inserted with typical/ST

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Fig. 2

Details of the test section and diagram of the experimental heat transfer facility: (a) heating section and (b) experimental heat transfer setup

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Fig. 1

Details of typical quadruple twisted tapes (QTs; yo/y = 1.0) and P-Co-OQTs at overlapped twist ratio of yo/y = 0.625: (a) front view and (b) top and isometric views of quadruple twisted tapes

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Fig. 5

Influence of the OQTs on heat transfer

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Fig. 6

Relationship between Reynolds number and friction factor: (a) f and (b) f/fp

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Fig. 7

Influence of the OQTs on friction factor

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Fig. 8

Relationship between Reynolds number and thermal enhancement factor

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Fig. 9

Influence of the OQTs on thermal enhancement factor

Tables

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