Velocity slip of gas mixtures in free jet expansions
Velocity slip in gas mixtures of argon and helium in axisymmetric free jet expansions has been measured using a grating monochromator together with a computer-controlled Fabry-Perot interferometer to observe the fluorescence excited by an electron beam. The Doppler shift between the fluorescence observed parallel and perpendicular to the centerline of the free jet was used to measure the mean velocity of a particular species along the jet centerline, employing the 4880 A line for argon and the 5016 A line for helium. By alternately tracking the parallel and perpendicular fluorescence, the Doppler shift due to the mean velocity was measured directly with an accuracy of 1 percent. Flow field surveys have been made in the initial acceleration region where the flow becomes hypersonic and in the far field region. The differences between argon and helium mean velocities (velocity slip) are in good agreement with molecular beam data and show a correlation with an inverse Knudsen number.
- Research Organization:
- Sandia Labs., Livermore, CA (USA); California Univ., Los Angeles (USA)
- DOE Contract Number:
- E(29-1)-789
- OSTI ID:
- 7311634
- Report Number(s):
- SAND-76-8616; CONF-760710-7
- Country of Publication:
- United States
- Language:
- English
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71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ARGON
BEAMS
CRYOGENIC FLUIDS
DOPPLER EFFECT
ELECTRON BEAMS
ELEMENTS
EXPANSION
FLUID FLOW
FLUIDS
FLUORESCENCE
GAS FLOW
HELIUM
HYPERSONIC FLOW
ISOTOPE SEPARATION
JETS
KNUDSEN FLOW
LEPTON BEAMS
LUMINESCENCE
MEASURING METHODS
MOLECULAR BEAMS
NONMETALS
NOZZLES
PARTICLE BEAMS
RADIAL VELOCITY
RARE GASES
SEPARATION NOZZLE METHOD
SEPARATION PROCESSES
VELOCITY