Apparatus to Determine the Complex Mass of a Viscous Fluid Contained in a Rigid Porous Solid from Acoustic Pressure Measurements

Abstract

Two experimental techniques to determine the frequency-dependent complex mass of a viscous fluid contained in a rigid porous solid are investigated. In one technique the moving mass of the fluid is by its effect on the measured input electrical impedance of a moving coil transducer. In the second technique the moving mass is extracted from the measured acoustic pressure required for the fluid to oscillate with a known amplitude through the solid frame. A description of the apparatus and preliminary results using the pressure method as well as a comparison of the two techniques are presented. Keywords: Acoustic impedance; Acoustic coupler; Complex mass density; Fluid saturated; Porous media; Theses.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1989
Accession Number
ADA223709

Entities

People

  • Robert A. Mirick

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Acoustic Propagation
  • Acoustic Properties
  • Acoustic Waves
  • Acoustics
  • Amplifiers
  • Calibration
  • Chemistry
  • Elastic Waves
  • Electrical Impedance
  • Frequency
  • Impedance
  • Measurement
  • Mechanical Impedance
  • Seabed
  • Transducers
  • Underwater Acoustics
  • United States Naval Academy

Readers

  • Fluid Dynamics.
  • Microwave Engineering.