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Related Experiment Videos

Acoustic transmission across a roughened fluid-fluid interface.

R Lim1, I C Paustian, J L Lopes

  • 1Coastal Systems Station, Panama City, Florida 32407-7001, USA.

The Journal of the Acoustical Society of America
|April 28, 2001
PubMed
Summary

Tank experiments revealed that roughened fluid interfaces scatter significant acoustic energy. Discrepancies between observed scattering and Bragg predictions were attributed to near-field effects and ignored scattering directionality.

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Area of Science:

  • Acoustics
  • Fluid Dynamics
  • Materials Science

Background:

  • Anomalous acoustic transmission through fluid interfaces is observed in field experiments.
  • Heuristic Bragg scattering predictions are used to explain these observations.
  • Simulating interface roughness is key to understanding acoustic behavior.

Purpose of the Study:

  • Investigate acoustic transmission across roughened fluid-fluid interfaces.
  • Test heuristic Bragg scattering predictions.
  • Identify reasons for discrepancies between predictions and experimental observations.

Main Methods:

  • Tank experiments using immiscible fluids (vegetable oil/glycerin).
  • Simulated interface roughness with polystyrene beads of varying diameters.

Related Experiment Videos

  • Acoustic measurements using a hydrophone array and beamforming in the 100-200 kHz range.
  • Comparison of experimental data with computer simulations.

    • Main Results:

    • Significant acoustic energy scattering into the bottom fluid layer by interface beads.
    • Scattered acoustic levels increased with increasing bead diameter.
    • Discrepancies observed between measured propagation properties and Bragg scattering predictions.

    Conclusions:

    • Near-field reception effects and ignored scattering directionality explain discrepancies with Bragg predictions.
    • Findings have implications for interpreting acoustic observations in field experiments.
    • Understanding interface scattering is crucial for accurate acoustic modeling.