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FLOW AROUND A SPHERICAL NODULE DURING ITS CRYSTALLIZATION

A numerical study is developed to predict the behavior of a spherical nodule immersed in a cold fluid during its crystallization. The studied flow occurs in a cold storage tank. The nodule was initially undercooled. This study consists of: i) an axisymmetric simulation of mixed convection around the nodule and ii) a concentric modeling of phase change inside the nodule using a quasi-stationary model. These two calculations are coupled with their respective boundary conditions. Different velocities of external fluid and different temperatures of crystallization are studied. The results show that the heat exchange and the kinetics of crystallization are mainly influenced by the natural convection even if the resulting flow patterns depend on the direction of the forced flow.