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TECHNICAL PAPERS: Heat Transfer Enhancement

Influence of Crossflow-Induced Swirl and Impingement on Heat Transfer in an Internal Coolant Passage of a Turbine Airfoil

[+] Author and Article Information
S. V. Ekkad, G. Pamula, S. Acharya

Mechanical Engineering Department, Louisiana State University, Baton Rouge, LA 70803

J. Heat Transfer 122(3), 587-597 (Apr 12, 2000) (11 pages) doi:10.1115/1.1289020 History: Received August 04, 1999; Revised April 12, 2000
Copyright © 2000 by ASME
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References

Boyle, R. J., 1984, “Heat Transfer in Serpentine Passages with Turbulence Promoters,” ASME Paper No. 84-HT-24.
Metzger,  D. E., and Sahm,  M. K., 1986, “Heat Transfer Around Sharp 180° Turns in Smooth Rectangular Channels,” ASME J. Heat Transfer, 108, pp. 500–506.
Abuaf, N., Gibbs, R., and Baum, R., 1986, “Pressure Drop and Heat Transfer Coefficient Distributions in Serpentine Passages With and Without Turbulence Promoters,” Proceedings 8th International Heat Transfer Conference, ASME, New York, pp. 2837–2845.
Fan, C. S., and Metzger, D. E., 1987, “Effect of Channel Aspect Ratio on Heat Transfer in Rectangular Passage Sharp 180-deg Turns,” ASME Paper 87-GT-113.
Chyu,  M. K., 1991, “Regional Heat Transfer in Two-Pass and Three-Pass Passages with 180-deg Sharp Turns,” ASME J. Heat Transfer, 113, pp. 63–70.
Ekkad,  S. V., and Han,  J. C., 1995, “Local Heat Transfer Distributions Near a Sharp 180 deg Turn of a Two-Pass Square Channel Using a Transient Liquid Crystal Image Technique,” J. Flow Visual. Image Process.,2, No. 3, pp. 287–298.
Hibbs, R., Acharya, S., Chen, Y., and Nikitopoulos, D., 1996, “Heat/Mass Transfer in a Two-Pass Rotating Smooth and Ribbed Channel,” ASME National Heat Transfer Conference, Houston, Aug.
Han,  J. C., Chandra,  P. R., and Lau,  S. C., 1988, “Local Heat/Mass Transfer Distributions Around Sharp 180 deg Turns in Two-Pass Smooth and Rib-Roughened Channels,” ASME J. Heat Transfer, 110, pp. 91–98.
Chandra,  P. R., Han,  J. C., and Lau,  S. C., 1988, “Effect of Rib Angle on Local Heat/Mass Transfer Distribution in a Two-Pass Rib-Roughened Channel,” ASME J. Turbomach., 110, pp. 70–79.
Ekkad,  S. V., and Han,  J. C., 1997, “Detailed Heat Transfer Distributions in Two-Pass Square Channels With Rib Turbulators,” Int. J. Heat Mass Transf., 40, No. 11, pp. 2525–2537.
Hibbs,  R., Acharya,  S., Chen,  Y., Nikitopoulos,  D., and Myrum,  T., 1998, “Heat Transfer in a Two-Pass Internally Ribbed Turbine Blade Coolant Channel With Cylindrical Vortex Generators,” ASME J. Turbomach., 120, No. 4, pp. 724–734.
Glezer, B., Moon, H. K., and O’Connell, T., 1996, “A Novel Technique for the Internal Blade Cooling,” ASME Paper 96-GT-181.
Ligrani, P. M., Hedlund, C. R., Thambu, R., Babinchak, B. T., Moon, H. K., and Glezer, B., 1997, “Flow Phenomena in Swirl Chambers,” ASME Paper 97-GT-530.
Moon, H. K., O’Connell, T., and Glezer, B., 1998, “Heat Transfer Enhancement in a Circular Channel Using Lengthwise Continuous Tangential Injection,” International Heat Transfer Conference, Seoul, South Korea.
Hedlund, C. R., Ligrani, P. M., Moon, H. K., and Glezer, B., 1998, “Heat Transfer and Flow Phenomena in a Swirl Chamber Simulating Turbine Blade Internal Cooling,” ASME Paper 98-GT-466.
Metzger,  D. E., and Larson,  D. E., 1986, “Use of Melting Point Surface Coatings for Local Convection Heat Transfer Measurements in Rectangular Channel Flows With 90-deg Turns,” ASME J. Heat Transfer, 108, pp. 48–54.
Kline,  S. J., and McClintock,  F. A., 1953, “Describing Uncertainties in Single Sample Experiments,” Mech. Eng. (Am. Soc. Mech. Eng.), 75, No. 1, pp. 3–8.
Gee,  D. L., and Webb,  R. L., 1980, “Forced Convection Heat Transfer in Helically Rib-Roughened Tubes,” Int. J. Heat Mass Transf., 23, pp. 1127–1136.

Figures

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Illustration of channels with (a) 180 deg turn (b) holes
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Experimental test setup
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Three test channel configurations; (a) Case 2, (b) Case 3, (c) Case 4
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Smoke flow visualization results for (a) Case 2, (b) Case 3, (c) Case 4
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Detailed heat transfer distributions for all channels at Re=25,000
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Spanwise averaged Nusselt number distributions on both walls compared to a two-pass with turn for Re=25,000
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Effect of flow Reynolds number for each case on Wall 1
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Effect of flow Reynolds number for each case on Wall 2
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Effect of flow configuration (case) on Wall 1 for each Reynolds number
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Effect of flow configuration (case) on Wall 2 for each Reynolds number
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Comparison of present data to published Nusselt number ratios for the overall averaged rib turbulated second pass
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Overall averaged Nusselt number ratio versus friction factor ratio for all four cases
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Overall thermal performance parameter compared to Reynolds number for each case

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