Abstract
Natural convection heat transfer between concentrically located isothermal spherical, cylindrical and cubical inner bodies and their isothermal cubical enclosure was experimentally investigated. Comparisons were made with the existing data for these same inner bodies and a spherical enclosure. In addition, temperature distributions and flow visualization data were obtained for most of those geometries. Comparisons made between the spherical and cubical enclosure, for the same inner body types, showed that the cubical enclosure resulted in a larger Nusselt number for a given Rayleigh number and inner body size. Heat transfer data taken with a non-isothennal inner body showed that the isothermality conditions on the inner body could be relaxed. All of the heat transfer data was correlated with an average deviation of less than 14%. Overall, the effect of the enclosure shape was small so long as the appropriate length scale is employed.
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