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  • Other Sources  (3)
  • FLUID MECHANICS  (3)
  • 1
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    Rotational temperature determination in flowing nitrogen using an electron beam (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The measurement of rotational temperature by the electron-beam fluorescence technique is investigated for temperatures between 78 K and 300 K by using the 0-0 band of the nitrogen first negative system. Existing methods for calculating the rotational temperature from electron-beam spectra result in values which are higher than the true temperature and the error increases with density and electron-beam current. The errors are believed to arise through neglect of the effects of secondary electrons. Excitation by low-energy secondary electrons can increase the population of the sparsely populated rotational ground states at the expense of the abundantly populated states. This secondary excitation is proposed as the cause of the error in the calculated rotational temperature and a theoretical study determines that the density and beam current govern the excitation rate. Rotational-temperature measurements are made in a flowing stream of nitrogen at a known temperature for a range of densities and beam currents.
    Keywords: FLUID MECHANICS
    Type: NASA-TN-D-6576 , L-8011
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Diffusive separation in free jets of nitrogen and helium mixtures (1969)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Species concentration, jet structure and diatomic nitrogen rotational temperature measured for diffusive separation of nitrogen-helium mixture free jets, using electron beam
    Keywords: FLUID MECHANICS
    Type: RAREFIED GAS DYNAMICS, SIXTH INTERNATIONAL SYMPOSIUM, MASSACHUSETTS INST. OF TECH.; Jul 22, 1968 - Jul 26, 1968; CAMBRIDGE, MA
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Diffusive separation in free jets of nitrogen and helium mixtures (1968)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Diffusive separation in helium nitrogen jets by electron beam measurements
    Keywords: FLUID MECHANICS
    Type: NASA-TM-X-61220 , INTERN. SYMP. ON RAREFIED GAS DYNAMICS; Jul 22, 1968 - Jul 26, 1968; CAMBRIDGE, MA; UNITED STATES
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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