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TECHNICAL PAPERS: Microscale Heat Transfer

The Onset of Flow Instability in Uniformly Heated Horizontal Microchannels

[+] Author and Article Information
J. E. Kennedy, G. M. Roach, M. F. Dowling, S. I. Abdel-Khalik, S. M. Ghiaasiaan, S. M. Jeter

G. W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0405

Z. H. Quershi

Westinghouse Savannah River Company, Aiken, SC 29802

J. Heat Transfer 122(1), 118-125 (Aug 03, 1999) (8 pages) doi:10.1115/1.521442 History: Received December 01, 1998; Revised August 03, 1999
Copyright © 2000 by ASME
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References

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Ishii, M., 1976, “Study of Flow Instabilities in Two-Phase Mixtures,” Argonne National Laboratory Report, ANL-76-23.
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Yadigaroglu, G., 1981, “Two-Phase Flow Instabilities and Propagation Phenomena,” Thermohydraulics of Two-Phase Systems for Individual Design and Nuclear Engineering, M. Delhaye, M. Giot, and L. M. Riethmuller, eds., Hemisphere, Washington, DC, pp. 353–403.
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Staub,  F. W., 1975, “The Void Fraction in Subcooled Boiling: Prediction of the Initial Point of Net Vapor Generation,” Int. J. Heat Mass Transf., 8, pp. 1095–1099.
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Triplett,  K. A., Ghiaasiaan,  S. M., Abdel-Khalik,  S. I., and Sadowski,  D. L., 1999, “Gas-Liquid Two-Phase Flow in Microchannels, Part I: Two-Phase Flow Patterns,” Int. J. Multiphase Flow, 25, pp. 377–394.
Triplett,  K. A., Ghiaasiaan,  S. M., Abdel-Khalik,  S. I., LeMouel,  A., and McCord,  B. N., 1999, “Gas-Liquid Two-Phase Flow in Microchannels, Part II: Void Fraction and Pressure Drop,” Int. J. Multiphase Flow, 25, pp. 395–410.
Vandervort, C. L., Bergles, A. E., and Jensen, M. K., 1992, “Heat Transfer Mechanisms in Very High Heat Flux Boiling,” Fundamentals of Subcooled Flow Boiling, ASME, New York, pp. 1–9.
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Figures

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Schematic of the test facility
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Cut-away of a test section
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Experimental demand curves for the 1.17-mm diameter test section (PE=10.34 bar)
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Comparison between the onset of nucleate boiling (ONB) data and the correlation of Bergles and Rohsenow 5(D=1.17 mm)
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Comparison between the onset of nucleate boiling (ONB) data and the correlation of Bergles and Rohsenow 5(D=1.45 mm)
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Variation of experimental values of the Stanton number at onset of flow instability (OFI) with the Peclet number and comparison with the correlation of Saha and Zuber 6 for the onset of significant void (OSV)
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Comparison between the heat flux values at the onset of flow instability (OFI) and 90 percent of the values required for bulk exit saturation

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