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TECHNICAL BRIEFS

Numerical Investigation of the Thermally Developing Flow in a Curved Elliptic Duct With Internal Fins

[+] Author and Article Information
P. K. Papadopoulos

Department of Engineering Science, University of Patras, GR 26500 Patras, Greecep.papadopoulos@des.upatras.gr

P. M. Hatzikonstantinou

Department of Engineering Science, University of Patras, GR 26500 Patras, Greece

J. Heat Transfer 129(6), 759-762 (Oct 17, 2006) (4 pages) doi:10.1115/1.2717254 History: Received July 23, 2005; Revised October 17, 2006

The hydrodynamically fully developed and thermally developing flow inside a curved elliptic duct with internal longitudinal fins is studied numerically. The duct is subjected to the uniform temperature boundary condition on its wall and fins. The local and mean Nusselt numbers are examined for various values of the Dean and Prandtl numbers, the cross-sectional aspect ratio, and the fin height. The characteristics of the optimum duct, which achieves enhanced heat transfer rates combined with low friction losses, are determined in terms of the aspect ratio and the fin height.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Geometry and coordinate system

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Figure 2

Comparison of results for the local Nusselt number between the present work and Akiyama (1) for the case of a curved circular finless duct

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Figure 3

Variation of the local Nu with z∕Pe for De=62, b∕a=0.8, Pr=0.7, 7, and various fin heights

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Figure 4

Variation of the Nusselt number with De for Pr=7 and aspect ratio b∕a=0.8 and 0.5

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Figure 5

Dependence of the ratio Nu∕fRe on the fin height and the aspect ratio in: (a) a straight duct; (b) a curved elliptic duct with dPa∕dz=−40,000, κ=0.1, Pr=0.7; and (c) curved elliptic duct with dPa∕dz=−40,000, κ=0.1, and Pr=7

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