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Journal of Enhanced Heat Transfer
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ISSN Imprimer: 1065-5131
ISSN En ligne: 1026-5511

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Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.v3.i3.40
pages 201-210

Single-Phase Heat Transfer and Pressure Drop Characteristics of an Integral-Spine Fin Within an Annulus

Mark Kedzierski
NIST
Min Soo Kim
Department of Mechanical Engineering, Seoul National University, Seoul, 08826, Korea

RÉSUMÉ

The laminar, single-phase heat transfer and friction characteristics of a porcupine-like surface (integral-spine fin) within an annulus are presented. The heat-transfer coefficient was determined using a modified version of the Wilson Plot method on a 3m test section. Three fluids were investigated: (1) water, (2) 34% ethylene glycol/water mixture, and (3) 40% ethylene glycol/water mixture. These fluids produced a sufficient variation in the Prandtl number, so that its exponential dependence could be determined. The annulus Reynolds numbers were varied from 100 to 1400 to obtain the Reynolds number exponent. An empirical correlation for the Nusselt number that accounts for the development of the thermal boundary layer is presented. An empirical correlation for the Fanning friction factor is also provided. It is shown that the spines enhance the heat transfer through additional surface area and fluid mixing.


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