Abstract
The phenomenon of natural convection between two enclosures communicating through small openings like windows, ducts, and cracks has important applications in the fields of energy conservation in buildings, indoor air quality, fire research, solar energy storage, and nuclear reactor core performance. A numerical solution of natural convection between two reservoirs connected by a two-dimensional horizontal duct was obtained using a modified SIMPLE algorithm. The emphasis of the numerical computation was on high Rayleigh numbers and small duct dimensions. A strong fluid stratification in both reservoirs was observed at high Rayleigh number. The volume exchange of fluid between the reservoirs takes place through counterflow streams in the connecting duct. The exchange of diffusive energy between the two streams is substantial at low Rayleigh number and small duct dimension. Correlation equations were derived for the Nusselt number and volume exchange rate. 23 refs., 5 figs.
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