Broadband ultrasound-trapping barrier based on hollow cylinder with a periodic grating

We report that the transmission of incident ultrasonic waves through an impedance-mismatched brass plate can be drastically enhanced by single-sided periodic gratings. Using Schlieren imaging, we experimentally demonstrated the phenomenon of extraordinary acoustic transmission through the stiff, structured plate. Using a numerical model, we revealed that this phenomenon arises from the resonant excitation of the intrinsic A0 mode in this structure. We discussed the possible application of this structure as a patch to enhance ultrasound transmission in medical instruments.

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Enhancement of ultrasonic transmission using a patch patterned with single-sided periodic gratings

Zhou

Wei

Xue

et al. 2019

Journal of Applied Physics

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Morphological characteristics and cleaning effects of collapsing cavitation bubble in fractal cracks

Shan,

Zha,

Yang

et al. 2024

Physics of Fluids

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When a cavitation bubble collapses in a crack, due to the lack of symmetry, spatial uniformity, and obvious correlations during the collapse process, it is difficult to effectively explore the interaction mechanism between the bubble and crack walls. In this paper, a combination of numerical simulation and experimental approaches are used to explore the collapse process of a cavitation bubble in a fractal crack. The numerical model is based on the pseudopotential multi-relaxation-time lattice Boltzmann method (LBM). The experiment platform including an underwater pulsed discharge device combined with a high-speed camera system. Moreover, the morphological analysis method based on Minkowski functionals is used to quantitatively depict the morphological features in this paper. The validity of the numerical model is qualitatively verified by the experimental platform, whereas the influence of the complexity and geometric features of the crack wall on the cavitation bubble collapse process is quantitatively studied by LBM simulation and Minkowski functionals. The research findings indicate that the complexity and geometric features of the crack wall markedly influence the collapse time and behavior of the cavitation bubble. Specifically, the collapse time of the cavitation bubble increases with the increasing complexity of the crack wall. Moreover, the maximum jet direction of cavitation bubble toward the wall is closest to the cavitation bubble. Furthermore, as the fractal dimension increases, the intensity of the pressure wave and jet acting upon the crack wall increase while the radiation range decreases. Cavitation cleaning can be applied to arbitrary complex solid surfaces in various environments.

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Broadband ultrasound-trapping barrier based on hollow cylinder with a periodic grating

Cited by 2 publications

References 20 publications

Enhancement of ultrasonic transmission using a patch patterned with single-sided periodic gratings

Enhancement of ultrasonic transmission using a patch patterned with single-sided periodic gratings

Morphological characteristics and cleaning effects of collapsing cavitation bubble in fractal cracks

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