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TECHNICAL PAPERS: Heat Transfer Enhancement

Heat Transfer and Friction Characteristics of Internal Helical-Rib Roughness

[+] Author and Article Information
R. L. Webb

Department of Mechanical Engineering, Pennsylvania State University, University Park, PA 16802e-mail: rlwebb@psu.edu

R. Narayanamurthy, P. Thors

Wolverine Tube, Decatur, AL 35609

J. Heat Transfer 122(1), 134-142 (Oct 02, 1999) (9 pages) doi:10.1115/1.521444 History: Received February 03, 1999; Revised October 02, 1999
Copyright © 2000 by ASME
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References

Figures

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Photos of commercially used helically ribbed tubes; (a) Wolverine Turbo-Chil, (b) Wolverine Turbo-CII, (c) illustration of internally finned tube
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Tubes tested in present work
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Cross section drawing of fin
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Modified Wilson plot for Tube 2
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Table 1 tube performance characteristics: (a) f versus Re, (b) j versus Re, (c) [j/(f/2)]/[j/(f/2)]p versus Re
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Error plots showing fpre/fexp versus Re for the Eq. (6) friction factor correlation
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Error plot showing versus jpre/jexp Re for the Eq. (7) j-factor correlation
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Error plot showing jpre/jexp for the Ravi and Bergles 8 correlation
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Error plot showing jpre/jexp versus Re for the j-factor correlation for tubes in patent
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Error plot showing fpre/fexp versus Re for the f-factor correlation for tubes in patent

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