Multiple observations of cavitation cluster dynamics close to an ultrasonic horn tip
Birkin, Peter R., Offin, Douglas G., Vian, Christopher J.B. and Leighton, T.G. (2011) Multiple observations of cavitation cluster dynamics close to an ultrasonic horn tip. The Journal of the Acoustical Society of America, 130, (5), 3379-3388. (doi:10.1121/1.3650536).
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Bubble dynamics in water close to the tip of an ultrasonic horn (∼23 kHz, 3 mm diameter) have been studied using electrochemistry, luminescence, acoustics, light scattering, and high-speed imaging. It is found that, under the conditions employed, a large bubble cluster (∼1.5 mm radius) exists at the tip of the horn. This cluster collapses periodically every three to four cycles of the fundamental frequency of the horn. Following the collapse of the cluster, a short-lived cloud of small bubbles (each tens of microns in diameter) was observed in the solution. Large amplitude pressure emissions are also recorded, which correlate temporally with the cluster collapse. Bursts of surface erosion (measured in real time using an electrochemical technique) and multibubble sonoluminescence emission both also occur at a subharmonic of the fundamental frequency of the horn and are temporally correlated with the bubble cluster collapse and the associated pressure wave emission.
|Subjects:||Q Science > QC Physics|
|Divisions:||Faculty of Engineering and the Environment > Institute of Sound and Vibration Research > Acoustics Group
Faculty of Natural and Environmental Sciences > Chemistry > Electrochemistry & Surface Science Group
|Date Deposited:||25 Apr 2012 16:30|
|Last Modified:||14 Apr 2014 11:40|
A high-speed imaging system for Acoustoelectrochemistry
Funded by: EPSRC (EP/D05849X/1)
Led by: Peter Robert Birkin
1 June 2006 to 31 May 2010
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