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  • Journals
  • Other Sources  (4)
  • FLUID MECHANICS AND HEAT TRANSFER
  • 1965-1969  (4)
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  • Journals
  • Other Sources  (4)
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  • 1
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    Numerical results in the statistical theory of thermal turbulence (1969)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: Several statistical theories of turbulence are applied to thermal convection problem, and are compared in a series of numerical calculations. Results are presented for both the case of very large and very small Prandtl numbers, and for moderate Rayleigh numbers. The theories compared are the direct-interaction approximation, the self-consistent field approximation, the quasi-linear approximation, the quasi-normal approximation, and a 'Markovianized' quasi-normal approximation. Results for these theories are then compared with some simple exact solutions to the statistical problem. The results indicate that the direct-interaction and the self-consistent field method give satisfactory results at all Rayleigh numbers investigated, whereas the procedures based on the quasi-normal approximation give sensible results only at small Rayleigh numbers.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Boeing Scientific Research Labs., Symposium on Turbulence; 1 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Heat pipe application for spacecraft thermal control (1967)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-CR-163017 , SDO-2039
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Thermal contact conductance between metals in a vacuum environment (1965)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Basic heat transfer data for structural materials used in the Saturn 1B/V 1U component case structural design were obtained. The main emphasis is on thermal contact conductance between dissimilar metallic surfaces, since thermal conductivity values within solids have been sufficiently established previously. The test program outline and test results are described. The following materials were tested: aluminum 6061-T6 (12 samples), aluminum 356 (as cast), almag 35 (as cast), magnesium AZ91C-T4 (4 samples), and mag lithium LA-141 (2 samples).
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-CR-149959
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Mechanics of Boundary Layer Transition. Part 5: Boundary Layer Stability theory in incompressible and compressible flow (1967)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The fundamentals of stability theory, its chief results, and the physical mechanisms at work are presented. The stability theory of the laminar boundary determines whether a small disturbance introduced into the boundary layer will amplify or damp. If the disturbance damps, the boundary layer remains laminar. If the disturbance amplifies, and by a sufficient amount, then transition to turbulence eventually takes place. The stability theory establishes those states of the boundary layer which are most likely to lead to transition, identifys those frequencies which are the most dangerous, and indicates how the external parameters can best be changed to avoid transition.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-CR-162112 , VKI-LECTURE-SERIES-3-PT-5 , Jan 15, 1968 - Jan 19, 1968; Rhodes-Saint-Genese; Belgium
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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