Abstract
Introduction Applications of acoustic cavitation gain in importance and become more widespread recently. While its utilization in traditional fields persists and is subject to optimization, new types and areas of application emerge as well. In many cases, however, it is realized that not all physical processes involved are well enough understood yet. In particular the link between process parameters like acoustic field geometry, frequency or intensity, and the observed or desired effects, might not be sufficiently clear. This is sometimes true even qualitatively, and then a quantitative analysis is naturally out of the scope anyway. An important aspect of this link in acoustic cavitation is the formation of bubble structures: The applied sound field generates certain bubble distributions in space and time with specific bubble size populations, which in turn mediate the microscopic effects via their oscillation and/or collapse properties. A systematic characterization and comprehension of different bubble structures has started only recently [1], and here we want to give a further contribution to advance the knowledge with respect to the process chain in acoustic cavitation. A distinct bubble structure at 230 kHz has been observed and investigated by means of high-speed recordings, sonoluminescence measurements, and cleaning tests. We speculate that the observed phenomena are universal for a class of acoustic field geometries over a broader frequency range.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call