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Heat transfer and fluid flow in floating-zone crystal growth with a mostly covered melt surfaceComputer simulation was conducted to study a modified floating-zone crystal growth process, in which the melt surface is mostly covered with a heated ring. The growth of 6-mm diameter single crystals of NaNO3 was considered, and the effects of the following parameters were studied: (1) temperature of the ring, (2) growth rate, (3) surface tension-temperature coefficient of the melt, (4) thermal expansion coefficient of the melt, and (5) gravity. It was demonstrated that thermocapillary convection in the melt zone is reduced significantly in this modified process. The model was checked against the measured lengths of the meniscus near the growth front and axial temperature distribution in a growing crystal, and the agreement was good.
Document ID
19920046901
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Lan, C. W.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Kou, Sindo
(Wisconsin, University Madison, United States)
Date Acquired
August 15, 2013
Publication Date
February 1, 1992
Publication Information
Publication: International Journal of Heat and Mass Transfer
Volume: 35
ISSN: 0017-9310
Subject Category
Materials Processing
Accession Number
92A29525
Funding Number(s)
CONTRACT_GRANT: NAG8-705
Distribution Limits
Public
Copyright
Other

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