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TECHNICAL PAPERS

Heat Transfer in Rotating Rectangular Cooling Channels (AR=4) With Dimples

[+] Author and Article Information
Todd S. Griffith, Luai Al-Hadhrami, Je-Chin Han

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

J. Turbomach 125(3), 555-563 (Aug 27, 2003) (9 pages) doi:10.1115/1.1571850 History: Received January 18, 2002; Online August 27, 2003
Copyright © 2003 by ASME
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References

Schukin, A. V., Koslov, A. P., and Agachev, R. S., 1995, “Study and Application of Hemispherical Cavities for Surface Heat Transfer Augmentation,” ASME Paper No. 95-GT-59.
Han,  J. C., and Park,  J. S., 1988, “Developing Heat Transfer in Rectangular Channel With Rib Turbulators,” Int. J. Heat Mass Transf., 31(1), pp. 183–195.
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Wagner,  J. H., Johnson,  B. V., and Kooper,  F. C., 1991b, “Heat Transfer in Rotating Serpentine Passage With Smooth Walls,” ASME J. Turbomach., 113(3), pp. 321–330.
Parsons,  J. A., Han,  J. C., and Zhang,  Y. M., 1995, “Effects of Model Orientation and Wall Heating Condition on Local Heat Transfer in a Rotating Two-Pass Square Channel With Rib Turbulators,” Int. J. Heat Mass Transf., 38(7), pp. 1151–1159.
Johnson,  B. V., Wagner,  J. H., Steuber,  G. D., and Yeh,  F. C., 1994, “Heat Transfer in Rotating Serpentine Passage With Selected Model Orientations for Smooth or Skewed Trip Walls,” ASME J. Turbomach., 116, pp. 738–744.
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.
Willett, F. T., and Bergles, A. E., 2000, “Heat Transfer in Rotating Narrow Rectangular Ducts with Heated Sides Oriented at 60deg to the R-Z Plane,” ASME Paper No. 2000-GT-224.
Griffith,  T. S., Al-Hadhrami,  L., and J. C.,  Han, 2002, “Heat Transfer in Rotating Rectangular Cooling Channels (AR=4) With Angled Ribs,” ASME J. Heat Transfer, 124, pp. 617–625.
Ekkad,  S. V., and Han,  J. C., 1996, “Effect of Simulated TBC Spallation on Local Heat Transfer Coefficient Distributions Using a Transient Liquid Crystal Image Method,” AIAA J. Thermophys. Heat Transfer, 10(3), pp. 511–516.
Azad,  G. M. S., Huang,  Y., and Han,  J. C., 2000, “Jet Impingement Heat Transfer on Dimpled Surfaces Using a Transient Liquid Crystal Technique,” AIAA J. Thermophys. Heat Transfer, 14 (2), pp. 186–193.
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Figures

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Sketch illustrating orientation of a 4:1 aspect ratio channel in a gas turbine blade
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Schematic of experimental rotating test rig
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Schematic of 4:1 dimpled test
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Dimple induced secondary flow (conceptualization)
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Rotation-induced (Coriolis force) vortices in rectangular channel
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Nusselt number ratio for stationary smooth case
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Nusselt number ratio for rotation smooth case with β=90 deg
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Nusselt number ratio for rotation smooth case with β=135 deg
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Nusselt number ratio for stationary dimpled case
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Nusselt number ratio for rotation dimpled case with β=90 deg
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Nusselt number ratio for rotation dimpled case with β=135 deg
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Streamwise averaged Nusselt number ratio for dimpled and smooth channels with β=90 deg
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Streamwise averaged Nusselt number ratio for dimpled and smooth channels with β=135 deg
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Streamwise averaged Nusselt number ratio for dimpled and ribbed channels with β=90 deg
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Streamwise averaged Nusselt number ratio for dimpled and ribbed channels with β=135 deg

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