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RESEARCH PAPER

Influence of Entrance Geometry on Heat Transfer in Rotating Rectangular Cooling Channels (AR=4:1) With Angled Ribs

[+] Author and Article Information
Lesley M. Wright, Wen-Lung Fu, Je-Chin Han

Turbine Heat Transfer Laboratory, Department of Mechanical Engineering, Texas A&M University, College Station, TX 77843-3123

J. Heat Transfer 127(4), 378-387 (Mar 30, 2005) (10 pages) doi:10.1115/1.1860564 History: Received October 27, 2003; Revised March 24, 2004; Online March 30, 2005
Copyright © 2005 by ASME
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References

Han, J. C., Dutta, S., and Ekkad, S. V., 2000, Gas Turbine Heat Transfer and Cooling Technology, Taylor and Francis, New York.
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Dutta,  S., and Han,  J. C., 1996, “Local Heat Transfer in Rotating Smooth and Ribbed Two-Pass Square Channels With Three Channel Orientations,” ASME J. Heat Transfer, 118, pp. 578–584.
Taslim,  M. E., Rahman,  A., and Spring,  S. D., 1991a, “An Experimental Investigation of Heat Transfer Coefficients in a Span-Wise Rotating Channel With Two Opposite Rib-Roughened Walls,” ASME J. Turbomach., 113, pp. 75–82.
Taslim,  M. E., Bondi,  L. A., and Kercher,  D. M., 1991b, “An Experimental Investigation of Heat Transfer in an Orthogonally Rotating Channel Roughened With 45° Criss-Cross Ribs on Two Opposite Walls,” ASME J. Turbomach., 113, pp. 346–353.
Azad,  G. S., Uddin,  M. J., Han,  J. C., Moon,  H. K., and Glezer,  B., 2002, “Heat Transfer in a Two-Pass Rectangular Rotating Channel With 45° Angled Rib Turbulators,” ASME J. Turbomach., 124, pp. 251–259.
Al-Qahtani,  M., Jang,  Y. J., Chen,  H. C., and Han,  J. C., 2002, “Prediction of Flow and Heat Transfer in Rotating Two-Pass Rectangular Channels With 45° Rib Turbulators,” ASME J. Turbomach., 124, pp. 242–250.
Griffith,  T. S., Al-Hadhrami,  L., and Han,  J. C., 2002, “Heat Transfer in Rotating Rectangular Channels (AR=4) With Angled Ribs,” ASME J. Heat Transfer, 124, pp. 617–625.
Lee, E., Wright, L. M., and Han, J. C., 2003, “Heat Transfer in Rotating Rectangular Channels (AR=4:1) With V-Shaped and Angled Rib Turbulators With and Without Gaps,” ASME Paper No. 2003-GT-38900.
Kays, W. M., and Crawford, M. E., 1993, Convective Heat and Mass Transfer, 3rd ed., McGraw-Hill, New York, pp. 345–348.
Boelter, L. M. K., Young, G., and Iverson, H. W., 1948, “An Investigation on Aircraft Heaters—Distribution of Heat Transfer Rate in the Entrance Section of a Circular Tube,” NACA Technical Note No. 1451.
Burggraf, F., 1970, “Experimental Heat Transfer and Pressure Drop With Two-Dimensional Turbulence Promoter Applied to Two Opposite Walls of a Square Duct,” in Augmentation of Convective Heat and Mass Transfer, edited by A. E. Bergles and R. L. Webb, ASME, New York, pp. 70–79.
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Figures

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Schematic of the heated portion of the 4:1 test section
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Cross-sectional view of the various entrance configurations
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Flow conceptualization: (a) secondary flow induced by 45° angled ribs; and (b) vortices induced by rotation in a narrow, rectangular channel
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Nusselt number ratios in smooth channels with Re=10,000
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Orientation of a narrow rectangular channel in a gas turbine blade
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Nusselt number ratio comparison of smooth channels with varied entrances
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Nusselt number ratios in angled rib channels with Re=10,000
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Channel-averaged nusselt number ratio for stationary cases
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Streamwise-averaged Nusselt number ratios in smooth channels
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Streamwise-averaged Nusselt number ratios in angled rib channels
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Channel-averaged Nusselt number ratios in rotating and stationary channels with varying entrances

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