Heat Transfer and Friction Factors for Flows Inside Circular Tubes With Concavity Surfaces

[+] Author and Article Information
Ronald S. Bunker

General Electric Research Center, One Research Circle, ES-119, Niskayuna, NY 12309

Katherine F. Donnellan

General Electric Power Systems, Schenectady, NY 12345

J. Turbomach 125(4), 665-672 (Dec 01, 2003) (8 pages) doi:10.1115/1.1622713 History: Received December 01, 2002; Revised March 01, 2003; Online December 01, 2003
Copyright © 2003 by ASME
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Sample test channel with machined concavities
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Cross-sectional tube definitions
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Test facility and instrumentation
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Tube construction with heater
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Example of liquid crystal display on test section
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Example of tube axial Nusselt number variation
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Nusselt number correlations for all tests
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Normalized Nusselt number all tests
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Heat transfer enhancement with density f
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General expression for Nu (Re, f )
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Fanning friction factors
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Normalized friction factors
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Performance of concavity tubes




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