Numerical Study on Mechanical Effects of Cavitation in High-intensity Focused Ultrasound

2019 Fiscal Year Final Research Report

• Project/Area Number: 17K06170
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Fluid engineering
• Research Institution: Nihon University
• Principal Investigator: OKITA Kohei 日本大学, 生産工学部, 准教授 (20401135)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Keywords: キャビテーション / 医用超音波 / 気泡力学

Outline of Final Research Achievements

Collapse of cavitation bubble clouds enhances the mechanical effects of cavitation on therapeutic ultrasound treatments. A software application was developed to clarify the spatial distribution as well as nonlinear behavior of cavitation bubble clouds in a focused ultrasound field. As the results, the effects of the heat and mass transfer through the bubble interface and the translation motion of bubbles on the distribution of the cavitation bubble cloud were clarified by the present numerical simulation. In addition, irradiation parameters of ultrasound for the safe and efficient cavitation-enhanced focused ultrasound treatment werer studied.

Free Research Field

流体工学

Academic Significance and Societal Importance of the Research Achievements

キャビテーション気泡の界面における熱・物質移動や気泡の並進運動といったミクロな物理現象や様々な物性が，マクロな集束超音波音場におけるキャビテーション気泡群の空間分布とその崩壊に与える影響に関する知見は，キャビテーションを援用した集束超音波治療の安全性の向上と高効率化において学術的に重要であり，本研究で開発されたソフトウェアアプリケーションは次世代の医用超音波技術の開発に貢献するものである．