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  • Analytical Chemistry and Spectroscopy  (9,958)
  • Chemical Engineering  (6,138)
  • FLUID MECHANICS AND HEAT TRANSFER  (3,947)
  • SPACE SCIENCES
  • 1985-1989  (11,639)
  • 1980-1984  (8,404)
Collection
Keywords
Publisher
Years
Year
  • 1
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    Characteristic features of the operation of high-temperature heat pipes with a noncondesable gas (1987)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The principal concepts related to the nature of the processes occurring in high-temperature heat pipes with a noncondensable gas are examined, and guidelines for the development of such heat pipes are presented. The discussion is illustrated by experimental results obtained for a horizontal sodium heat pipe (diameter, 18/1 mm; length, 710 mm). In particular, attention is given to the starting dynamics and mechanisms, the shape of the vapor-gas front, and the vapor-gas front velocity.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TT-20015 , NAS 1.77:20015
    Format: text
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  • 2
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    Determination of the transition point in a boundary layer by the measurement of pressure fluctuation (1981)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A method is developed for determining the laminar-to-turbulent transition point in a boundary layer. The method involves the measurement of pressure on the surface of the body and the computation of pressure fluctuations. This method of determining the transition point is suitable when visualization methods cannot be used.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-76639
    Format: application/pdf
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  • 3
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    On the electrical heating of wires in rarefied gases by an electric current (1981)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Experimental work to determine the temperature dependence of the heat loss of thin wires in hydrogen is described. An explanation for the peculiar form of the current voltage curve is provided.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-76597
    Format: application/pdf
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  • 4
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    The influence of a local wall deformation on the development of natural instabilities in a laminar boundary layer (1981)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The natural instabilities which propagate in the laminar boundary layer of a flat plate composed of intermittent wave trains are described. A spectral analysis determines the frequency range and gives a frequency and the harmonic 2 only if there is a wall deformation. This analysis provides the amplitude modulation spectrum of the instabilities. Plots of the evolution of power spectral density are compared with the numerical results obtained from the resolve of the Orr-Sommerfeld equation, while the harmonic is related to a micro-recirculating flow near the wall deformation.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-76558
    Format: application/pdf
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  • 5
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    The hydrodynamic role of fish squamosal integument as an analog of surfaces directly formed by turbulent flow. Report 1: Similarity between irregularities in squamosal integument and those on surfaces formed by river bed flow (1980)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The distribution of squamae on the fish body and that of the deposits in the bed of the river can be described by the same equation. The curves reflecting the relative elongation and stability of the body shape of the fish continue the curves showing the elongation of bank spit and stability of the bed of the river.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-75390
    Format: application/pdf
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  • 6
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    Experimental investigation of turbulent flow in smooth and longitudinal grooved tubes (1984)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Turbulent flow in tubes with and without longitudinal grooves is examined. The discovery of fine grooves forming a sort of streamline pattern on the body of sharks led to the expectation that the grooves on a surface reduce the momentum change, and thus the drag. To test this thesis, drag law, velocity profile and the profile of the velocity fluctuation were determined. Results show that for moderate Reynolds numbers the drag coefficient for grooved tubes is about 3 percent smaller than that of the smooth tubes. At higher Reynolds numbers, however, the drag coefficient for grooved tubes becomes larger than that for smooth tubes. No significant differences in the velocity profiles between grooved tubes and smooth tubes are found.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-77480 , NAS 1.15:77480
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  • 7
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    Analysis method for the production of Reynolds stresses in compressible turbulent flow (fluid mechanics) (1988)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A geometrical interpretation of the grouping and variation rate terms of Reynolds stresses in compressible turbulent flow is presented. Examples of applications of the method are also given.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TT-20330 , NAS 1.77:20330
    Format: text
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  • 8
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    Studies on pressure response of gas bubbles contributions of condensed droplets in bubbles generated by a uniform nucleation (1988)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The response of a tiny gas bubble under reduced pressure is investigated in its relation to cavitation. Equations of motion are formulated for gas mixtures inside the bubble and numerical calculations performed for several examples. The conclusions are as follows: (1) at the onset of bubble growth, the gas mixture inside it adiabatically expands and the temperature decreases. Condensed droplets appear inside the gas mixture due to a uniform nucleation and the temperature recovers, thus the motion of the bubble is apparently isothermal; (2) the evaporation and condensation coefficient largely affects bubble motions (maximum radius, period and rate of attenuation of the bubble oscillation) including the uniform contraction; (3) the oscillation period of the bubble is longer as the equilibrium bubble radius is larger when the surrounding pressure decreases stepwise. In this circumstance the temperature inside the bubble is kept constant due to condensation evaporation phenomena and is nearly isothermal; and (4) when the surrounding pressure decreases in a stepwise fashion, the critical pressure bubble radius relation becomes closer to that for the isothermal process if the bubble radius is larger than 8 microns.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TT-20343 , NAS 1.77:20343
    Format: text
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  • 9
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    Existence of a natural instability not predicted by theory and connected to a wall deformation in a laminar boundary layer (1981)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Natural instability related to negative wall deformation was studied. It was shown that natural instabilities which propagate in a laminar boundary layer of a flat plate are in agreement with stability theory. It is found that if a wall has a deformation, a second frequency does exist, which is not predicted and is twice the first frequency. This second instable frequency only appears if there is a negative velocity gradient. The phenomenon is located very closely to the wall and drops off rapidly when moved away from it.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-76559
    Format: application/pdf
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  • 10
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    An experimental investigation on the subcritical instability in plane Poieseuille flow (1981)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The relationship between the three dimensional properties of the fundamental flow of a plane Poieseuille flow and subcritical stability was studied. An S-T wave was introduced into the flow and the three dimensional development of the wave observed. Results indicate that: (1) the T-S wave has three dimensional properties which are synchronous with the fundamental flow, but there is damping at microamplitude; (2) when the amplitude reaches a certain threshold, subcritical instability and peak valley bifurcation occur simultaneously and a peak valley structure is formed; (3) this threshold depends to a great extent on the frequency; and (4) after the peak valley bifurcation there is a transition to a turbulent flow by the process of laminar flow collapse identical to that in Blasius flow.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-75885
    Format: application/pdf
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