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  • 1975-1979  (4)
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  • 1
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    Convective heat transfer during dendritic growth (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Axial growth rate measurements were carried out at 17 levels of supercooling between 0.043 C and 2 C, a temperature range in which convection, instead of diffusion, becomes the controlling mechanism of heat transfer in the dentritic growth process. The growth velocity, normalized to that expected for pure diffusive heat transfer, displays a dependence on orientation. The ratio of the observed growth velocity to that for convection-free growth and the coefficients of supercooling are formulated. The dependence of normalized growth rate in supercooling is described for downward growing dendrites. These experimental correlations can be justified theoretically only to a limited extent.
    Keywords: SOLID-STATE PHYSICS
    Type: ESA Mater. Sci. in Space; p 309-312
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Convective flow during dendritic growth (1979)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A review is presented of the major experimental findings obtained from recent ground-based research conducted under the SPAR program. Measurements of dendritic growth at small supercoolings indicate that below approximately 1.5 K a transition occurs from diffusive control to convective control in succinonitrile, a model system chosen for this study. The key theoretical ideas concerning diffusive and convective heat transport during dendritic growth are discussed, and it is shown that a transition in the transport control should occur when the characteristic length for diffusion becomes larger than the characteristic length for convection. The experimental findings and the theoretical ideas discussed suggest that the Fluid Experiment System could provide appropriate experimental diagnostics for flow field visualization and quantification of the fluid dynamical effects presented here.
    Keywords: SOLID-STATE PHYSICS
    Type: Alabama Univ. UAH(NASA Workshop on Fluids Expt. System; p 170-190
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Convective heat transfer during dendritic solidification (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Experiments on succinonitrile are described in which the dependence of dendritic growth velocity is studied as a function of orientation with respect to gravity. Growth rate measurements were carried out at a relatively small supercooling, requiring high specimen purity as well as extreme thermal stability and precision temperature measurement. The normalized growth velocity showed a dependence on orientation described by the ratio of observed growth velocity to that expected for convection-free growth being equal to 3.52 times the n-th power of Cos half the orientation angle, where n lies between 0.5 and 0.75.
    Keywords: METALLIC MATERIALS
    Type: AIAA PAPER 78-220 , Aerospace Sciences Meeting; Jan 16, 1978 - Jan 18, 1978; Huntsville, AL
    Format: text
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  • 4
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    Convection and diffusion effects during dendritic solidification (1979)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: A report is presented of the first quantitative measurements of dendritic growth at supercooling levels where convection instead of diffusion is the controlling heat transfer mechanism. Precautions similar to that used in an investigation conducted by Glicksman et al. (1976) were taken to insure 'free' dendritic growth conditions. Dendritic growth velocity was measured as a function of growth orientation at seventeen supercoolings which ranged from 0.043 C to 2 C. Selected but representative measurements of velocity versus orientation angle are shown in a graph. The relative growth velocity of a downward growing dendrite is found to be greater than that of a diffusion-limited dendrite. This result is consistent with that expected from the enhanced heat transfer arising from natural convection.
    Keywords: METALLIC MATERIALS
    Type: AIAA PAPER 79-0029 , American Institute of Aeronautics and Astronautics, Aerospace Sciences Meeting; Jan 15, 1979 - Jan 17, 1979; New Orleans, LA
    Format: text
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