Solidification Process with Free Convection in a Circular Enclosure

A numerical study of unsteady natural convection flow during freezing of pure water in a circular enclosure is presented using ANSYS. Mathematical model for solidification process is based on apparent capacity method and viscosity depended temperature formulation. The governing equations are descritized on a fixed grid. Water’s temperature is initially higher than its freezing temperature (To=21oC). Then, the temperature of the enclosure’s boundary is dropped to –10oC. Ice forms at the enclosure boundary while natural convection flow is induced in the liquid region. Calculations have been made for the rate of change of solid fraction and flow field, and density inversion near freezing temperature phenomenon of water is considered. The results are validated with previously published experimental data, and a good agreement was found.

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