Steady-state nucleate boiling heat transfer experiments in saturated and subcooled water were conducted. The heating surface was a 0.305 m hemispherical aluminum vessel heated from the inside with water boiling on the outside. It was found that subcooling had very little effect on the nucleate boiling curve in the high heat flux regime where latent heat transport dominated. On the other hand, a relatively large effect of subcooling was observed in the low-heat-flux regime where sensible heat transport was important. Photographic records of the boiling phenomenon and the bubble dynamics indicated that in the high-heat-flux regime, boiling in the bottom center region of the vessel was cyclic in nature with a liquid heating phase, a bubble nucleation and growth phase, a bubble coalescence phase, and a large vapor mass ejection phase. At the same heat flux level, the size of the vapor masses was found to decrease from the bottom center toward the upper edge of the vessel, which was consistent with the increase observed in the critical heat flux in the flow direction along the curved heating surface.
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Steady-State Subcooled Nucleate Boiling on a Downward-Facing Hemispherical Surface
K. H. Haddad,
K. H. Haddad
Department of Mechanical Engineering, The Pennsylvania State University, University Park, PA 16802
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F. B. Cheung
F. B. Cheung
Department of Mechanical Engineering, The Pennsylvania State University, University Park, PA 16802
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K. H. Haddad
Department of Mechanical Engineering, The Pennsylvania State University, University Park, PA 16802
F. B. Cheung
Department of Mechanical Engineering, The Pennsylvania State University, University Park, PA 16802
J. Heat Transfer. May 1998, 120(2): 365-370 (6 pages)
Published Online: May 1, 1998
Article history
Received:
August 16, 1996
Revised:
January 14, 1998
Online:
December 5, 2007
Citation
Haddad, K. H., and Cheung, F. B. (May 1, 1998). "Steady-State Subcooled Nucleate Boiling on a Downward-Facing Hemispherical Surface." ASME. J. Heat Transfer. May 1998; 120(2): 365–370. https://doi.org/10.1115/1.2824258
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