Mechanism elucidation of acoustic cavitation bubble from measurements of polarity and sonoluminescence

2023 Fiscal Year Final Research Report

• Project/Area Number: 19K15452
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 29030:Applied condensed matter physics-related
• Research Institution: Japan Women's University
• Principal Investigator: LEE Hyang-Bok 日本女子大学, 理学部, 助教 (50836632)
• Project Period (FY): 2019-04-01 – 2024-03-31
• Keywords: 音響キャビテーション / ソノルミネセンス / 帯電

Outline of Final Research Achievements

We investigated, for the first time, the charge of a single-bubble sonoluminescence (SBSL bubble) that exhibits spatiotemporally stable light emission by applying an electric field to the SBSL bubble. The translation results of the SBSL bubble under an electric field suggests that it is positively charged. Also we measured the electric field effects on bubble expansion and contraction by a light scattering technique. The measurement results suggest that bubble oscillation can be controlled by applying an electric field. Furthermore, the amount of bubble translation under an electric field depended on the elapsed time of sonoluminescence, suggesting that the products generated inside the SBSL bubble affect the mechanism of bubble charging.

Free Research Field

超音波物理学

Academic Significance and Societal Importance of the Research Achievements

本研究はこれまで報告例がなかった音響キャビテーション気泡の電気的性質を実験的に明らかにした。また、電界印加によって気泡振動を制御できることがわかった。本研究によって音響キャビテーション気泡の新たな応用場への活用が期待できる。