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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
Heptadecane and Gallium Crystallization in Hydrodynamic Czochralski Model
Author(s)
Vladimir Berdnikov1, Anatoly Prostomolotov2*, Nataliya Verezub2 and Victor Vinokurov1
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DOI:10.17265/2161-6213/2015.9-10.004
Affiliation(s)
1. Institute of Thermophysics, Siberian Branch of Russian Academy of Sciences, Novosibirsk 630090, Russia
2. Institute for Problems in Mechanics, Russian Academy of Sciences, Moscow 119526, Russia
ABSTRACT
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.
KEYWORDS
Czochralski model, crystallization, fluid flows, heat transfer.
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