Morphology Of Shock-accelerated Multiphase
Flow: Experiment And Modeling
Author(s)
P. Vorobieff, M. Anderson, J. Conroy, C. Randall Truman & S. Kumar
Abstract
It was recently observed that vortices develop in multiphase media of non-uniform
average density undergoing acceleration. This vortex formation is somewhat akin
to vortex roll-up in gases of fluids (single-phase) due to Rayleigh–Taylor or Richtmyer—
Meshkov instabilities. Differences in the underlying physics are negligible
in the case of sustained modest acceleration (Rayleigh–Taylor instability), where
conservation of momentum accounts for different velocities of volumes with
different average densities. In the case of impulsive acceleration, the mechanism
responsible for the multiphase analog of Richtmyer–Meshkov instability is
peculiar to multiphase flow and is explained by post-acceleration interaction of the
embedded phase (e.g., droplets) with the embedding phase (e.g., gas). Impulsive
acceleration of a multiphase medium can also produce spatial rearrangement
of the embedded particles or droplets in accordance with their size, noticeably
altering the observed flow morphology. A careful numerical simulation explicitly
accounting for the embedded phase behavior is required to faithfully reproduce the
experimental results.
Keywords
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