TED-AJ03-602 NUMERICAL SIMULATION OF DOUBLE DIFFUSIVE CONVECTION AND CRYSTAL GROWTH UNDER THE NORMAL AND MICRO GRAVITY CONDITIONS

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Investigation of crystal growth in solutions is closely related to effective and high quality production of medicine, food and new materials. During the process of crystal growth in solutions, double diffusive convection occurs, which is driven by buoyancy forces due to thermal and solutal gradients. Since the double diffusive convection affects the mechanism of crystal growth, it is important to investigate and to understand the mechanism of the double diffusive convection and its effect on the crystal growth. In the present study, two- and three-dimensional numerical simulations of double diffusive convection were performed to explain the mechanism of the crystal growth from sodium chlorate aqueous solution and to discuss the effect of gravity on the crystal growth. Transient double diffusion fields were calculated by a [figure] numerical simulation code with varying the gravitational conditions. Experimental works have also been carried out to validate the simulation results. Double diffusive convection and crystal growth under the normal and micro gravity conditions have experimentally observed accurately employing a real-time phase-shifting interferometer. The governing equations of the phenomena were expressed by two- or three-dimensional, time-dependent forms of the equation and solute mass equation. Initial and boundary conditions obtained in the experiments were applied in the simulation. Results of numerical simulation were compared with those by experiments. The transient convective plumes at the corner of the seed crystal were simulated, and time variations of the plumes were precisely observed. [figure]
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TED-AJ03-602 NUMERICAL SIMULATION OF DOUBLE DIFFUSIVE CONVECTION AND CRYSTAL GROWTH UNDER THE NORMAL AND MICRO GRAVITY CONDITIONS

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