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TECHNICAL PAPERS: Evaporation, Boiling, and Condensation

Onset of Nucleate Boiling and Active Nucleation Site Density During Subcooled Flow Boiling

[+] Author and Article Information
Nilanjana Basu, Gopinath R. Warrier, Vijay K. Dhir

Mechanical and Aerospace Engineering Department, University of California, Los Angeles, Los Angeles, CA 90095-1597

J. Heat Transfer 124(4), 717-728 (Jul 16, 2002) (12 pages) doi:10.1115/1.1471522 History: Received October 09, 2001; Revised February 01, 2002; Online July 16, 2002
Copyright © 2002 by ASME
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References

Warrier, G. R., and Dhir, V. K., 1999, “Review of Experimental and Analytical Studies on Low Pressure Subcooled Flow Boiling,” Proceedings of the 5th ASME/JSME Joint Thermal Engineering Conference, Paper AJTE99-6233, CD-ROM Edition.
Hsu,  Y. Y., 1962, “On the Size Range of Active Nucleation Cavities on a Heating Surface,” ASME J. Heat Transfer, 84, pp. 207–216.
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Kandlikar, S. G., Mizo, V., Cartwright, M., and Ikenze, E., 1997, “Bubble Nucleation and Growth Characteristics in Subcooled Flow Boiling of Water,” National Heat Transfer Conference, ASME, HTD-342, pp. 11–18.
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Chin, Y., 1997, “An Experimental Study of Flow Boiling in a Narrow Channel: From Convection to Nucleate Boiling,” Ph.D. thesis, University of Houston, Houston, TX.
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Wang,  C. H., and Dhir,  V. K., 1993, “Effect of Surface Wettability on Active Nucleation Site Density During Pool Boiling of Water on a Vertical Surface,” ASME J. Heat Transfer, 115, pp. 659–669.
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Figures

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Cross section of the test chamber for flat plate
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Copper heating block and thermocouple placement
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Photograph of the test chamber for flat plate test surface
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Cross section of the test surface for nine-rod bundle
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Arrangement of thermocouples at a given axial plane
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Heat transfer coefficient as a function of axial distance for different heat fluxes for mass flux=346 kg/m2 s and inlet liquid subcooling=26.5°C
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Variation of ONB location with ΔTw,ONB for various flow rates and contact angles
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Comparison of predicted and experimental Tw,ONB values
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Comparison of predicted and experimental qw,ONB values
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Inception superheat variation with contact angle for water
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Comparison of Na for two different mass fluxes
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Comparison of Na for different liquid subcooling
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Active nucleation site density data
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Comparison of heater surface during nucleate boiling, (a) ϕs=30 deg and (b) ϕs=90 deg
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Comparison of predicted and experimental Na values

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