Dynamical behaviors of a bubble cluster under ultrasound field

Shen, Zhonghua; Sheng-Ju, Wu

doi:10.7498/aps.61.244301

Cited by 5 publications

(1 citation statement)

References 14 publications

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“…The possible reason is that the larger the number of cavitation bubbles with the fixed cluster radius, the greater the limitation of expansion and compression of the bubbles will be, which results in the delay of the collapse time of the bubbles and the temperature dropping inside each bubble. [54] Figures 4(b)-4(d) show the quantities of strong oxidants inside bubble for the three different numbers of cavitation bubbles (N = 500, N = 1000, and N = 3000), respectively. It can be seen from the three curves that the higher the number of the cavitation bubbles in cluster, the less the quantity of oxidants (such as free radicals) produced inside bubble is.…”

Section: Effect Of Number Of Cavitation Bubbles In Cluster On Strong ...mentioning

confidence: 99%

Theoretical estimation of sonochemical yield in bubble cluster in acoustic field*

Shen

2020

Chinese Phys. B

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In order to learn more about the physical phenomena occurring in cloud cavitation, the nonlinear dynamics of a spherical cluster of cavitation bubbles and cavitation bubbles in cluster in an acoustic field excited by a square pressure wave are numerically investigated by considering viscosity, surface tension, and the weak compressibility of the liquid. The theoretical prediction of the yield of oxidants produced inside bubbles during the strong collapse stage of cavitation bubbles is also investigated. The effects of acoustic frequency, acoustic pressure amplitude, and the number of bubbles in cluster on bubble temperature and the quantity of oxidants produced inside bubbles are analyzed. The results show that the change of acoustic frequency, acoustic pressure amplitude, and the number of bubbles in cluster have an effect not only on temperature and the quantity of oxidants inside the bubble, but also on the degradation types of pollutants, which provides a guidance in improving the sonochemical degradation of organic pollutants.

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Section: Effect Of Number Of Cavitation Bubbles In Cluster On Strong ...mentioning

confidence: 99%

Theoretical estimation of sonochemical yield in bubble cluster in acoustic field*

Shen

2020

Chinese Phys. B

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The effects of ultrasonic treatments on the microstructure and mechanical properties of SAC0307 solder

Chen

Lai

et al. 2019

Journal of Materials Processing Technology

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The microstructures and physical properties of SAC0307 lead-free solder formed by an ultrasound-assisted semi-solid casting process were analyzed. The damages to a thin aluminium foil placed in the alloy melt at 226 • C showed strong effects of acoustic streaming. Significant erosion due to cavitation was found for powers higher than 450W. Numerical simulations of a collapsing cavitation bubble obtained the highest peak pressure and temperature when the ultrasonic power was around 550W. When the ultrasonic power was between 500W and 600W, sub-grains were observed and the crystal grains became equiaxed with the smallest average grain size of about 140µm. The highest tensile strength found in this range was about 36.6 MPa. The density was 7.35g/cm 3. The elongation at break was about 60%, which was 40% higher than the value obtained by traditional casting techniques.

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Vibration of the bubble in bubbly liquids

Yong¹,

Lin²,

Mo³

et al. 2013

Acta Phys. Sin.

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The vibration of bubbles in bubbly liquids has been studied when the driving sound field is fixed. The radius of the bubble will change when the bubble is driven by a driving acoustic field for a short time. This small change of radius is then fed back to the scattering process of the bubbles driven by the driving acoustic field. Thus the compound acoustic field including the scattered field of the bubble can be obtained. Then the bubble is again driven into vibration for a short time. By repeating the same procedure, the bubble vibration and its radius variation are simulated by a numerical method. It is shown that in the case of numerous bubbles in the liquid the vibration of a bubble is different from the case of only a single bubble in it. Because numerous bubbles will show interactions between one another, the radius of the bubble will change in different manner. For different size and content of bubbles, the radius of the bubble changes according to the following rules. The radius will oscillate in the vicinity of the equilibrium position; the radius oscillation shows a periodic cavitation process; the radius will vibrate during one cycle of cavitation; then, the radius will increase and oscillate in the vicinity of a certain value. Therefore, it is necessary that the bubble content should be considered in analyzing the vibration of the bubble in a bubbly liquid under a driving sound field.

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Dynamical behaviors of a bubble cluster under ultrasound field

Cited by 5 publications

References 14 publications

Theoretical estimation of sonochemical yield in bubble cluster in acoustic field*

Theoretical estimation of sonochemical yield in bubble cluster in acoustic field*

The effects of ultrasonic treatments on the microstructure and mechanical properties of SAC0307 solder

Vibration of the bubble in bubbly liquids

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