Stagnation-Point Free-Convection Film Boiling on a Hemisphere.

by Joseph J. Sheppard, W. S. Bradfield

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Quasi-steady, approximate solutions are developed for stagnation-point free-convection film boiling on a hemisphere at atmospheric pressure, for the limiting cases of inertial dominance and viscous dominance. These solutions indicate that the phenomenon is dominated by viscous effects for a wide range of the film-boiling parameter beta = Re Pr and for engineering fluids with widely differing properties, such as Freon-11 and water. For such fluids with vapor Prandtl numbers near unity, the range of engineering interest in stable film boiling is typified by 0.2 less than or equal to beta less than or equal to 1.0 and Re less than or equal to 1. The assumption of viscous dominance is good in this range. The quasi-steady assumption is also valid over the above range of beta and Re if, in addition, the Strouhal number St is less than or equal to 0.3 and the Fourier number Fo is less than or equal to 0.3. 34 pp. Ref. (KB)

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