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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.v6.i2-4.50
pages 105-119

Numerical Investigation of Turbulent Flow and Heat Transfer in Internally Finned Tubes

Xiaoyue Liu
Department of Mechanical Engineering, Aeronautical Engineering and Mechanics, Rensselaer Polytechnic Institute, Troy, NY 12180-3590, USA
Michael K. Jensen
Center for Multiphase Flow, Rensselaer Polytechnic Institute, Troy, NY, USA; University of Wisconsin-Milwaukee, Mechanical Engineering Department Milwaukee, Wisconsin 53201

RÉSUMÉ

A numerical investigation of periodically fully developed, steady, single-phase, turbulent flow and heat transfer in two spirally finned tubes has been first performed. A two-layer turbulence model was applied to model the near-wall turbulence. An unstructured finite-volume method was employed to resolve the complex geometry of internally finned tubes. The effects of grid independence and skewness were extensively examined. In the range of 6,000 < Re < 70,000 and Pr = 4, the length-averaged friction factors and Nusselt numbers were compared with the experimental data of Vlakancic (1996) to validate the accuracy of the turbulence model and numerical method. The computational results match well with the experimental data. Circumferential local friction factors and Nusselt numbers are presented. These results indicate that spiral fins deliver 37% to 50% of the total heat transfer, and the pressure resistance from the leeward and windward sides of the fins is about 30% to 44% of total friction resistance.


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