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Flight 1 technical report for experiment 74-36: Thermal migration of bubbles and their interaction with solidification interfacesSpecimens of gas saturated carbon tetrabromide were directionally solidified in a transparent furnace using a gradient freeze technique. The original temperature gradient was 5 C/cm and the cooling rate was 40 C/h. Progress of the experiment was monitored photographically. Gas bubbles were generated at the advancing solidification front in each of the three specimens. The gas bubbles were observed to increase in size, coalesce, and eventually be grown into the solid specimen under low gravity conditions. No bubble detachment from the interface was observed. Identical specimens processed in the laboratory showed bubble nucleation, bubble growth, and eventual bubble detachment due to buoyancy forces. Examination of the specimens showed a significantly greater void content in the low gravity processed samples. The grain size was observed to be finer in the low gravity processed samples.
Document ID
19760016955
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Papazian, J. M. (Grumman Aerospace Corp. Bethpage, NY, United States)
Wilcox, W. R. (Clarkson Coll. of Technol.)
Date Acquired
September 3, 2013
Publication Date
April 1, 1976
Subject Category
Solid-State Physics
Report/Patent Number
NASA-CR-144304
RM-616
Accession Number
76N24043
Funding Number(s)
CONTRACT_GRANT: NAS8-31529
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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