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Cavitation occurs due to the reduction of local pressure in a liquid to below its vapor pressure, leading to vaporization. This process finds applications across a broad spectrum of fields, from mechanical engineering domains to biomedical engineering, alcohol fermentation, soil improvement, and bacteria sterilization. This study aims to deepen the understanding of the dynamics of micro jet during the bubble collapse attached to wall. It particularly focuses on the bubble formation and collapse processes induced by High-Intensity Focused Ultrasound (HIFU). Numerical analysis using an in-house code validated across various conditions in previous studies was conducted. Advanced numerical methodologies, including the Navier-Stokes equation based Homogeneous Mixture Model, were applied to the numerical analysis. This study successfully delineates the shape characteristics and the pressure increasing during bubble collapse, providing insights into the physical processes in non-invasive medical treatments through HIFU. This foundational research contributes to a deeper understanding of cavitation phenomena and its mechanical as well as biomedical applications.
Kang et al. (Sun,) studied this question.