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Destructive Action of Shock Focusing-Induced Cavitation and Research on Its Suppression

Research Project

Project/Area Number 04650140
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field Fluid engineering
Research InstitutionHokkaido University of Education

Principal Investigator

TOMITA Yukio  Faculty of Education, Hokkaido University of Education ; Associate Professor, 教育学部・函館校, 助教授 (00006199)

Co-Investigator(Kenkyū-buntansha) TAKAYAMA Kazuyoshi  Institute of Fluid Science, Tohoku University ; Professor, 流体科学研究所, 教授 (40006193)
Project Period (FY) 1992 – 1993
Project Status Completed (Fiscal Year 1993)
Budget Amount *help
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1993: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1992: ¥1,400,000 (Direct Cost: ¥1,400,000)
KeywordsCavitation / Shock Wave / Bubble / Bubble Interaction / ESWL / Tissue Damage / Pressure Transducer / 気泡相互作用
Research Abstract

A detailed observation of shock focusing and induced cavitation phenomena was continiously carried out using a reflector which is one of the same type as that commercialized in Japan. We especially noticed the effect of the exit configuration of the reflector on the cavitation occurence at the 2nd focal point of the ellipsoidal reflector. As a result, it is suggested that cavitation is relatively suppressed in the case where the exit surface of the reflector changes not abruptly but gradually curved shape, resulting in weak focusing of expansion waves at the 2nd focal point. On the other hands, for the purpose of understanding complicated phenomena appearing at around 2nd focal point of the reflector several elementary researches have been conducted, such as shock wave/bubble interaction and bubble/bubble interaction. An experiment was also performed, in which a bubble attached on a gelatine wall was hit by a shock wave. Consequently a higher liquid microjet was formed, piercing into the gelatine layr. Furthermore the bubble/bubble interaction was examined using two bubbles generated by means of a laser. It was found that an individual bubble can take several modes of the bubble motion, depending on the bubble size, distance between two bubbles and time difference of bubble generations. When two bubbles are affecting each other, an interesting phenomena such as the jet formation with higher velocity, the bubble disintegration and the vortex ring formation, occurred. The most of results obtained are already reported at both national and international symposia, and also published in journals.

Report

(3 results)
  • 1993 Annual Research Report   Final Research Report Summary
  • 1992 Annual Research Report
  • Research Products

    (24 results)

All Other

All Publications (24 results)

  • [Publications] 冨田 幸雄: "衝撃波の作用によるガス気泡の変形挙動" 平成4年度衝撃波シンポジウム講演論文集. 257-260 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 冨田 幸雄: "平面剛体壁近傍での気泡の非球状運動に関する理論的ならびに実験的研究" 日本機械学会論文集(B編). 59-562. 1891-1899 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 冨田 幸雄: "水中における異るサイズの2個の気泡の相互作用" 日本機械学会流体工学部門講演会講演論文集. 930-49. 205-207 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Y.Tomita: "Interaction of Two Laser-Produced Cavitation Bubbles near Boundaries" Presented at the IUTAM Symposium on Bubble Dynamics and Interface Phenomena. (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] J.R.Blake: "Interaction of Two Cavitation Bubbles with a Rigid Boundary" Journal of Fluid Mechanics. 255. 707-721 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Y.Tomita: "Cavitation Phenomena in Extracorporeal Microexplosion Lithotripsy" Shock Waves-An International Journal-. 3. 149-157 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Y.Tomita, K.Yamada and K.Takayama: "Deformation of a Gas Bubble by a Shock Wave" Proceedings of the Shock Wave Symposium. 257-260 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Y.Tomita, K.Sato and A.Shima: "Theoretical and Experimental Investigation on the Nonspherical Motion of a Bubble near a Plane Rigid Wall" Trans.Jpn.Soc.Mech.Eng.(B). 59-562. 1891-1899 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Y.Tomita, K.Sato and A.Shima: "Mutual Interaction of Two Different Sized Bubbles in Water" Prepr.of Jan.Soc.Mech.Eng.930-49. 205-207 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Y.Tomita, K.Sato and A.Shima: "Interaction of Two Laser-produced Cavitation Bubbles near Boundaries" Presented at the IUTAM Symposium on Bubble Dynamics and Interface Phenomena. Sept.6-9 Birmingham. (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] J.R.Blake, P.B.Robinson, A.Shima and Y.Tomita: "Interaction of Two Cavitation Bubble with a Rigid Boundary" Journal of Fluid Mechanics. 255. 707-721 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Y.Tomita, T.Obara, K.Takayama and M.Kuwahara: "Cavitation Phenomena in Extracorporeal Microexplosion Lithotripsy" Shock Waves -An International Journal-. 3. 149-157 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 冨田 幸雄: "衝撃波の作用によるガス気泡の変形挙動" 平成4年度衝撃波シンポジウム講演論文集. 257-260 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 小玉 哲也: "ゼラチン壁に付着した気泡と衝撃波との相互干渉(気泡の崩壊と生体損傷に関する一考察)" 日本機械学会論文集(B編). 59-561. 3-7 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 冨田 幸雄: "平面剛体壁近傍での気泡の非球状運動に関する理論的ならびに実験的研究" 日本機械学会論文集(B編). 59-562. 117-125 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 冨田 幸雄: "水中における異るサイズの2個の気泡の相互作用" 日本機械学会流体工学部門講演会講演論文集. 930-49. 205-207 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] Y.Tomita: "Interaction of Two Laser-Produced Cavitation Bubbles near Boundaries" Presented at the IUTAM Symposium on Bubble Dynamics and Interface Phenomena. (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] J.R.Blake: "Interaction of Two Cavitation Bubbles with a Rigid Boundary" Journal of Fluid Mechanics. 255. 707-721 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 冨田 幸雄: "衝撃波フォーカッシングで誘起されるキャビテーション気泡と衝撃波との相互干渉" 平成3年度衝撃波シンポジウム講演論文集. 603-606 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 冨田 幸雄: "体外衝撃波結石砕砕術におけるキャビテーション効果に関する一考察" 日本産業技術教育学会北海道支部 研究論文集,第5号(1991年度). 81-87 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 冨田 幸雄: "位相差のある2個のレーザ生成気泡の相互作用" 日本機械学会関西支部 第67期定時総会講演会講演論文集. 924-2. 31-33 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] Tomita,Y.: "Non-Spherical Motion of Laser-Produced Cavitation Bubbles Near Boundaries" Proceedings of the 14th International Congress on Acoustics. 2. C2-2 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 冨田 幸雄: "変形壁近傍でのキャビテーションの気泡の挙動に関する実験的研究" 日本学術会議キャビテーションに関するシンポジウム(第7回). 93-98 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] Lush,P.A.: "Cavitation and Induced Shock Wave-Bubble Interaction As a Cause of Human Tissue Damage in Extracorporeal Shock Wave Lithotripsy" Proceedings of the 3rd International Symposium on Cavitation. 55-64 (1992)

    • Related Report
      1992 Annual Research Report

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Published: 1992-04-01   Modified: 2016-04-21  

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