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Experimental investigation into the self-similar mode of mixing of different density gases in the Earth's gravitational field

Published online by Cambridge University Press:  03 March 2004

Yu.A. KUCHERENKO
Affiliation:
Russian Federal Nuclear Center, Academician E.I. Zababakhin, All-Russian Research Institute of Technical Physics, Snezhinsk, Chelyabinsk, Russia
O.E. SHESTACHENKO
Affiliation:
Russian Federal Nuclear Center, Academician E.I. Zababakhin, All-Russian Research Institute of Technical Physics, Snezhinsk, Chelyabinsk, Russia
Yu.A. PISKUNOV
Affiliation:
Russian Federal Nuclear Center, Academician E.I. Zababakhin, All-Russian Research Institute of Technical Physics, Snezhinsk, Chelyabinsk, Russia
E.V. SVIRIDOV
Affiliation:
Russian Federal Nuclear Center, Academician E.I. Zababakhin, All-Russian Research Institute of Technical Physics, Snezhinsk, Chelyabinsk, Russia
V.M. MEDVEDEV
Affiliation:
Russian Federal Nuclear Center, Academician E.I. Zababakhin, All-Russian Research Institute of Technical Physics, Snezhinsk, Chelyabinsk, Russia
A.I. BAISHEV
Affiliation:
Russian Federal Nuclear Center, Academician E.I. Zababakhin, All-Russian Research Institute of Technical Physics, Snezhinsk, Chelyabinsk, Russia

Abstract

Experiments on self-similar Rayleigh–Taylor instability-induced mixing in gases in the Earth's gravity conducted on the OSA facility at the Russian Federal Nuclear Center–VNIITF are described. These experiments are distinguished from other experiments, usually performed with immiscible liquids in a tank or with miscible liquids initially separated by a solid barrier that is retracted, in that a membrane (of ∼1 μm thickness) with liquid soap film embedded in a thin wire array (with microconductors of diameter 20 μm and with a spacing of 4 mm) initially separates the fluids. An electric current to initiate the fluid interpenetration and mixing destroys the membrane. Experiments performed for three different Atwood numbers are described: in SF6-Ar with A = 0.54, in SF6-He with A = 0.94, and in Kr-Ar with A = 0.35. Various parameters of the mixing were measured from Schlieren photographs. In particular, the dimensionless rate of mixing front growth is α = 0.078.

Type
Research Article
Copyright
© 2003 Cambridge University Press

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