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Computational Thermal Sciences: An International Journal
ESCI SJR: 0.249 SNIP: 0.434 CiteScore™: 1.4

ISSN Imprimir: 1940-2503
ISSN En Línea: 1940-2554

Computational Thermal Sciences: An International Journal

DOI: 10.1615/ComputThermalScien.2015014392
pages 1-10

NUMERICAL PREDICTION OF THE MEAN TEMPERATURE OF THE VAPOR FILM IN FILM BOILING HEAT TRANSFER

A. Abanades
ETSII/Universidad Politécnica de Madrid, J. Gutiérrez Abascal, 2-28006 Madrid, Spain
Ruben Arevalo
Mechanical Engineering Department, UNET, San Cristobal 5001, Venezuela
L. Rebollo
ETSII/Universidad Politécnica de Madrid, J. Gutiérrez Abascal, 2-28006 Madrid, Spain

SINOPSIS

The phase change heat (hfg) plays a fundamental role in the description of the film boiling phenomena and, therefore, is included in most of the correlation to evaluate film boiling heat transfer coefficients. The Jakob number (Ja) is used to establish the ratio between hfg and the sensible heat required to heat the vapor formed from the saturation temperature of the surroundings to the temperature on the solid-fluid interface. In the most accepted correlations, the enthalpy increase in the fluid is described with a scaling factor of hfg based on a fraction of Ja. In literature, this fraction varies from 0.34 to 0.95. In this paper, a numerical prediction of the mean temperature of the vapor film and this fraction were done based on computational fluid dynamic (CFD) calculation. Our analysis of the vapor film temperature shows that this Ja fraction is of the order of 0.4, with a small dependency of the emissivity and Prandtl number.


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