Velocity slip of gas mixtures in free jet expansions
- Resource Type
- Conference
- Authors
- Source
- Conference: 10. international symposium on rarefied gas dynamics, Aspen, CO, USA, 18 Jul 1976
- Subject
- 11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
42 ENGINEERING ISOTOPE SEPARATION
SEPARATION NOZZLE METHOD
JETS
EXPANSION
KNUDSEN FLOW
ARGON
DOPPLER EFFECT
ELECTRON BEAMS
FLUORESCENCE
GAS FLOW
HELIUM
HYPERSONIC FLOW
MEASURING METHODS
MOLECULAR BEAMS
NOZZLES
RADIAL VELOCITY
VELOCITY
BEAMS
CRYOGENIC FLUIDS
ELEMENTS
FLUID FLOW
FLUIDS
LEPTON BEAMS
LUMINESCENCE
NONMETALS
PARTICLE BEAMS
RARE GASES
SEPARATION PROCESSES 050500* -- Nuclear Fuels-- Uranium Enrichment
640301 -- Atomic, Molecular & Chemical Physics-- Beams & their Reactions
420400 -- Engineering-- Heat Transfer & Fluid Flow
- Language
- English
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.