Diffusion of ultrasound in a glass bead slurry

Richard L. Weaver, Wolfgang Sachse

Research output: Contribution to journalArticlepeer-review

Abstract

The ultrasonic energy density in a close-packed disordered assemblage of glass beads immersed in water is shown to evolve in accordance with a diffusion equation. The diffusion and dissipation rates which parametrize the evolution equation are shown to be recoverable from the observed energy densities. The recovered diffusivity exhibits a frequency dependence which characterizes the microscale length and is in qualitative accord with theory. The recovered diffusivity also shows a slight dependence on source/receiver separation which is inconsistent with the hypothesized diffusion model; potential causes for this behavior are discussed. The recovered dissipation rate is greater than predicted by a model of viscous shear loss at solid/fluid interfaces. An estimate for the proximity of the Anderson transition is constructed.

Original languageEnglish (US)
Pages (from-to)2094-2102
Number of pages9
JournalJournal of the Acoustical Society of America
Volume97
Issue number4
DOIs
StatePublished - Apr 1995

ASJC Scopus subject areas

  • Arts and Humanities (miscellaneous)
  • Acoustics and Ultrasonics

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