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Visualization of High Speed Liquid Jet Impaction on a Moving Surface
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Solid-particle jet formation under shock-wave acceleration.

V Rodriguez1, R Saurel1, G Jourdan1

  • 1Aix-Marseille Université, IUSTI, UMR CNRS 7343, Marseille, France.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|February 4, 2014
PubMed
Summary
This summary is machine-generated.

Solid particles dispersed by shock waves form jets. This study reveals jets originate within the particle ring and their number decreases over time, influenced by overpressure and material density.

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Area of Science:

  • Fluid Dynamics
  • Granular Physics
  • Wave Propagation

Background:

  • Shock waves cause impulsive dispersal of solid particles.
  • Particle jet formation and selection mechanisms remain poorly understood.
  • Existing 3D experiments lack detailed observation of initial jet formation.

Purpose of the Study:

  • Investigate particle dispersal and fingering effects using a novel quasi-2D facility.
  • Characterize the mechanism of particle jet formation and selection.
  • Analyze the influence of experimental parameters on jet characteristics.

Main Methods:

  • Impulsive dispersal of solid particles within a granular medium ring.
  • Generation of shock and blast waves in a carrier gas.
  • Utilizing a quasi-two-dimensional Hele-Shaw cell for particle confinement.
  • High-speed flow visualization for detailed observation.

Main Results:

  • Particle jets are clearly observed, originating inside the particle ring before outward expulsion.
  • The number of particle jets is unsteady and decreases with time.
  • Jet size selection is independent of particle diameter at early times.
  • Jet wave number increases with initial overpressure and decreases with material density.
  • A power law relationship is found between normalized jet number and initial ring acceleration.

Conclusions:

  • The quasi-2D experimental setup provides unique insights into particle jet formation.
  • Jet dynamics are significantly influenced by wave parameters and material properties.
  • Observed phenomena, such as internal jet initiation, differ from 3D experiments.