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 parameterize 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 dissipation rate is found to be 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.
Publisher
Department of Theoretical and Applied Mechanics. College of Engineering. University of Illinois at Urbana-Champaign
Series/Report Name or Number
TAM R 742
1993-6040
ISSN
0073-5264
Type of Resource
text
Language
eng
Permalink
http://hdl.handle.net/2142/112433
Sponsor(s)/Grant Number(s)
National Science Foundation 93/12
Copyright and License Information
Copyright 1993 Board of Trustees of the University of Illinois
TAM technical reports include manuscripts intended for publication, theses judged to have general interest, notes prepared for short courses, symposia compiled from outstanding undergraduate projects, and reports prepared for research-sponsoring agencies.
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