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Creation of a cluster of cavitation bubbles using diffusing droplets and its extension to sonoluminescence

Research Project

Project/Area Number 16560138
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Fluid engineering
Research InstitutionThe University of Electro-Communications

Principal Investigator

HAYASHI Shigeo  The University of Electro-Communications, Faculty of Electro-Communications, Professor, 電気通信学部, 教授 (60126357)

Co-Investigator(Kenkyū-buntansha) HATANAKA Shin-ichi  The University of Electro-Communications, Faculty of Electro-Communications, Assistant Professor, 電気通信学部, 助手 (40334578)
Project Period (FY) 2004 – 2006
Project Status Completed (Fiscal Year 2006)
Budget Amount *help
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 2006: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2005: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2004: ¥2,500,000 (Direct Cost: ¥2,500,000)
KeywordsAcoustic cavitation / Diffusion / Viscous drops / Concentrated salt solutions / Sulfuric acid / キャビテーション / 濃厚塩溶液 / Mie散乱 / 確率過程 / ソノルミネッセンス
Research Abstract

The purpose of the present research program is to investigate experimentally how a viscous droplet, injected into water, plays a role in creating many bubbles, which may eventually result in a single bubble. The process is complicated and difficult to manage, as noted by Naser Harba. More fundamental investigation has thus been carried out.
1)Hydrodynamical behavior of a viscous diffusing droplet.
First, with no ultrasound droplets of glycerol were let fall from a position 5 mm above the surface, but the droplets floated as long as its density was heavier than the solution by less than 0.02 g/cm^3. Diffusion may have helped to gain the buoyancy. Next, if ultrasound was applied, the droplets evaded the position where bubbles were otherwise trapped, suggesting that Naser Harba painstakingly observed those diffusing processes.
2)Analysis of light-scattering data and related subjects.
Mie-scattering data for multiple bubbles formed from an injected glycerol droplet were analyzed, with the assumption that bubbles obeyed the Rayleigh-Plesset equation. It turned out that the scattering data were affected by saturation due to light. Computer programs were developed for analysis of bubbles and drops and for jittering of pulses on the digital oscilloscope, which may mislead to false time-train signals.
3)Sonoluminescence from concentrated sulfuric acid.
Sulfuric acid is also viscous, and sonoluminescence from it was investigated at several frequencies.
4)Numerical simulation of Moire patterns for diffusing droplets
Moire patterns were produced for a distribution of refractive index, which might mimic droplets isotropically diffusing within water.

Report

(4 results)
  • 2006 Annual Research Report   Final Research Report Summary
  • 2005 Annual Research Report
  • 2004 Annual Research Report
  • Research Products

    (12 results)

All 2006 2005 2004

All Journal Article (11 results) Book (1 results)

  • [Journal Article] Sonoluminescing single bubble in concentrated aqueous alkaline halide solutions2006

    • Author(s)
      S.Hayashi, K.Nozaki, S.-I.Hatanaka
    • Journal Title

      Ultrasonics 44

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Annual Research Report 2006 Final Research Report Summary
  • [Journal Article] Multibubble sonoluminescence enhancement by fluid flow2006

    • Author(s)
      S.-I.Hatanaka, H.Mitome, K.Yasui, S.Hayashi
    • Journal Title

      Ultrasonics 44

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Annual Research Report 2006 Final Research Report Summary
  • [Journal Article] Exponential rule for light-scattering sizing of bubbles or drops2005

    • Author(s)
      S.Hayashi
    • Journal Title

      Japanese Journal of Applied Physics 44 (3A)

      Pages: 6785-6790

    • NAID

      130004766385

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Stochastic model for observation of pulsed signals on oscilloscope2005

    • Author(s)
      S.Hayashi, S.-I.Hatanaka
    • Journal Title

      Japanese Journal of Applied Physics 44 (12)

      Pages: 8708-8710

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Exponential rule for light-scattering sizing of bubbles or drops2005

    • Author(s)
      S.Hayashi
    • Journal Title

      Japanese Journal of Applied Physics 44(9A)

      Pages: 6785-6790

    • NAID

      130004766385

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Stochastic model for observation of pulsed signals on oscilloscope2005

    • Author(s)
      S.Hayashi, S.Hatanaka
    • Journal Title

      Japanese Journal of Applied Physics 44(12)

      Pages: 8708-8710

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Dynamics of single sonoluminescing bubble in concentrated aqueous alkaline halide solutions2004

    • Author(s)
      K.Nozaki, S.Hatanaka, S.Hayashi
    • Journal Title

      Japanese Journal of Applied Physics 43 (3A)

      Pages: 6481-6483

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Sonoluminescing bubbles from a diffusing glycerol droplet2004

    • Author(s)
      S.Hayashi, N.Harba
    • Journal Title

      Slow Dynamics in Complex Systems : 3^<rd> International Sympdosium

      Pages: 442-443

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Dynamics of single sonoluminescing bubble in concentrated aqueous alkaline halide solutions2004

    • Author(s)
      K.Nozaki, S.-I.Hatanaka, S.Hayashi
    • Journal Title

      Japanese Journal of Applied Physics 43 (3A)

      Pages: 6481-6483

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Sonoluminescing bubbles from a diffusing glycerol droplet2004

    • Author(s)
      S.Hayashi, N.Harba
    • Journal Title

      Slow Dynamics in Complex Systems : 3rd International Symposium

      Pages: 442-443

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary 2004 Annual Research Report
  • [Journal Article] Dynamics of single sonoluminescing bubble in concentrated aqueous alkaline halide solutions2004

    • Author(s)
      K.Nozaki, S.Hatanaka, S.Hayashi
    • Journal Title

      Japanese Journal of Applied Physics Vol.43(9A)

      Pages: 6481-6483

    • Related Report
      2004 Annual Research Report
  • [Book] 泡のエンジニアリング2005

    • Author(s)
      林 茂雄(分担執筆)
    • Total Pages
      18
    • Publisher
      テクノシステム
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary 2005 Annual Research Report

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Published: 2004-04-01   Modified: 2016-04-21  

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