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Coarsening in Solid-liquid Mixtures: Overview of Experiments on Shuttle and ISSThe microgravity environment on the Shuttle and the International Space Station (ISS) provides the ideal condition to perform experiments on Coarsening in Solid-Liquid Mixtures (CSLM) as deleterious effects such as particle sedimentation and buoyancy-induced convection are suppressed. For an ideal system such as Lead-Tin in which all the thermophysical properties are known, the initial condition in microgravity of randomly dispersed particles with local clustering of solid Tin in eutectic liquid Lead-Tin matrix, permitted kinetic studies of competitive particle growth for a range of volume fractions. Verification that the quenching phase of the experiment had negligible effect of the spatial distribution of particles is shown through the computational solution of the dynamical equations of motion, thus insuring quench-free effects from the coarsened microstructure measurements. The low volume fraction experiments conducted on the Shuttle showed agreement with transient Ostwald ripening theory, and the steady-state requirement of LSW theory was not achieved. More recent experiments conducted on ISS with higher volume fractions have achieved steady-state condition and show that the kinetics follows the classical diffusion limited particle coarsening prediction and the measured 3D particle size distribution becomes broader as predicted from theory.
Document ID
20140009204
Document Type
Conference Paper
Authors
Duval, Walter M. B.
(NASA Glenn Research Center Cleveland, OH United States)
Hawersaat, Robert W.
(NASA Glenn Research Center Cleveland, OH United States)
Lorik, T.
(ZIN Technologies, Inc. Cleveland, OH, United States)
Thompson, J.
(Northwestern Univ. Evanston, IL, United States)
Gulsoy, B.
(Northwestern Univ. Evanston, IL, United States)
Voorhees, P. W.
(Northwestern Univ. Evanston, IL, United States)
Date Acquired
July 16, 2014
Publication Date
October 27, 2013
Subject Category
Chemistry And Materials (General)
Space Sciences (General)
Physics (General)
Report/Patent Number
GRC-E-DAA-TN10459
Meeting Information
Materials Science & Technology 2013 Conference & Exhibition(Montreal, Quebec Canada)
Funding Number(s)
CONTRACT_GRANT: NNC09BA02B
CONTRACT_GRANT: NNX10AV36G
WBS: WBS 095240.04.03.03.01.03
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
Ostwald ripening
kinetics
microgravity

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