A parametric study has been performed on turbulent flow and heat transfer in internally finned tubes. For a rectangular fin profile, the effects of fin number N, fin width s, fin height H, and helix angle γ were numerically investigated for the conditions of and In addition, the performance of three fin profiles—rectangle, triangle, and round crest—with the same fin heights, width, and helix angles were compared for Reynolds numbers between 10,000 and 70,000. Rectangular and triangular fins behave similarly; for some geometric conditions the round crest fin has lower friction factors and Nusselt numbers (17 and 10 percent, respectively) than the rectangular fin. However, when the number of fins is large, the round crest fin can have larger friction factors (about 16 percent). Damping of turbulence energy in the interfin region is credited for the reversal of the typical trends.
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Geometry Effects on Turbulent Flow and Heat Transfer in Internally Finned Tubes
Xiaoyue Liu, Mem. ASME, Mechanical Engineer,,
Xiaoyue Liu, Mem. ASME, Mechanical Engineer,
GE Corporate Research and Development Center, 1 Research Circle, Niskayuna, NY 12309
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Michael K. Jensen, Fellow ASME, Professor,
Michael K. Jensen, Fellow ASME, Professor,
Department of Mechanical, Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180-3590
Search for other works by this author on:
Xiaoyue Liu, Mem. ASME, Mechanical Engineer,
GE Corporate Research and Development Center, 1 Research Circle, Niskayuna, NY 12309
Michael K. Jensen, Fellow ASME, Professor,
Department of Mechanical, Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180-3590
Contributed by the Heat Transfer Division for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received by the Heat Transfer Division December 15, 2000; revision received May 20, 2001. Associate Editor: R. L. Mahajan.
J. Heat Transfer. Dec 2001, 123(6): 1035-1044 (10 pages)
Published Online: May 20, 2001
Article history
Received:
December 15, 2000
Revised:
May 20, 2001
Citation
Liu, X., and Jensen, M. K. (May 20, 2001). "Geometry Effects on Turbulent Flow and Heat Transfer in Internally Finned Tubes ." ASME. J. Heat Transfer. December 2001; 123(6): 1035–1044. https://doi.org/10.1115/1.1409267
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