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Thermal-Hydraulics of Water Cooled Nuclear Reactors by Francesco D'Auria

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7.7 Film pool boiling

7.7.1 Stationary film boiling

In the film boiling mode, the liquid is separated by the vapor film from the heating surface. The intensity of heat transfer is determined by convection, while at high temperature environment, by ΔT=TwTS and radiation heat transfer through the vapor film. Mechanisms of vapor detachment out of the cavity on the wall surface is related to the thickness and the vapor film flow mode (laminar wave, turbulent, mixed). Therefore, the configuration and orientation of the heating surface, and the physical properties of liquid and vapor have certain importance in the gravity field. Theoretical analysis of the film boiling is simplified as compared with the analysis of nucleate boiling, because the process ...

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