Growth of an oscillating microbubble in an ultrasound field (Enhancement of rectified diffusion with a dual-frequency excitation method)

Shin Yoshizawa, Shu Takagi, Yoichiro Matsumoto

研究成果: Article査読

抄録

Acoustic cavitation has an important role in ultrasound applications, such as HIFU (High Intensity Focused Ultrasound) therapy. Control of the growth of the cavitation bubbles is one of the important factors to control the effects of the cavitating bubbles. Several researchers have shown that a dual-frequency excitation method can enhance the growth of the bubbles due to rectified diffusion and consequently enhances the effects of the cavitation. In this study, the growth of an oscillating bubble in an ultrasound field due to the rectified diffusion is numerically investigated. In the model, we consider the compressibility of the surrounding liquid, mist generation inside the bubble, and the heat and mass transfer through the bubble interface. Mass transfer is calculated by solving the gas diffusion equation in liquid phase with the boundary condition at the bubble interface. The results reveal that the dual frequency excitation method can enhance the rectified diffusion in certain cases and it can be useful to control the growth of the cavitating bubbles.

本文言語English
ページ(範囲)710-717
ページ数8
ジャーナルNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
75
752
DOI
出版ステータスPublished - 2009 4

ASJC Scopus subject areas

  • 凝縮系物理学
  • 機械工学

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