Journal Article10.1002/AIC.690460404
Mapping the cavitation intensity in an ultrasonic bath using the acoustic emission
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TL;DR: In this article, a method for separate identification and determination of the spatial distribution of the two components of the energy intensity in an ultrasound bath (due to the ultrasound waves and cavitation activity) uses two media -water and noncavitating (silicon oil) under the conditions of the acoustic field in the ultrasound bath.
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Abstract: A new method for separate identification and determination of the spatial distribution of the two components of the energy intensity in an ultrasound bath (due to the ultrasound waves and cavitation activity) uses two media - cavitating (water) and noncavitating (silicon oil) - under the conditions of the acoustic field in the ultrasound bath. The variation of cavitation intensity in the frequency domain was obtained by subtracting the acoustic emission spectrum of silicon oil from that of water. Measurements at various locations in the bath revealed significant spatial variations in the cavitation intensity in the bath. The local cavitation phenomena in the bath (stable or transient cavitation) were explained based on the spectral characteristics of acoustic emission. The radial dynamics of the bubbles at the location of cavitation intensity measurements was determined using the Gilmore model of bubble dynamics. The bubbles in the region of highest cavitation intensity underwent a transient motion, while the bubbles in the region of lowest cavitation intensity underwent stable/oscillatory motion. The transient collapse of the bubbles that gives rise to local temperature and pressure maxima is at the root of the observed effects of ultrasound on chemical systems. The more violent the collapse of the bubbles, the higher the local cavitation intensity. It was verified using the spectral characteristics of the acoustic emission and simulation of the radial motion of the bubbles.
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Citations
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138
References
Quantification of cavitation intensity in fluid bulk
M.M. Chivate,Aniruddha B. Pandit +1 more
TL;DR: In this article, a simple method is proposed for an approximate quantification of the impulse pressure intensity produced during asymmetric oscillations or collapse of a vapour cavity at a certain distance from an ultrasonic horn.
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Modeling of three-dimensional pressure fields in sonochemical reactors with an inhomogeneous density distribution of cavitation bubbles. Comparison of theoretical and experimental results.
TL;DR: In this paper, a numerical calculation of the three-dimensional linear sound pressure field distribution in a commonly used sonoreactor containing three transducers is carried out using the finite difference approach.
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Chemical reactions under ultrasound: discrimination of chemical and physical effects
TL;DR: In this article, liquid-solid mass transfer measurements under ultrasound are presented and compared to reaction conversions, with two emission conditions: a transducer located at the bottom of a cylindrical reactor, or a horn dipping into a vessel.
93
The acoustic emissions from single-bubble sonoluminescence
Thomas J. Matula,Ibrahim M. Hallaj,Robin O. Cleveland,Lawrence A. Crum,William C. Moss,Ronald A. Roy +5 more
TL;DR: In this article, the acoustic emissions from single-bubble sonoluminescence were measured using a small 200-μm aperture PVDF needle hydrophone and a focused 10-MHz transducer.
88
Design of thermistor probes for measurement of ultrasound intensity distributions
C.J. Martin,A.N.R. Law +1 more
TL;DR: In this article, the use of various glues, varnishes and resins for the ultrasound absorbing coating is considered and the rate of temperature rise over the first one or two hundred milliseconds after the ultrasound is switched on is a reasonably linear function of intensity over the range used in physiotherapy.
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