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Studies of Model Immiscible SystemsThe objectives are to use model transparent monotectics to obtain fundamental information applicable to two-phase systems in general, to apply this understanding to materials of interest in the Microgravity Science and Applications program, and to interpret results of flight experimental involving monotectic alloys. A number of model immiscible systems are in use to study various aspects of two-phase behavior within the miscibility gap and during solidification. Particle growth, coalescence and particle motions are under investigation using a holographic microscopy system. The system is capable of working with particle densities up to 10 to the 7th power particles/cubic centimeters through a 100 micron depth and can resolve particles of the order of 2 to 3 micron in diameter throughout the entire cell volume. Particle size, distribution changes with respect to time and temperature are observable from sequential holograms. Initial experiments using diethylene glycol/ethyl salicylate (DEG/ES) have demonstrated the usefulness of the technique. The thermal system controls temperature to at least plus or minus 0.001 K over the course of an experiment. A time-lapse film, made from holograms, of a succinonitrile/water solution shows particle size and number distribution changes with time under isothermal conditions. The observations are consistent with Ostwald ripening theory.
Document ID
19860000645
Acquisition Source
Legacy CDMS
Document Type
Other
Authors
Frazier, D. O.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Facemire, B. R.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Witherow, W. K.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Fanning, U.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Kaukler, W. F.
(Universities Space Research Association United States)
Date Acquired
August 12, 2013
Publication Date
May 1, 1985
Publication Information
Publication: NASA, Washington Microgravity Sci. and Appl. Program Tasks
Subject Category
Astronautics (General)
Accession Number
86N10112
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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