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TECHNICAL PAPERS: Heat Transfer Enhancement

Heat Transfer Enhancement Using Shaped Polymer Tubes: Fin Analysis

[+] Author and Article Information
Zhihua Li, Jane H. Davidson, Susan C. Mantell

Department of Mechanical Engineering, University of Minnesota, 111 Church St., S.E., Minneapolis, MN

J. Heat Transfer 126(2), 211-218 (May 04, 2004) (8 pages) doi:10.1115/1.1683663 History: Received May 08, 2003; Revised September 15, 2003; Online May 04, 2004
Copyright © 2004 by ASME
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References

Figures

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Tube bundle of ‘shaped’ polymer tubes
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Shaped tubes (a) baseline circular, (b) lenticular, (c) teardrop, and (d) oval. The area outside the dashed circle is considered the fin
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Differential element for a one-dimensional energy balance for a single-sided fin on a shaped tube (a) lenticular and (b) oval
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Dimensionless excess temperature ratio as a function of Biot number and the dimensionless coordinate λ=r/l (a) lenticular fin, (b) oval fin, and (c) lenticular fin (dashed line) and oval fin (solid line) with λb=0.5
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Shaped tube efficiency plotted as a function of Biot number and λb (a) lenticular tube, (b) teardrop tube, and (c) oval
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Comparison of the shaped tube efficiencies for tubes with (a) λb=0.3, (b) λb=0.5, and (c) λb=0.8
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Predicted heat transfer efficiency of an oval shaped tube for air flows with 2000≤Re≤20,000
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Comparison of the shaped tube efficiency determined from one-dimensional and two-dimensional solutions (a) lenticular tube, (b) teardrop tube, and (c) oval tube

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