Cooling of Cans Filled with Water due to Internal Convection

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With glass models, cooling of cans filled with water was studied, after the method previously adopted by TANI in the study of beating of them. Mode of circulation due to convection was visualized with aluminium powder suspended in water, which showed the existence of a thin swiftly descending layer against the lateral wall of the can. Temperatures, observed at several points in the region, where water is ascending very slowly, were plotted semilogarithmically against time, and the factor f. which represents the time required for the difference in temperature between the can and cooling medium to diminish to a tenth of the value, was examined. Approximate criteria on the relation between the factar f and the size of cans, i. e. height and radius, l and a, were derived for the cases, where the can was immersed in cooling media, where the lateral surface only was exposed to the media and where top end was cooled especially. The criteria, though simple in form, were proved satisfactory to explain the experimental results.
社団法人日本水産学会の論文