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Research Papers

A Condition Monitoring for Collapsing Bubble Mechanism for Sonoluminescence and Sonochemistry

[+] Author and Article Information
Ali Alhelfi

Department of Energy Sciences,
Lund University,
Box 118,
Lund SE-22100, Sweden

Bengt Sundén

Department of Energy Sciences,
Lund University,
Box 118,
Lund SE-22100, Sweden
e-mail: bengt.sunden@energy.lth.se

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received October 10, 2014; final manuscript received January 12, 2015; published online February 18, 2015. Assoc. Editor: John C. Chai.

J. Thermal Sci. Eng. Appl 7(2), 021014 (Jun 01, 2015) (8 pages) Paper No: TSEA-14-1235; doi: 10.1115/1.4029679 History: Received October 10, 2014; Revised January 12, 2015; Online February 18, 2015

The acoustic cavitation phenomenon is a source of energy for a wide range of applications such as sonoluminescence and sonochemistry. The behavior of a single bubble in liquids is an essential study for acoustic cavitation. The bubbles react with the pressure forces in liquids and reveal their full potential when periodically driven by acoustic waves. As a result of extreme compression of the bubble oscillation in an acoustic field, the bubble produces a very high pressure and temperature during collapse. The temperature may increase many thousands of Kelvin, and the pressure may approach up to hundreds of bar. Subsequently, short flashes can be emitted (sonoluminescence) and the high local temperatures and pressures induce chemical reactions under extreme conditions (sonochemistry). Different models have been presented to describe the bubble dynamics in acoustic cavitation. These studies are done through full numerical simulation of the compressible Navier–Stokes equations. This task is very complex and consumes much computation time. Several features of the cavitation fields remain unexplained. In the current model, all hydrodynamics forces acting on the bubble are considered in the typical solution. Bubble oscillation and its characteristics under the action of a sound wave are presented in order to improve and give a more comprehensive understanding of the phenomenon, which is considered to have a significant role in different areas of science and technology.

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Topics: Bubbles , Pressure
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References

Figures

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Fig. 1

Schematic representation of a cavitating bubble in a liquid with an ultrasound field

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Fig. 2

Calculation region for the implicit FDM

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Fig. 12

The calculated bubble surface velocity and acceleration at the collapse point for the bubble shown in Fig. 3

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Fig. 13

The calculated bubble surface velocity and acceleration at the collapse point for the bubble shown in Fig. 4

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Fig. 3

The bubble motion as a function of time along with the observed one. The bubble dynamics is described by the Keller–Kolodner equation for a gas (air) bubble in liquid (water) with an initial radius of 8.5 μm driven by an acoustic pressure amplitude of 1.075 bar, and a frequency of 26.5 kHz. The observed data were obtained by Löfstedt et al. [45] for a cavitating air bubble in liquid water.

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Fig. 4

Numerical radius versus time for a gas (argon) bubble with an initial radius of 13 μm driven by an acoustic pressure amplitude of 1.42 bar, and a frequency of 28.5 kHz in a sulfuric acid solution. The observed data were obtained originally by Flannigan et al. [46].

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Fig. 5

The gas temperature at the center of the air bubble as a function of time

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Fig. 6

Temperature distribution near the collapse point for the bubble shown in Fig. 3

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Fig. 7

The gas pressure at the center of the air bubble as a function of time with logarithmic vertical axis

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Fig. 8

Pressure distribution near the collapse point for the bubble shown in Fig. 3

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Fig. 9

Calculated bubble center temperature for argon bubble shown in Fig. 4 as a function of time

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Fig. 10

The gas pressure at the center of the argon bubble as a function of time with logarithmic vertical axis

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Fig. 11

The time dependent gas pressure and temperature at the center during the collapse phase for the bubble shown in Fig. 4

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