Measurements of Bubble Properties Using a Multi-Frequency Sound Field
Abstract
An apparatus was designed, constructed, and tested to measure properties of single bubbles in a fluid by use of a multi-frequency sound field. The theoretical background on the dual frequency method for obtaining bubble properties such as resonance frequency, rectified diffusion thresholds and rates, rise-time sizing, and damping coefficients are discussed. Specifications and design of the device are presented. Sizes of single air bubbles in water determined from dual frequency methods are compared to rise-time sizing for radii from 30 to 100 microns, these two methods are shown to agree within 1%. Rectified diffusion rates measured above, at, and below threshold for an initial bubble radius of 50 microns in air-saturated water over a period of 700 seconds were measured and the results demonstrated the reliability of the system. The potential of this device to measure damping coefficient is discussed. Keywords: Bubble resonance frequency; Nonlinear bubble dynamics; Rise time bubble sizing; Dual frequency; Rectified diffusion damping; Theses.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1989
- Accession Number
- ADA212591
Entities
People
- Robert A. Perron
Organizations
- Naval Postgraduate School