Physics
Scientific paper
Oct 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974phfl...17.1793c&link_type=abstract
Physics of Fluids, vol. 17, Oct. 1974, p. 1793-1807. NSF-supported research.
Physics
24
Flow Velocity, Free Jets, Gas Expansion, Hypersonic Flow, Unsteady Flow, Electron Beams, Fabry-Perot Interferometers, Fluorescence, Helium, Kinetic Theory
Scientific paper
The velocity distribution function for helium in translational nonequilibrium in hypersonic free jet expansions has been investigated with an electron beam fluorescence technique. A unique computer controlled Fabry-Perot interferometer and data acquisition system has been used to observe the 5015.67 A radiation from the 31P-21S transition in helium. From the spectral structure, the Doppler broadening and shift of the line due to the velocity distribution function can be determined. With this technique parallel and perpendicular gas kinetic temperatures, mean flow velocity, and relative density measurements were made along the centerline of the free jet, from near equilibrium conditions through the midpoint of transition. A comparison with kinetic theory predictions of the temperatures and velocity distribution functions indicates that the adoption of the ellipsoidal model, although sufficient for fitting the measured distribution function, is inadequate for determining the parallel temperature.
Cattolica R.
Robben F.
Talbot L.
Willis D. R.
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