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  • Other Sources  (4,613)
  • GEOPHYSICS  (3,123)
  • FLUID MECHANICS AND HEAT TRANSFER  (1,490)
  • Humans
  • 1980-1984  (4,613)
  • 1
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    Studies on the behavior of ammonia and ammonium salts in the atmosphere (1) - Fractional collection of ammonia gas and particulate ammonium (1981)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Methods for the fractional collection of trace amounts of atmospheric ammonia gas and ammonium particles on a two staged glass fiber filter are summarized. A standard glass fiber filter washed with distilled water and dried at 120 to 130 C was used. A second filter was impregnated with a mixture of 3% boric acid and 25% glycerin solution. The blank of glass fiber filters impregnated with a mixture of the above solution was very low for ammonia, i.e. 0.06 micrograms in a filter of 47 mm in diameter. The mean concentrations of ammonia and ammonium in air at Kawasaki, a polluted area, were 7.6 and 2.3 micrograms cu m, and those at Sanriku, an unpolluted area 0.9 and 0.2 micrograms cu m, respectively. Ratios of concentration levels of ammonium to total ammonia in the atmosphere were 0.3 and 0.2 for the polluted and unpolluted areas, respectively. Ammonium salts in air at both areas were not correlated with relative humidity. Variations in time of ammonia concentrations and sources in surrounding areas are also considered.
    Keywords: GEOPHYSICS
    Type: NASA-TM-76582
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 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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    Method of determination of the mass composition of ring current ions (1980)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A method for individual registration of protons, and helium and oxygen ions, with energies E for a charge on the order of 100 kev/q in the ring currents of the Earth's magnetosphere was examined. The method is based on the various specific losses in energy by these ions in matter. The ion current, selected according to E/q, is passed through a solid target, after which identification of the masses is carried out, based on the energy losses in the possibly to reliably divide the flows of protons, and helium and oxygen ions.
    Keywords: GEOPHYSICS
    Type: NASA-TM-76246
    Format: application/pdf
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  • 7
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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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  • 8
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    Meridional heat transport at the onset of winter stratospheric warming (1981)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A continuous vertical flow of energy toward high altitude was verified. This process produced a dynamic instability of the stratospheric polar vortex. A meridional heat transport ws primed toward the north, which generated a warming trend.
    Keywords: GEOPHYSICS
    Type: NASA-TM-76614
    Format: application/pdf
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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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