Abstract
A cavitation bubble structure stable at high acoustic intensity (from 1.8 to more than 8.2 W/cm2) has been experimentally observed [A. Moussatov et al., Ultrason. Sonochem. 10, (2003)]. At the vincinity of an axisymmetrical radiating surface, big streamers of bubbles get ejected from the surface and build up a bubble structure of conical shape denoted CBS. In this paper, results on the observation and analysis of the CBS are reported for 20-kHz horn-type transducers with different sonotrode diameters. It is found that: (i) the CBS is always a zone of high chemical activity, even when the bubble structure is not observed due to high speed streaming; (ii) the geometry of the CBS is determined by nonlinear acoustic wave propagation. These results are supported by various experimental data: chemiluminescence measurements, high speed movies (2250 frames/s) under CW scattered light or LED flashes synchronized with driving signal and measurement of the acoustic pressure and of the time-averaged acoustic pressure. [Work supported by CNRS-CSIC cooperation project and European Union (FEDER 2).]
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 callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
