Effect of annular focusing of ultrasound on rate of stone erosion using cavitation bubbles

Yura, Toshiya; Lafond, Maxime; Yoshizawa, Shin; Umemura, Shin Ichiro

doi:10.7567/jjap.57.07lb18

Cited by 2 publications

(2 citation statements)

References 27 publications

(34 reference statements)

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“…This agrees with the hypothesis made in the previous study on the dynamics of isolated, spherical bubble clouds (Maeda and Colonius, 2018a). Though the scattering and/or the shielding effects of bubble clouds excited by shock-and high-intensity focused ultrasound (HIFU) waves have been reported in both numerical and experimental studies (Maxwell et al, 2011;Pishchalnikov et al, 2006;Tanguay, 2004;Yura et al, 2018), to our knowledge, quantification of the effects based on direct comparisons of experiment and corresponding computational fluid dynamics simulation has not been previously made.…”

Section: Implications For Bwlsupporting

confidence: 89%

Energy shielding by cavitation bubble clouds in burst wave lithotripsy

Maeda

Maxwell

Colonius

et al. 2018

The Journal of the Acoustical Society of America

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Combined laboratory experiment and numerical simulation are conducted on bubble clouds nucleated on the surface of a model kidney stone to quantify the energy shielding of the stone caused by cavitation during burst wave lithotripsy (BWL). In the experiment, the bubble clouds are visualized and bubble-scattered acoustics are measured. In the simulation, a compressible, multi-component flow solver is used to capture complex interactions among cavitation bubbles, the stone, and the burst wave. Quantitative agreement is confirmed between results of the experiment and the simulation. In the simulation, a significant shielding of incident wave energy by the bubble clouds is quantified. The magnitude of shielding can reach up to 90% of the energy of the incoming burst wave that otherwise would be transmitted into the stone, suggesting a potential loss of efficacy of stone comminution. There is a strong correlation between the magnitude of the energy shielding and the amplitude of the bubble-scattered acoustics, independent of the initial size and the void fraction of the bubble cloud within a range addressed in the simulation. This correlation could provide for realtime monitoring of cavitation activity in BWL. V

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Section: Implications For Bwlsupporting

confidence: 89%

Energy shielding by cavitation bubble clouds in burst wave lithotripsy

Maeda

Maxwell

Colonius

et al. 2018

The Journal of the Acoustical Society of America

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“…36) High-amplitude ultrasonic waves are also utilized in medical treatments or surgery. 37) Manipulation of cells is another promising application of high-intensity ultrasound 38) in biomedical fields.…”

Section: Introductionmentioning

confidence: 99%

Evaluation methods for materials for power ultrasonic applications

Nakamura

2020

Jpn. J. Appl. Phys.

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This paper is focused on evaluation methods for materials at high amplitudes of ultrasonic vibrations. First, basic concepts on piezoelectric ultrasonic transducers utilized in power applications are introduced as well as horns and vibration converters. Second, an electrical equivalent circuit model of piezoelectric transducers is described. Then, a standard method to measure the output acoustic power of ultrasonic transducer is demonstrated. Third, the electromechanical coupling factor and quality factor are defined. The last half of this paper is dedicated to the transient method and quality factor measurement under high vibration strain. The quality factor and piezoelectric constant of piezoelectric ceramics are discussed as functions of vibration strain with the transient method. Next, an evaluation method for the quality factor of non-piezoelectric materials is proposed on the basis of the definition of quality factor. Ultrasonic characteristics of several metals and polymers are explored using the proposed method.

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Effect of annular focusing of ultrasound on rate of stone erosion using cavitation bubbles

Cited by 2 publications

References 27 publications

Energy shielding by cavitation bubble clouds in burst wave lithotripsy

Energy shielding by cavitation bubble clouds in burst wave lithotripsy

Evaluation methods for materials for power ultrasonic applications

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