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Dendritic Growth Velocities in MicrogravityWe measured dendritic tip velocities in pure succinonitrile (SCN) in microgravity. using a sequence of telemetered binary images sent to Earth from the Space Shuttle Columbia (STS-62). Growth velocities were measured as a function of the supercooling over the range 0.05-1.5 K. Microgravity observations show that buoyancy-induced convection alters the growth kinetics of SCN dendrites at supercooling as high as 1.3 K. Also, the dendrite velocity data measured under microgravity agree well with the Ivantsov paraboloidal diffusion solution when coupled to a scaling constant of sigma(sup *) = 0.0157.
Document ID
19970003809
Acquisition Source
Headquarters
Document Type
Reprint (Version printed in journal)
Authors
Glicksman, M. E.
(Rensselaer Polytechnic Inst. Troy, NY United States)
Koss, M. B.
(Rensselaer Polytechnic Inst. Troy, NY United States)
Winsa, E. A.
(NASA Lewis Research Center Cleveland, OH United States)
Date Acquired
August 17, 2013
Publication Date
July 25, 1994
Publication Information
Publication: Physical Review Letters
Publisher: American Physical Society
Volume: 73
Issue: 4
ISSN: 0031-9007
Subject Category
Materials Processing
Report/Patent Number
E-9554
NAS 1.15:112086
NASA-TM-112086
Accession Number
97N70265
Funding Number(s)
CONTRACT_GRANT: NAS3-25368
PROJECT: RTOP 656-61-23
Distribution Limits
Public
Copyright
Public Use Permitted.
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