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The processes of convective heat transfer and crystallization were studied on basis of the simplified, but a unified calculation-experimental Czochralski model, using two materials with the melting temperature close to ambient room temperature: 1) heptadecane with a low thermal conductivity; 2) gallium with the high one. The transparency of heptadecane melt has permitted to visualize both the melt stream structures and geometry of its crystallized mass in the laboratory experiment and to provide data for verification of the corresponding calculation model. Numerical calculations have allowed to parametrically study the flow structure, heat fluxes on the cooled disk and to assess dependence of the melt-crystal interface for both these substances on the modes of convective heat exchange: thermal-gravitational and mixed (i.e., with an additional crystal rotation) convection.

Heptadecane and Gallium Crystallization in Hydrodynamic Czochralski Model