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Bubble behavior during solidification in low gravityThe trapping and behavior of gas bubbles were studied during low-gravity solidification of carbon tetrabromide, a transparent metal-model material. The experiment was performed during a NASA-sponsored sounding rocket flight and involved gradient freeze solidification of a gas-saturated melt. Gas bubbles were evolved at the solid-liquid interface during the low-gravity interval. No large-scale thermal migration of bubbles, bubble pushing by the solid-liquid interface, or bubble detachment from the interface were observed during the low-gravity experiment. A unique bubble motion-fluid flow event occurred in one specimen: a large bubble moved downward and caused some circulation of the melt. The gas bubbles that were trapped by the solid in commercial-purity material formed voids that had a cylindrical shape, in contrast to the spherical shape that had been observed in a prior low-gravity experiment. These shapes were not influenced by the gravity level (0.0001 g-0 vs g-0), but were dependent upon the initial temperature gradient. In higher purity material, however, the shape of the voids changed from cylindrical in 1g to spherical in low gravity.
Document ID
19790068023
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Papazian, J. M.
(Grumman Aerospace Corp. Research Dept., Bethpage, N.Y., United States)
Wilcox, W. R.
(Clarkson College of Technology Potsdam, N.Y., United States)
Gutowski, R.
(Grumman Aerospace Corp. Bethpage, NY, United States)
Date Acquired
August 9, 2013
Publication Date
October 1, 1979
Publication Information
Publication: AIAA Journal
Volume: 17
Subject Category
Chemistry And Materials (General)
Accession Number
79A52036
Funding Number(s)
CONTRACT_GRANT: NAS8-31529
Distribution Limits
Public
Copyright
Other

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