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

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish
Pages (from-to)710-717
Number of pages8
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume75
Issue number752
DOIs
Publication statusPublished - 2009 Apr

Keywords

  • Bubble
  • Cavitation
  • Medical ultrasound
  • Micro bubble
  • Rectified diffusion

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering

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