What is it about?
Inhomogeneous materials often have acoustic properties that are difficult to measure. One of these materials is bubbly liquids. Bubbly liquids are found in beer, ocean waves, and fish schools. This paper demonstrates a technique using pipes as resonators, akin to organ pipes, which react differently based on the material inside. Observing the resonance frequencies can provide information on the acoustic properties of the material in the tube. I the special case of bubbly liquids the mode shapes (eigenfunctions) can repeat. This is due to high amounts of dispersion.
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Why is it important?
Understanding the acoustics of bubble liquids is important to several different aspects of global climate change such as measuring the amount of fish in the ocean, mapping marine biomass, and determining the amount of gas dissolved in the ocean.
Perspectives
This bit of research is part of a bigger program during my Ph.D. work looking at the acoustics of schools of fish. I greatly enjoyed working with water-filled resonators. The team led by Preston Wilson at the University of Texas at Austin has a great history of refining techniques of measuring dispersive inhomogeneous media.
Dr Craig N Dolder
University of Southampton
Read the Original
This page is a summary of: Using one-dimensional waveguide resonators to measure phase velocities in bubbly liquids, The Journal of the Acoustical Society of America, April 2017, Acoustical Society of America (ASA),
DOI: 10.1121/1.4981013.
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