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An experimental investigation of mixing mechanisms in shock-accelerated flow

Published online by Cambridge University Press:  25 September 2008

C. TOMKINS ,
S. KUMAR ,
G. ORLICZ  and
K. PRESTRIDGE
C. TOMKINS
Affiliation:
Physics Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
S. KUMAR
Affiliation:
Physics Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
G. ORLICZ
Affiliation:
Physics Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
K. PRESTRIDGE
Affiliation:
Physics Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
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Abstract

An experimental investigation of mixing mechanisms in a shock-induced instability flow is described. We obtain quantitative two-dimensional maps of the heavy-gas (SF6) concentration using planar laser-induced fluorescence for the case of a shock-accelerated cylinder of heavy gas in air. The instantaneous scalar dissipation rate, or mixing rate, χ, is estimated experimentally for the first time in this type of flow, and used to identify the regions of most intense post-shock mixing and examine the underlying mechanisms. We observe instability growth in certain regions of the flow beginning at intermediate times. The mixing rate results show that while these unstable regions play a significant role in the mixing process, a large amount of mixing also occurs by mechanisms directly associated with the primary instability, including gradient intensification via the large-scale strain field in a particular non-turbulent region of the flow.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 611 , 25 September 2008 , pp. 131 - 150
Copyright
Copyright © Cambridge University Press 2008

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