Transient natural convection in a single-phase heat-generating pool bounded from below by a segment of a sphere

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Abstract

Transient natural convection in a heat-generating layer of water bounded from below by a segment of a sphere has been experimentally investigated as a model of a possible core-melt configuration. The layer has an insulated lower boundary and a rigid, isothermal upper boundary. These thermal and hydrodynamic boundary conditions have been chosen to provide lower-bound and limiting-case estimates of heat transfer coefficients and temperature profiles within the layer. The data comprise measured maximum temperature differences and temperature profiles within the layer as a function of time. Although the transient temperature profiles exhibit features similar to those of transient convection in a horizontal layer, flow development time-scales are found to be generally greater than for the horizontal layer. A simple relation between the layer Fourier number and Rayleigh number is found to correlate the time-scale data sufficiently well for engineering purposes.

Original languageEnglish (US)
Pages (from-to)267-278
Number of pages12
JournalNuclear Engineering and Design
Volume54
Issue number2
DOIs
StatePublished - Oct 1979
Externally publishedYes

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