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  • Other Sources  (3)
  • 2020-2022
  • 1995-1999
  • 1985-1989  (3)
  • 1989  (3)
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  • 2020-2022
  • 1995-1999
  • 1985-1989  (3)
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  • 1
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    Flow-induced morphological instabilities due to temporally-modulated stagnation-point flow (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The influence of periodically-modulated planar stagnation-point flow on the morphological stability of a directionally-solidifying interface is presently considered with a view to the effect of unsteady nonparallel flows on single-crystal growth. The modeling of the system assumes that the viscous boundary layer thickness is much greater than that of the solute boundary layer, and that the modulation frequency is much smaller than the strength of plane stagnation-point flow. The solidifying interface is either stabilized or destabilized depending on the ratio of the period of modulation to the solute-diffusion time.
    Keywords: MATERIALS PROCESSING
    Type: Journal of Crystal Growth (ISSN 0022-0248); 96; 4, Au; 737-746
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Shallow cells in directional solidification (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The existing theory on two-dimensional transitions (appropriate to thin parallel-plate geometries) is presented in such a way that it is possible to identify easily conditions for the onset of shallow cells. Conditions are given under which succinonitrile-acetone mixtures should undergo supercritical bifurcation in experimentally accessible ranges. These results suggest a means for the quantitative test of the Mullins and Sekerka (1964) model and its weakly nonlinear extensions.
    Keywords: SOLID-STATE PHYSICS
    Type: Physical Review Letters (ISSN 0031-9007); 63; 573-575
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Similarity solutions for phase-change problems (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A modification of Ivantsov's (1947) similarity solutions is proposed which can describe phase-change processes which are limited by diffusion. The method has application to systems that have n-components and possess cross-diffusion and Soret and Dufour effects, along with convection driven by density discontinuities at the two-phase interface. Local thermal equilibrium is assumed at the interface. It is shown that analytic solutions are possible when the material properties are constant.
    Keywords: SOLID-STATE PHYSICS
    Type: Metallurgical Transactions A - Physical Metallurgy and Materials Science (ISSN 0360-2133); 20A; 225-235
    Format: text
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