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We report an experimental observation of an instability in gas of constantdensity (air) with an initial non-uniform seeding of small droplets thatdevelops as a planar shock wave passes through the gas-droplet mix. The seedingnon-uniformity is produced by vertical injection of a slow-moving jet of airpre-mixed with glycol droplets into the test section of a shock tube, with theplane of the shock parallel to the axis of the jet. After the shock passage, weobserve development of two counter-rotating vortices in the plane normal tothat axis. The physical mechanism of the instability we observe is peculiar tomultiphase flow, where the shock acceleration causes the second (embedded)phase to move with respect to the embedding medium. With sufficient seedingconcentration, this leads to entrainment of the embedding phase that acquires arelative velocity dependent on the initial seeding, resulting in vortexformation in the flow.

Shock-driven hydrodynamic instability induced by particle seeding