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TECHNICAL PAPERS: Forced Convection

Effects of Rib Arrangements on Heat Transfer and Flow Behavior in a Rectangular Rib-Roughened Passage: Application to Cooling of Gas Turbine Blade Trailing Edge

[+] Author and Article Information
Robert Kiml, Sadanari Mochizuki, Akira Murata

Tokyo University of Agriculture and Technology, Department of Mechanical Systems Engineering, Nakacho 2-24-16, Koganei-shi, Tokyo 184-8588, Japan

J. Heat Transfer 123(4), 675-681 (Aug 27, 1999) (7 pages) doi:10.1115/1.1378019 History: Accepted August 27, 1999; Revised January 08, 2001
Copyright © 2001 by ASME
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References

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Rau, G., Cakan, M., Moeller, D., and Arts, T., 1996, “The Effect of Periodic Ribs on the Local Aerodynamic and Heat Transfer Performance of a Straight Cooling Passage,” Proceedings, International Gas Turbine and Aeroengine Congress and Exhibition, Birmingham, UK, June 10–13, 1996.
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Kiml,  R., Mochizuki,  S., and Murata,  A., 2000, “Influence of the Gap Size between Side Walls and Ribs on the Heat Transfer in a Stationary and Rotating Straight Rib-Roughened Duct,” Int. J. Rotating Mach. 6, No. 4, pp. 253–263.
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Figures

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Schematic of internal and external cooling structures of a gas turbine rotor blade
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Schematic of rib-roughened passage in which heat transfer experiment was performed
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Thermocouple layout and rib patterns tested in present study
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Schematic of flow visualization test section
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Effect of rib configuration on average Nusselt number on all four walls
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Effects of rib configuration on friction coefficient, Cf: (a) flow pattern at x=0.66e (near the bottom wall); (b) flow pattern at x=5e (channel center); (c) flow pattern at x=9.33e (near the top wall); (d) flow pattern at y=0.33e (close to the right wall); and (e) flow pattern at y=2.5e from right wall (channel central vertical plane).
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Flow visualization results for 45 deg ribs, Re =20,000
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Schematic of secondary flow induced by 45 deg ribs
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Local Nu distribution on top wall for 45 deg ribs
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Local Nu distribution on bottom wall for 45 deg ribs
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Local Nu distribution on left wall for 45 deg ribs
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Local Nu distribution on left wall for 60 deg ribs
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Flow pattern taken for 60 deg ribs at y=2.5e (central vertical plane). Comparison of secondary flow angle between 45 deg and 60 deg ribs.

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