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Temporal evolution and spatial distribution of acoustic cavitation structures (evolving complicated patterns with clear boundary) in a very thin liquid layer were investigated experimentally with high-speed photography. The inception and disappearance processes of cavitation bubble cloud are revealed that the metastable cavitaton structures formed in the thin liquid layer cause a long-term “memory...
A time-domain boundary element method and an electro-mechanical reciprocity relation are applied to model the ultrasonic pulse echo in a solid. Three different coupling boundary integral equations have been obtained respectively for the scatterer represented by void, liquid and solid. An exact model is presented for the ultrasonic transmission, scattering and reception.
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