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Large-scale MD analysis on generation process of size distribution of bubble nuclei

Research Project

Project/Area Number 16K06085
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Fluid engineering
Research InstitutionKyushu University

Principal Investigator

Tsuda Shinichi  九州大学, 工学研究院, 准教授 (00466244)

Research Collaborator WATANABE Satoshi  
Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2018: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2017: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2016: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Keywordsキャビテーション / 気泡核 / サイズ分布 / 時間スケーリング則 / 蒸発/凝縮 / 単成分系 / 二成分系 / 時間スケーリング / 多成分系 / 流体 / 分子動力学
Outline of Final Research Achievements

In the case of simple molecular fluids such as liquid argon or liquified air, we have found that a characteristic length of spontaneously generated bubble nuclei (mean diameter of nuclei) in such fluids under sufficiently low pressure condition is scaled by the square root of time independent of spacial scale. In addition, we have newly found that relatively larger bubble nuclei are limited by evaporation/condensation while the smaller nuclei is also affected by liquid inertia surrounding bubble nuclei.

Academic Significance and Societal Importance of the Research Achievements

非常に小さな空間領域において生じる気液の相変化過程を明らかにする学術的および社会的要請が高まってきている中,本研究では,少なくとも非常に単純な分子モデルで模擬できる流体の場合,空間領域の大きさによらず気泡核群の代表長さが時間の0.5乗に比例した変化を示すことが,単成分系の流体のみならず多成分系の流体においても示された.このことは,非常に小さな空間領域における気泡核のサイズ変化,ひいてはサイズ分布の状態が,これまでに知られているマクロなモデルでも十分説明できることを示しており,既往の知見が微小な空間領域にも概ね適用可能であることを示す大きな意義を有している.

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (10 results)

All 2019 2018 2017 Other

All Journal Article (1 results) (of which Open Access: 1 results) Presentation (6 results) (of which Int'l Joint Research: 2 results,  Invited: 1 results) Remarks (3 results)

  • [Journal Article] Molecular Dynamics Simulation of Nucleation-Growth and Collapse of Nano-Scale Bubble2018

    • Author(s)
      津田 伸一
    • Journal Title

      JAPANESE JOURNAL OF MULTIPHASE FLOW

      Volume: 32 Issue: 4 Pages: 400-407

    • DOI

      10.3811/jjmf.2018.T009

    • NAID

      130007543855

    • ISSN
      0914-2843, 1881-5790
    • Year and Date
      2018-12-15
    • Related Report
      2018 Annual Research Report
    • Open Access
  • [Presentation] 液体ロケット推進剤のキャビテーション現象に対するマルチスケールアプローチ2019

    • Author(s)
      津田 伸一
    • Organizer
      日本航空宇宙学会関西支部 第475回航空宇宙懇談会
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] Validation of Wagner theory on coarsening process of cavitation bubbles in oxygen-nitrogen mixture system by molecular dynamics simulation2018

    • Author(s)
      Yuta Nakano, Shin-ichi Tsuda, Satoshi Watanabe
    • Organizer
      71st Annual Meeting of the APS Division of Fluid Dynamics
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 微小気泡群の形成過程2018

    • Author(s)
      津田 伸一
    • Organizer
      第1回W-FST研究セミナー
    • Related Report
      2017 Research-status Report
  • [Presentation] 分子動力学シミュレーションによる微小気泡群の粗大化過程に対するWagner理論の妥当性検討2017

    • Author(s)
      中野 裕太,津田 伸一,渡邉 聡
    • Organizer
      日本機械学会2017年度年次大会
    • Related Report
      2017 Research-status Report
  • [Presentation] Molecular Dynamics Investigation of Each Bubble Behavior in Coarsening of Cavitation Bubbles in a Finite Space2017

    • Author(s)
      Yuta Nakano, Shin-ichi Tsuda, Satoshi Watanabe
    • Organizer
      70th Annual Meeting of the APS Division of Fluid Dynamics
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] 分子動力学シミュレーションによる微小気泡群の成長則の評価2017

    • Author(s)
      中野 裕太,津田 伸一,渡邉 聡
    • Organizer
      日本機械学会九州支部第70期総会・講演会
    • Place of Presentation
      佐賀大学本庄キャンパス
    • Related Report
      2016 Research-status Report
  • [Remarks] 九州大学 ‐ 研究者情報(津田 伸一)

    • URL

      http://hyoka.ofc.kyushu-u.ac.jp/search/details/K005500/research.html

    • Related Report
      2018 Annual Research Report
  • [Remarks] 九州大学‐研究者情報(津田 伸一)

    • URL

      http://hyoka.ofc.kyushu-u.ac.jp/search/details/K005500/

    • Related Report
      2017 Research-status Report
  • [Remarks] 九州大学‐研究者情報(津田 伸一)

    • URL

      http://hyoka.ofc.kyushu-u.ac.jp/search/details/K005500/research.html

    • Related Report
      2016 Research-status Report

URL: 

Published: 2016-04-21   Modified: 2020-03-30  

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