Thermoelectric Magnetohydrodynamic Flows During Various Crystal Growth Processes With an Externally Applied Magnetic Field
Khine, Yu Yu
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https://hdl.handle.net/2142/83992
Description
Title
Thermoelectric Magnetohydrodynamic Flows During Various Crystal Growth Processes With an Externally Applied Magnetic Field
Author(s)
Khine, Yu Yu
Issue Date
1999
Doctoral Committee Chair(s)
Walker, J.S.
Department of Study
Mechanical Engineering
Discipline
Mechanical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Chemical
Language
eng
Abstract
All the models involve a radially outward flow near the crystal-melt interface which helps produce uniform and homogeneous crystals. Numerical results are presented for Bridgman and float zone processes with strong fields. The azimuthal motion dominates the melt motion. As the magnetic field strength is increased from zero to large values, the azimuthal and meridional motions first increase from zero to maxima and then decay back toward zero for very strong magnetic fields. Numerical results for traveling heater method are presented for arbitrary strength magnetic fields. The flow is inertialess at the beginning and the convective effects emerge as the Reynolds number Re is increased for a particular case. For relatively weak magnetic field strength, the convective effects dominate the EM damping effects for very large Re. For weak magnetic field case, the convective effects emerge as thermoelectric body force is increased, and they dominate the melt motion for strong body force. A similarity problem is considered to understand the insights for weak magnetic field case. The solutions reflect the numerical results for weak field cases. While strong magnetic field results are useful for terrestrial crystal growth processes, the arbitrary strength field and weak field results will be useful for future crystal growth experiments in space.
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