Numerical simulation of the distribution of individual gas bubbles in shaped sapphire crystals

•EFG growth of large sapphire windows.•The Stepanov (EFG) simultaneous crystal growth technology.•Computer simulation of the density of individual gas bubbles in melt.•Mechanism of individual gas bubbles formation in shaped sapphire.•Reduce the number of individual gas bubbles in sapphire sheets. Th...

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Bibliographic Details
Published in:Journal of crystal growth 2017-11, Vol.478, p.180-186
Main Authors: Borodin, A.V., Borodin, V.A.
Format: Article
Language:English
Subjects:
A1. Computer simulation
A2. Edge defined fed film growth
B1. Sapphire
B3. Optics
Bubbles
Computer simulation
Crucibles
Crystallization
Crystals
Fluid flows
Gases
Heat transfer
Mathematical models
Numerical analysis
Sapphire
Studies
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Summary:•EFG growth of large sapphire windows.•The Stepanov (EFG) simultaneous crystal growth technology.•Computer simulation of the density of individual gas bubbles in melt.•Mechanism of individual gas bubbles formation in shaped sapphire.•Reduce the number of individual gas bubbles in sapphire sheets. The simulation of the effective density of individual gas bubbles in a two-phase melt, consisting of a liquid and gas bubbles, is performed using the virtual model of the thermal unit. Based on the studies, for the first time the theoretically and experimentally grounded mechanism of individual gas bubbles formation in shaped sapphire is proposed. It is shown that the change of the melt flow pattern in crucible affects greatly the bubble density at the crystallization front, and in the crystal. The obtained results allowed reducing the number of individual gas bubbles in sapphire sheets.
ISSN:0022-0248
1873-5002
DOI:10.1016/j.jcrysgro.2017.08.028