Abstract
A numerical study of the flow and heat transfer by natural convection and surface radiation in a tall partitioned cavity is performed in the present work. The left part (glazed cavity) is filled with air (Pr=0.71) while the right part is filled with water (Pr=7). The two cavities are separated by a thin, rigid partition absorbing a solar flux S ranging from 0 to 1000W/m². The right (inner) surface of the cavity is maintained at the temperature Ti=20°C, while the left one (outer) is maintained at the temperature To ranging from 0 °C to 50 °C. The horizontal surfaces are assumed to be adiabatic. Such a geometrical configuration and boundary conditions are chosen to model the flow and heat transfer in a water Trombe wall. A detailed examination of S and To effects on the flow and heat transfer in such a structure is the subject of this study. The main obtained results show that the flow structure in water and air can be similar or completely different depending on the mentioned parameters. Two values of the emissivity of the air cavity surfaces are considered ε=0 and ε=1 to study the effect of surface radiation. Two correlations giving the outer and inner heat fluxes Qo and Qi as a function of S and To are developed.
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