Abstract
The effects of mixed convection within large baffled chambers for both ‘aided’ and ‘opposed’ buoyant forces are investigated. Experimental and numerical results are compared for the momentum boundary layer thickness and temperature distribution within the chamber. Two- and three-dimensional transient laminar numerical models are formulated using a fully implicit finite-difference scheme. The inlet and wall temperatures are held constant while maintaining a uniform inlet velocity. Two tiers of four (two per tier) horizontal baffles are located axisymmetrically about the vertical axis with the inlet at the top and exhaust at the base of the chamber. The difference between the inlet and wall temperatures ranges between −1.0 and 3.3°C with a Prandtl number, Pr = 0.7, inlet Reynolds number. Re = 32 and 235, and inlet Rayleigh number, Ra = 0–6.8 × 10 7. It is concluded that the flow is predominantly buoyant and asymmetric in nature. The development of the flow is sensitive to small variations in the temperature difference between the inlet and wall.
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