Accession Number:

ADA539977

Title:

The Physics of Sound Scattering From, and Attenuation Through, Compliant Bubbly Mixtures

Descriptive Note:

Annual rept.

Corporate Author:

NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI

Personal Author(s):

Report Date:

1998-09-30

Pagination or Media Count:

6.0

Abstract:

The goal of this research is to acquire a quantitative understanding, leading to predictive models, of the broader aspects of linear and nonlinear sound scattering and transmission in bubbly mixtures pertinent to the shallow water ocean acoustics scenario. This includes a conceptual understanding of the role played by stabilization mechanisms in bubble dynamics and longevity. Of particular interest is the phenomenological delineation of different regimes of behavior. An objective specific to this project is the extension of the theory of sound transmission in bubbly liquids to derive bubbly-fluid attenuation characteristics for both small amplitude linear response and large amplitude nonlinear response forcing, ultimately incorporating the effects of contaminating surface-active solutes. A second objective is the development of a unique laboratory capability for the precise and accurate measurement of the frequency-dependent complex acoustic impedance of well characterized bubble clouds. Cloud characterization implies the precise knowledge of all bubble population statistics, both spatially and size-wise.

Subject Categories:

  • Physical and Dynamic Oceanography
  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE