Natural-convection effects during freezing of water confined inside an isotkermally cooled horizontal cylinder are experimentally investigated. From the measured ice profiles at different times for initial temperature of water T1 = 1.0−2l.7°C, the locally transient heat transfer coefficients at the ice-water interface art obtained by using a series solution of the Laplace equation in the ice. Because of the well-known density inversion effect of water in the proximity of the freezing point of water, the natural-convection flow for the solidification processes becomes significant. Depending on the initial water temperature, quite different shapes of the ice layer, the flow pattern, and the locally transient heat transfer coefficient are presented and discussed. A flow direction inversion region exists in the range ofT1 = 4.0−8.0°C, and a minimum time-average Nusselt number occurs near T1 =6.0°C A correlation for the mean Nusselt number is also obtained for a wide range of modified Grashof numbers.
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Chen et al. (1992) studied this question.
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