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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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    Boundary-layer analysis for the convection/diffusion transition in dendritic growth (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The supercooling dependence of dendritic growth kinetics under the influence of convective heat transport is investigated theoretically and experimentally with emphasis on theoretical prediction of the supercooling level at which the transition from diffusion-controlled to convection-controlled dendritic growth occurs. It is shown that the crossover between diffusive and convective transport depends on the relative thickness of the Stefan length compared with the thermal boundary layer. These lengths become equal at a supercooling which may be calculated from diffusion theory and fluid mechanics. It is also shown that the crossover supercooling varies weakly with the gravitational acceleration, melt viscosity, and the volumetric expansion coefficient.
    Keywords: SOLID-STATE PHYSICS
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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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
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