The present research is an experimental study of pool boiling nucleation behavior using flat, smooth surfaces immersed in saturated highly wetting liquids, FC-72 and FC-87. A flush-mounted, copper surface of 10 mm × 10 mm is used as a heat transfer surface, simulating a microelectronic chip surface. At the nucleation incipient points of higher wall superheats with steady increase of heat flux, vapor film blankets the smooth surface and remains on the surface. To predict this film boiling incipience phenomenon from the smooth surface, an incipience map is developed over the boiling curve. When the incipient heat flux is higher than the minimum heat flux (MHF) and the incipient wall superheat value is higher than the transition boiling curve value at the incipient heat flux, the transition from single-phase natural convection to film boiling is observed at the incipient point. To prevent film boiling incipience, a microporous coating is applied over the smooth surface, which decreases incipient wall superheat and increases minimum heat flux. The film boiling incipience should be avoided to take advantage of highly efficient nucleate boiling heat transfer for the cooling of high-heat-flux applications.
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Film Boiling Incipience at the Departure From Natural Convection on Flat, Smooth Surfaces
J. Y. Chang,
J. Y. Chang
Department of Mechanical and Aerospace Engineering, The University of Texas at Arlington, Arlington, TX 76019-0023
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S. M. You,
S. M. You
Department of Mechanical and Aerospace Engineering, The University of Texas at Arlington, Arlington, TX 76019-0023
e-mail: you@uta.edu
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A. Haji-Sheikh
A. Haji-Sheikh
Department of Mechanical and Aerospace Engineering, The University of Texas at Arlington, Arlington, TX 76019-0023
Search for other works by this author on:
J. Y. Chang
Department of Mechanical and Aerospace Engineering, The University of Texas at Arlington, Arlington, TX 76019-0023
S. M. You
Department of Mechanical and Aerospace Engineering, The University of Texas at Arlington, Arlington, TX 76019-0023
e-mail: you@uta.edu
A. Haji-Sheikh
Department of Mechanical and Aerospace Engineering, The University of Texas at Arlington, Arlington, TX 76019-0023
J. Heat Transfer. May 1998, 120(2): 402-409 (8 pages)
Published Online: May 1, 1998
Article history
Received:
July 30, 1996
Revised:
January 30, 1997
Online:
December 5, 2007
Citation
Chang, J. Y., You, S. M., and Haji-Sheikh, A. (May 1, 1998). "Film Boiling Incipience at the Departure From Natural Convection on Flat, Smooth Surfaces." ASME. J. Heat Transfer. May 1998; 120(2): 402–409. https://doi.org/10.1115/1.2824264
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