The Low-Frequency Sound Speed of Fluid-Like Gas-Bearing Sediments

Abstract

The low-frequency sound speed in a fluid-like kaolinite sediment containing air bubbles was measured using an acoustic resonator technique and found to be 114 m/s with negligible dispersion between 100 and 400 Hz. The sediment's void fraction and bubble size distribution was determined from volumetric images obtained from x-ray computed tomography scans. A simplified version of Wood's effective medium model, which is dependent only upon the ambient pressure, the void fraction, the sediment's bulk mass density, and the assumption that all the bubbles are smaller than resonance size at the highest frequency of interest, described the measured sound speed.

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Document Details

Document Type
Technical Report
Publication Date
Jan 22, 2008
Accession Number
ADA498389

Entities

People

  • Allen H. Reed
  • Preston S Wilson
  • Ronald A. Roy
  • Warren T. Wood

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Advanced Electronics
  • Air Platforms
  • Space

DTIC Thesaurus Topics

  • Acoustic Measurement
  • Acoustic Properties
  • Acoustic Resonators
  • Acoustics
  • Bearings
  • Engineering
  • Frequency
  • Gas Bearings
  • Measurement
  • Military Research
  • Phyllosilicates
  • Resonance
  • Resonators
  • Standing Waves
  • Tomography
  • X Rays
  • X-Ray Computed Tomography

Readers

  • Acoustical Oceanography.
  • Aerosol Science/Aerosol Physics
  • Coastal Oceanography