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Revealing the dynamics of a bubble in acoustic cavitation

Research Project

Project/Area Number 19K15000
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 21030:Measurement engineering-related
Research Institution防衛大学校(総合教育学群、人文社会科学群、応用科学群、電気情報学群及びシステム工学群) (2021)
Gifu National College of Technology (2019-2020)

Principal Investigator

Kuroyama Takanobu  防衛大学校(総合教育学群、人文社会科学群、応用科学群、電気情報学群及びシステム工学群), 応用科学群, 講師 (40781737)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2021: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2020: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2019: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywords音響キャビテーション / 気泡ダイナミクス / レーザ散乱 / 超音波ホーン / 強力超音波
Outline of Research at the Start

強力超音波によって発生する音響キャビテーションと呼ばれる微細な多数の気泡の半径振動態様を明らかにするために,新たな光学計測手法を確立し多数の気泡うち一つ一つの振動計測を行う.気泡1個が存在する程度の計測体積からのレーザ散乱光を測定できる光学系と,計測体積を通過する多数の気泡一つ一つによる散乱光強度波形を大量に取得可能な高速信号処理系を構築し,大規模一気泡振動計測を実現する.その結果と,これまで音響キャビテーション化学・物理的作用の評価指標とされてきたマクロなパラメータを比較し,音響キャビテーション固有の作用がどのような半径振動をする気泡が何個存在することによって生じているかを定量的に解明する.

Outline of Final Research Achievements

The purpose of this study is to clarify the oscillation of acoustic cavitation bubbles generated in liquid by ultrasound. An optical system for measurement of the bubble oscillation was constructed. This system measures the bubble oscillation from the intensity change of scattered light generated by irradiating a laser beam onto the bubbles. We measured bubbles generated under an ultrasonic horn using the system. The results show that there are bubbles near the horn that exhibit vibrations similar to those of a single bubble, and the number of such bubbles decreases as the distance from the horn increases. It is also found that at all positions in the vicinity of the horn, a large percentage of the bubbles oscillate differently from single bubble.

Academic Significance and Societal Importance of the Research Achievements

本研究では音響キャビテーション中の気の一つ一つの振動を計測する手法を確立した.計測結果は機械学習の手法を用いて解析を行うことが容易であり,これまで解析が困難であった気泡振動のばらつきの評価を可能とする.また本手法により得られた計測結果は,化学汚染物質除去等の音響キャビテーションの応用研究を進める上で重要な知見を与えるものである.

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (15 results)

All 2021 2020 2019

All Journal Article (3 results) (of which Peer Reviewed: 2 results,  Open Access: 1 results) Presentation (12 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] 超音波ホーン下に生じた音響キャビテーション気泡の振動2021

    • Author(s)
      黒山 喬允
    • Journal Title

      超音波テクノ

      Volume: 34 Pages: 00-00

    • Related Report
      2021 Annual Research Report
  • [Journal Article] Number density of bubbles under ultrasonic horn measured from stroboscopic images2021

    • Author(s)
      Kuroyama Takanobu
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 60 Issue: SD Pages: SDDD03-SDDD03

    • DOI

      10.35848/1347-4065/abe99c

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Spatial distribution measurement of acoustic cavitation bubbles by laser backscattering with confocal optics2019

    • Author(s)
      Takanobu Kuroyama
    • Journal Title

      Acoustical Science and Technology

      Volume: 40 Issue: 4 Pages: 279-282

    • DOI

      10.1250/ast.40.279

    • NAID

      130007672209

    • ISSN
      0369-4232, 1346-3969, 1347-5177
    • Year and Date
      2019-07-01
    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] トップハットビームを用いるレーザ散乱による音響キャビテーション気泡振動の計測2021

    • Author(s)
      古田 雄大, 黒山 喬允
    • Organizer
      日本音響学会2021年秋季研究発表会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 形成直後のシングルバブル半径振動の時間変化2021

    • Author(s)
      高橋 亮輔, 黒山 喬允
    • Organizer
      日本音響学会2021年秋季研究発表会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Initial growth and subsequent unstable oscillation of single bubble2021

    • Author(s)
      Takanobu Kuroyama
    • Organizer
      The 42nd symposium on ultrasonic electronics
    • Related Report
      2021 Annual Research Report
  • [Presentation] Laser diffraction caused by shockwaves from acoustic cavitation bubbles2021

    • Author(s)
      Fumitaka Yokoyama, Takanobu Kuroyama, Naoto Wakatsuki, Tadashi Ebihara, and Koichi Mizutani
    • Organizer
      The 42nd symposium on ultrasonic electronics
    • Related Report
      2021 Annual Research Report
  • [Presentation] Stroboscopic imaging to determine number density of acoustic cavitation bubbles2020

    • Author(s)
      Takanobu Kuriyama
    • Organizer
      The 41st symposium on ultrasonic electronics (USE2020)
    • Related Report
      2020 Research-status Report
  • [Presentation] Light scattering observation of oscillation of a bubble in acoustic cavitation cloud2019

    • Author(s)
      Takanobu Kuroyama
    • Organizer
      23rd International Congress on Acoustics (ICA2019)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Classification of radial oscillation characteristics of acoustic cavitation bubbles measured by laser scattering method2019

    • Author(s)
      Takanobu Kuroyama
    • Organizer
      The 40th symposium on ultrasonic electronics (USE2019)
    • Related Report
      2019 Research-status Report
  • [Presentation] Transient characteristics of acoustic cavitation noise after starting ultrasound irradiation2019

    • Author(s)
      Fumitaka Yokoyama and Takanobu Kuroyama
    • Organizer
      The 40th symposium on ultrasonic electronics (USE2019)
    • Related Report
      2019 Research-status Report
  • [Presentation] 超音波ホーン下に生じた音響キャビテーション気泡の分数調波振動2019

    • Author(s)
      黒山 喬允
    • Organizer
      日本音響学会 2019年秋季研究発表会
    • Related Report
      2019 Research-status Report
  • [Presentation] 音響キャビテーションノイズと気泡によるレーザ後方散乱波形の比較2019

    • Author(s)
      大野 喬史, 黒山 喬允
    • Organizer
      日本音響学会 2019年秋季研究発表会
    • Related Report
      2019 Research-status Report
  • [Presentation] レーザ透過法による単一気泡振動のシングルショット計測2019

    • Author(s)
      北川 雅千弥, 黒山 喬允
    • Organizer
      日本音響学会 2019年秋季研究発表会
    • Related Report
      2019 Research-status Report
  • [Presentation] 流れに伴う超音波ホーンによる音響キャビテーションノイズの変化2019

    • Author(s)
      横山 史高, 黒山 喬允
    • Organizer
      日本音響学会 2019年秋季研究発表会
    • Related Report
      2019 Research-status Report

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Published: 2019-04-18   Modified: 2023-01-30  

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