Dynamics and measurement of cavitation bubble

Chen, Weizhong; Liu, Yanan; amp, Huang Wei; Gào, Xīn

doi:10.1007/s11433-006-0385-8

Cited by 8 publications

(4 citation statements)

References 26 publications

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“…Standing plenty of bubbles with different diameters is a peculiarity of ship wakes. Propagation of sound wave varies in wakes with bubbles or bubble films which lead to the transmission complexity due to reflection, refraction, and scattering, and the nonlinear effect with relatively large energy flux density as well [10,11] . Propagation of sound in ship wake is showed in Figure 2 with consideration of no nonlinear effect of interaction between acoustic wave and bubbles.…”

Section: Feasibility Of Laplace Equationmentioning

confidence: 99%

Sound speed in bubble film of ship wakes

Zhang

Lin

Liu

et al. 2008

Sci. China Ser. G-Phys. Mech. Astron.

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As is distinct from general gas-liquid two-phase flow, a large number of bubbles with different diameters belong to ship wakes. Feasibility of Laplace equation, used to calculate wake sound speed (WSS), is confirmed based on differential postulation. Defect for calculating the adiabatic sound speed of gases in references is showed, and a concept of WSS is proposed clearly. A minimum WSS of 24.5 m/s is got when bubble ratio reads 0.5 according to the calculation when bubble dimension is less than that of resonance. Also a weak dependence of WSS on pressures is predicted. WSS from calculation corresponds with the experimental data of references well in high frequency domain, when the actual scale of bubbles is greater than the resonant scale.ship wake, bubble film, Laplace equation, resonant frequency, sound speed Due to propeller cavitation, wave fragmentation at the ocean surface, and a great deal of air trapped along the waterline, the appearance of a streak of foamy and churned water which contains lots of bubbles behind a ship under way, is known as the ship's wake. Wake photo of a small-sized ship taken under conditions of lake experiments is showed in Figure 1. A method for detecting, tracking, or identifying the ship which has produced the wake may be achieved based on the investigation of ship wakes. Special characteristics of acoustics, electromagnetism, optics, and thermology are of ship wakes [1] . Physical specialties and geometric structures of wakes are important information sources for tracking, identifying or locating the target. Larger bubbles float upward fast and break down soon while micro-bubbles live a long time for over ten minutes. These micro-bubbles will dissolve in water or break down with the increase of time [2,3] . Density and compressibility of air have Figure 1 Wake picture of a small-sized ship.

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Section: Feasibility Of Laplace Equationmentioning

confidence: 99%

Sound speed in bubble film of ship wakes

Zhang

Lin

Liu

et al. 2008

Sci. China Ser. G-Phys. Mech. Astron.

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“…[7,8] In the traditional acoustic measurement methods of bubble coefficients the sound attenuation and sound velocity dispersion of bubbles are mainly used as the characteristics of sound scattering. [9,10] The emitted sound wave will vibrate the bubbles and emits the sound energy outwards through the bubble layer. The relationship between the received acoustic data and the bubble distribution can be obtained to obtain the bubble distribution characteristics.…”

Section: Introductionmentioning

confidence: 99%

Inversion method of bubble size distribution based on acoustic nonlinear coefficient measurement*

et al. 2020

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Measurements of bubble size distribution require the understanding of the acoustic characteristics of the medium. The bubbles show highly nonlinear properties under finite amplitude acoustic excitation, so the acoustic fields from bubble population are easily observed at the second harmonics as well as at the fundamental frequency, which shows that the nonlinear coefficient increases obviously. The inversion method of bubble size distribution based on nonlinear acoustic effects can peel off the influence of complex environment and obtain the size distribution coefficient information of bubbles more accurately. The previous nonlinear inversion methods of bubble size distribution are mostly based on the nonlinear scattering cross-section characteristics of bubbles. However, the stability of inversion is not high enough. In this paper, we introduce a new acoustic inversion method for bubble size distribution, which is based on the nonlinear coefficients of bubble medium. Compared with other inversion methods based on linear or nonlinear scattering cross section, the inversion method based on nonlinear coefficients of bubble medium proposed in this paper shows good robustness in both simulation and experiment.

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“…[2][3][4] It is seen that bubbles and cavitation are closely connected and often both are discussed together. Most papers on cavitation contain insight into bubbles and their dynamics, [5,6] and point out bubble oscillations result in the radiation of acoustic waves.…”

Section: Introductionmentioning

confidence: 99%

Bubble nonlinear dynamics and stimulated scattering process

et al. 2016

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A complete understanding of the bubble dynamics is deemed necessary in order to achieve their full potential applications in industry and medicine. For this purpose it is first needed to expand our knowledge of a single bubble behavior under different possible conditions including the frequency and pressure variations of the sound field. In addition, stimulated scattering of sound on a bubble is a special effect in sound field, and its characteristics are associated with bubble oscillation mode. A bubble in liquid can be considered as a representative example of nonlinear dynamical system theory with its resonance, and its dynamics characteristics can be described by the Keller-Miksis equation. The nonlinear dynamics of an acoustically excited gas bubble in water is investigated by using theoretical and numerical analysis methods. Our results show its strongly nonlinear behavior with respect to the pressure amplitude and excitation frequency as the control parameters, and give an intuitive insight into stimulated sound scattering on a bubble. It is seen that the stimulated sound scattering is different from common dynamical behaviors, such as bifurcation and chaos, which is the result of the nonlinear resonance of a bubble under the excitation of a high amplitude acoustic sound wave essentially. The numerical analysis results show that the threshold of stimulated sound scattering is smaller than those of bifurcation and chaos in the common condition.

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Dynamics and measurement of cavitation bubble

Cited by 8 publications

References 26 publications

Sound speed in bubble film of ship wakes

Sound speed in bubble film of ship wakes

Inversion method of bubble size distribution based on acoustic nonlinear coefficient measurement*

Bubble nonlinear dynamics and stimulated scattering process

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