Abstract
This paper summarizes the content of a plenary lecture on the author’s personal research into the interactions between bubbles and sound fields, covering particular topics involving the climatically important gas exchange between atmosphere and ocean, the implications of bubbly ocean water to marine mammals that use sound, and the opportunities afforded by incorporating acoustical sensors onto probes launched to investigate other worlds in our solar system. It closes with recent data on the opportunities of bubble acoustics to investigate methods of cold water cleaning.
Highlights
Gas bubbles in liquids have an extraordinary ability to interact with sound fields
The way the oceans scatter and absorb sound, have since helped us understand the global carbon budget, as this paper will outline, Section 3 will describe how the dense clouds of bubbles are produced in the ocean by humpback whales to form ‘bubble nets’ to catch prey, and speculate on the acoustical implications for this
The acoustical implications are wholly different when dolphins hunt with bubble nets, as they must adapt their sonar to avoid the bubbles themselves preventing them from finding their prey using echolocation
Summary
Gas bubbles in liquids have an extraordinary ability to interact with sound fields. traditionally many people date the start of studies on collapse cavitation to the 1917 work of Rayleigh [1], Rayleigh’s well known analysis was predated by some 70 years by Stokes’ handwritten solution to an examination question on the problem that he set in 1847 for less able physics undergraduates (see Ref. [2] for details). More details on this topic are available on the Internet [48]
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