Abstract
An experimental investigation is described concerning the natural convection flow patterns which occur in the annular space between two concentric isothermal spheres, the inner one being hotter. The diameter ratios ranged from 1.09 to 2.17. The converting fluids were air and water, yielding Grashof numbers in the range of 1.7 × 10 3 to 1.5 × 10 7. The several types of flow patterns observed are correlated with previously published temperature profiles and are categorized in terms of steady and unsteady regimes.
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