Study of the membrane effect on turbulent mixing measurements in shock tubes |
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Authors: | L Erez O Sadot D Oron G Erez LA Levin D Shvarts G Ben-Dor |
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Institution: | (1) Department of Physics, Ben Gurion University of the Negev, Beer Sheva, Israel, IL;(2) Department of Physics, Nuclear Research Center-Negev, Israel, IL;(3) Pearlstone Center for Aeronautical Engineering Studies, Department of Mechanical Engineering, Ben Gurion University of the Negev, Beer Sheva, Israel, IL |
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Abstract: | The effect of the thin membrane on the time evolution of the shock wave induced turbulent mixing between the two gases initially
separated by it is investigated using two different sets of experiments. In the first set, in which a single-mode large-amplitude
initial perturbation was studied, two gas combinations (air/SF
and air/air) and two membrane thicknesses were used. The main conclusion of these experiments was that the tested membrane has a negligible
effect on the evolution of the mixing zone, which evolves as predicted theoretically. In the second set, in which similar
gas combinations and membrane thicknesses were used, small amplitude random-mode initial perturbation, caused by the membrane
rupture, rather than the large amplitude single-mode initial perturbation used in the first set, was studied. The conclusions
of these experiments were: (1) The membrane has a significant effect on the mixing zone during the initial stages of its growth.
This has also been observed in the air/air experiment where theoretically no growth should exist. (2) The membrane effect on the late time evolution, where the mixing
zone width has reached a relatively large-amplitude, was relatively small and in good agreement with full numerical simulations.
The main conclusion from the present experiments is that the effect of the membrane is important only during the initial stages
of the evolution (before the re-shock), when the perturbations have very small amplitudes, and is negligible when the perturbations
reach relatively large amplitudes.
Received 29 August 1998 / Accepted 25 December 1998 |
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Keywords: | : Richtmyer-Meshkov instability Turbulent mixing Shock tube Membrane effect |
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