Energy analysis during acoustic bubble oscillations
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Date
2014
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Journal ISSN
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Publisher
Elsevier
Abstract
In this work, energy analysis of an oscillating isolated spherical bubble in water irradiated by an ultrasonic
wave has been theoretically studied for various conditions of acoustic amplitude, ultrasound frequency,
static pressure and liquid temperature in order to explain the effects of these key parameters
on both sonochemistry and sonoluminescence. The Keller–Miksis equation for the temporal variation
of the bubble radius in compressible and viscous medium has been employed as a dynamics model.
The numerical calculations showed that the rate of energy accumulation, dE/dt, increased linearly with
increasing acoustic amplitude in the range of 1.5–3.0 atm and decreased sharply with increasing frequency
in the range 200–1000 kHz. There exists an optimal static pressure at which the power w is highest.
This optimum shifts toward a higher value as the acoustic amplitude increases. The energy of the
bubble slightly increases with the increase in liquid temperature from 10 to 60 C. The results of this
study should be a helpful means to explain a variety of experimental observations conducted in the field
of sonochemistry and sonoluminescence concerning the effects of operational parameters