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Solidification Dynamics of Spherical Drops in a Free Fall EnvironmentSilver drops (99.9%, 4, 5, 7, and 9 mm diameter) were levitated, melted, and released to fall through Marshall Space Flight Center's 105 meter drop tube in helium - 6% hydrogen and pure argon atmospheres. By varying a drop s initial superheat the extent of solidification prior to impact ranged from complete to none during the approx. 4.6s of free fall time. Comparison of the experimental observations is made with numerical solutions to a model of the heat transfer and solidification kinetics associated with cooling of the drop during free fall, particularly with regard to the fraction of liquid transformed. Analysis reveals the relative importance ,of the initial parameters affecting the cooling and solidification rates within the drop. A discussion of the conditions under which the actual observations deviate from the assumptions used in the model is presented.
Document ID
20060019179
Acquisition Source
Marshall Space Flight Center
Document Type
Other
Authors
Grugel, Richard N.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Brush, Lucien N.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Date Acquired
August 23, 2013
Publication Date
January 1, 2006
Subject Category
Physics (General)
Distribution Limits
Public
Copyright
Other

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