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• W2064757575 abstract "Abstract A model is presented that describes the time-dependent diffusion of heat and solute in an axisymmetric system undergoing directional solidification. The solution procedure involves a coupled asymptotic/numerical approach. The asymptotic expansions are based upon the assumptions that both the crucible aspect ratio and the heat exchange between the crucible and the sample are small. Further, the scalings for the Lewis and Stefan numbers are chosen to achieve a well-mixed melt. The presence of small parameters in the system leads to the development of a boundary layer near the solidifying front. The interface shape, and the thermal and solutal profiles are analytically evaluated as functions of time for various heater temperature profiles, heater translation rates, and material properties of the system. Due to the inclusion of curvature effects on the melting point, the shape of the interface is described by a superposition of a Bessel function onto a parabolic profile. The parabolic profile is set by a combination of axial and radial diffusive transport of heat while its Bessel function correction is determined by a prescribed contact angle between the interface and the crucible wall. The model predicts an oscillatory interfacial pattern in the case of undercooling thus signifying an onset of a morphological instability." @default.
• W2064757575 created "2016-06-24" @default.
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• W2064757575 date "2005-12-01" @default.
• W2064757575 modified "2023-10-17" @default.
• W2064757575 title "Asymptotic solutions for a time-dependent, axisymmetric directional solidification system" @default.
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• W2064757575 doi "https://doi.org/10.1016/j.jcrysgro.2005.08.032" @default.
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