Abstract
The effects of the inner cylinder diameter and the initial temperature of a stably stratified fluid were experimentally investigated on free convection heat transfer between coaxial cylinders. The stratified layer was formed using a sucrose aqueous solution, and was heated from the outer cylinder (70mm I.D.) at constant heat flux and cooled from the inner cylinder (50.8mm or 15mm O.D.) at constant temperature. The experiment was conducted for the initial temperature of the fluid T_0 equal to or greater than the surface temperature of the inner cylinder T_c. As a result it has been found that the initial temperature of the fluid affects the heat transfer and growth of the convection layers in the early stage of heating. As for the effects of the inner cylinder diameter, the onset of the free convection occurs earlier and thereby the heat transfer is affected with increasing the diameter of the inner cylinder, because of a decrease of the distance between the heating and cooling surfaces.
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