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Research Papers: Heat Exchangers

Thermal Hydraulic Study of a Single Row Heat Exchanger With Helically Finned Tubes

[+] Author and Article Information
H. Huisseune

Department of Flow, Heat, and Combustion Mechanics, Ghent University, Sint-Pietersnieuwstraat 41, B9000 Gent, Belgiumhenk.huisseune@ugent.be

C. T’Joen

Department of Flow, Heat, and Combustion Mechanics, Ghent University, Sint-Pietersnieuwstraat 41, B9000 Gent, Belgiumchristophe.tjoen@ugent.be

P. Brodeoux, S. Debaets, M. De Paepe

Department of Flow, Heat, and Combustion Mechanics, Ghent University, Sint-Pietersnieuwstraat 41, B9000 Gent, Belgium

Mean deviation=(1/M)(1M(|NucorrNuexp|/Nuexp))100%.

J. Heat Transfer 132(6), 061801 (Mar 19, 2010) (8 pages) doi:10.1115/1.4000706 History: Received November 12, 2008; Revised October 16, 2009; Published March 19, 2010; Online March 19, 2010

In this study, the heat transfer and friction correlation of a single row heat exchanger with helically finned tubes are experimentally determined. The transversal tube pitch was parametrically varied. A detailed description of the test rig and the data reduction procedure is given. A thorough uncertainty analysis was performed to validate the results. The proposed heat transfer correlation can describe 95% of the data within ±11% and shows a 4.49% mean deviation. The friction correlation predicts 95% of the data within ±19% with a mean deviation of 6.84%. The new correlations show the same trend as most correlations from open literature, but none of the literature correlations are able to accurately predict the results of this study.

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Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Tested monofinned tube: (a) tube with helical fins and (b) cross section

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Figure 2

Experimental setup: open air wind tunnel and a closed water cycle. The dimensions of the wind tunnel are also indicated (in mm) (→: air flow; →: water flow)

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Figure 3

View of the outlet section of the wind tunnel: position of the thermocouples measuring the outlet air temperature

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Figure 4

Experimental data and Nu correlation independent of Xt/dext (Eq. 17) plotted versus the minimum-area Reynolds number Rec

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Figure 5

Comparison of the heat transfer correlation (Eq. 18) with the experimental data

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Figure 6

Comparison of Eq. 18 with heat transfer characteristics from open literature

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Figure 7

Experimental friction factors plotted versus the minimum-area Reynolds number Rec for different transversal tube pitches

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Figure 8

Comparison of the friction correlation (Eq. 19) with the experimental data

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Figure 9

Comparison of Eq. 19 with friction characteristics from open literature

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