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  • 1
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    The isothermal dendritic growth experiment - A USMP-2 space flight experiment (1992)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The NASA Isothermal Dendritic Growth Experiment (IDGE), which is to be performed on three of the U.S. Microgravity Payload flights, is discussed. IDGE is designed to investigate dendritic growth under microgravity. The theory of dendritic growth and the effects of gravity on it are reviewed, and the IDGE experimental apparatus, design, and ground-based tests are discussed.
    Keywords: MATERIALS PROCESSING
    Type: AIAA PAPER 92-0350
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    NASA TECHNICAL REPORTS
  • 2
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    Scientific basis for the Isothermal Dendritic Growth Experiment - A USMP-2 space flight experiment (1991)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: NASA has planned three flight experiments, designated as the Isothermal Dendritic Growth Experiment (IDGE), to be performed on three of the United States Microgravity Payload (USMP) flights. IDGE is designed to provide microgravity data on dendritic growth for a critical test of theory. Terrestrial gravity, g sub 0, and the associated phenomenon of buoyancy driven convection, prevent a truly quantitative test of pure, diffusocapillary dendritic growth theory. However, recent theoretical analysis provides a fluid mechanics framework for estimating the effects of reduced gravity on the dendritic solidification of pure succinonitrile (SCN), the model material selected for the first IDGE flight. The results (dendritic tip radii and velocities) of the recent fully integrated ground-based tests on the IDGE prototype engineering hardware is in general agreement with the 'historical' ground based data for SCN. At undercoolings of 0.5 K or less, a microgravity environment of approximately 10 exp -3 g sub 0 or lower would have a significant difference from the g sub 0 dendritic growth of SCN.
    Keywords: MATERIALS PROCESSING
    Type: Materials Science Forum (ISSN 0255-5476); p. 51-59.
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    NASA TECHNICAL REPORTS
  • 3
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    IDGE - A test of dendritic growth theory using space flight (1993)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: The isothermal Dendritic Growth Experiment (IDGE), to be performed on three of the United States Microgravity Payload (USMP) flights, starting with USMP-2, is designed to provide microgravity data on dendritic growth for a critical test of theory. Ground based test data using succinonitrile (SCN), from both a flight growth chamber and a laboratory growth chamber, are compared to theoretical calculations of dendritic tip velocities and radii. The comparison shows that the data from the flight chamber are consistent with the historical data and that dendritic growth in a microgravity environment should exhibit significant differences from the dendritic growth of SCN at g sub 0.
    Keywords: MATERIALS PROCESSING
    Type: AIAA PAPER 93-0260 , ; 6 p.|AIAA, Aerospace Sciences Meeting and Exhibit; Jan 11, 1993 - Jan 14, 1993; Reno, NV; United States
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    NASA TECHNICAL REPORTS
  • 4
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    Isothermal Dendritic Growth Experiment - Science, engineering, and hardware development for USMP space flights (1991)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: The Isothermal Dendritic Growth Experiment (IDGE) has been designed to provide microgravity data on dendritic growth for a critical test of theory. This paper updates progress on constructing a crystal growth chamber suitable for space flight. The IDGE chamber is constructed from glass and stainless steel and is hermetically sealed by electron beam welds and glass-metal seals. Initial tests of the chambers sample's melting point plateau show that the new chamber design is capable of preserving the 99.9995 percent purity of succinonitrile. Dendrite growth can be initiated in the center of the IDGE chamber by means of thermo-electric coolers and a capillary injector tube (stinger). The new IDGE chamber is ready for fully integrated tests with the prototype IDGE engineering hardware at NASA's Lewis Research Center.
    Keywords: MATERIALS PROCESSING
    Type: Advances in Space Research (ISSN 0273-1177); 11; 7 19
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