Effects of anisotropy and solid/liquid thermal conductivity ratio on flow instabilities during inverted Bridgman growth

The effects of a range of solid/liquid conductivity ratios on convection and flow during solidification of pure gallium in an inverted Bridgman apparatus have been investigated. A variety of steady and unsteady flow patterns, both symmetric and asymmetric, were observed and compared to available spe...

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Bibliographic Details
Published in:International journal of heat and mass transfer 2004-07, Vol.47 (14), p.3403-3413
Main Authors: Kaenton, J., Semma, E., Timchenko, V., El Ganaoui, M., Leonardi, E., de Vahl Davis, G.
Format: Article
Language:English
Subjects:
Anisotropic conduction
Cross-disciplinary physics: materials science
rheology
Directional solidification
Exact sciences and technology
Flow instability
Growth from melts
zone melting and refining
Inverted Bridgman apparatus
Materials science
Methods of crystal growth
physics of crystal growth
Physics
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Summary:The effects of a range of solid/liquid conductivity ratios on convection and flow during solidification of pure gallium in an inverted Bridgman apparatus have been investigated. A variety of steady and unsteady flow patterns, both symmetric and asymmetric, were observed and compared to available spectral results. Transition Rayleigh number values have been identified. The effects of anisotropy in thermal conductivity of gallium on the flow patterns were included. The computational method based on a fixed grid enthalpy formulation has been extended to model convection and anisotropic conduction during directional solidification.
ISSN:0017-9310
1879-2189
DOI:10.1016/j.ijheatmasstransfer.2004.01.017