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Successive fragmentation of droplets for efficient particle production

Research Project

Project/Area Number 19K21934
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 19:Fluid engineering, thermal engineering, and related fields
Research InstitutionKyushu University

Principal Investigator

Inoue Chihiro  九州大学, 工学研究院, 准教授 (70466788)

Project Period (FY) 2019-06-28 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥5,720,000 (Direct Cost: ¥4,400,000、Indirect Cost: ¥1,320,000)
Fiscal Year 2020: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2019: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Keywords液体金属 / 微粒子 / 液滴 / 分裂 / 表面張力 / 分子拡散 / 高速度可視化 / 温度計測 / 微粒化 / 連鎖
Outline of Research at the Start

従来の流体工学において、液滴は1回しか分裂しないと考えられていた。本研究は、金属液滴が自発的に10回も分裂を繰り返す、新しい現象である『液滴連鎖分裂』に着目する。本研究の目的は、『特異な分裂現象である液滴連鎖分裂の発生条件を特定すること』である。本研究を通じて、液滴連鎖分裂の発生条件を特定することで、従来よりもはるかに高効率な微粒子製造技術への展開が期待できる。本研究は、流体工学における独創的な取り組みであるとともに、革新的な微粒子製造技術への展開が期待できる点で、挑戦的研究としての価値を有する。

Outline of Final Research Achievements

For the efficient production of fine metal particles, we conducted research with the aim of evaluating the applicability to innovative particle production technology by identifying the conditions under which liquid metals successively fragment. First, using a high-speed camera, we clarified the behavior of metal particles that split while scattering and the quantitative temperature. Then, metal fine particles were collected and investigated in detail from a microscopic viewpoint using an electron microscope. As a result, we succeeded in obtaining the diameter of metal particles and the diameter of bubbles inside. Furthermore, by combining high-speed visualization and theoretical analysis, diffusion phenomenon inside the particles and generation of bubbles inside were found being important for chain splitting, and continuous condensed phase reaction at high temperature was necessary for fine particle production.

Academic Significance and Societal Importance of the Research Achievements

積層造形や粉末冶金に用いられる金属微粒子は,従来,高速の気体や水噴霧を溶融金属に衝突させて微粒化,冷却して製造する.このとき,個々の金属微粒子は1回しか分裂しないため,エネルギー効率が低い.この課題を解決するために,本研究では,液滴が繰り返し分裂する連鎖分裂現象を応用することを着想した.実験と理論解析を実施し,液体金属が連鎖的に分裂する条件を特定し,革新的な微粒子製造技術への適用性を評価した.

Report

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

    (26 results)

All 2021 2020 2019 Other

All Int'l Joint Research (2 results) Journal Article (8 results) (of which Peer Reviewed: 7 results,  Open Access: 7 results) Presentation (14 results) (of which Int'l Joint Research: 2 results,  Invited: 1 results) Remarks (2 results)

  • [Int'l Joint Research] Aix-Marseille University(フランス)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] Aix-Marseille University(フランス)

    • Related Report
      2019 Research-status Report
  • [Journal Article] Analysis on unsteady thermal behavior of ground iron sparks2021

    • Author(s)
      Taro KIMURA and Chihiro INOUE
    • Journal Title

      Science and Technology of Energetic Materials

      Volume: 82 Pages: 50-54

    • NAID

      130008037503

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Direct Formulation of Bipropellant Thruster Performance for Quantitative Cold-Flow Diagnostic2021

    • Author(s)
      Chihiro Inoue, Yuki Oishi, Yu Daimon, Go Fujii and Kaname Kawatsu
    • Journal Title

      Journal of Propulsion and Power

      Volume: 掲載確定

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Measurement and modeling of planar airblast spray flux distributions2021

    • Author(s)
      Chihiro Inoue, Hiroaki Yoshida, Junya Kouwa, Yuki Iwaki, Mitsunori Itoh
    • Journal Title

      International Journal of Multiphase Flow

      Volume: 137 Pages: 103580-103580

    • DOI

      10.1016/j.ijmultiphaseflow.2021.103580

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] On the droplet entrainment from gas-sheared liquid film2021

    • Author(s)
      Chihiro Inoue and Ikkan Maeda
    • Journal Title

      Physics of Fluids

      Volume: 33 Issue: 1 Pages: 011705-011705

    • DOI

      10.1063/5.0038399

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Senko-hanabi under various ambient conditions2020

    • Author(s)
      Chihiro INOUE, Ryo NISHIYAMA, Yasuhiro FUJISAKI, Toshiaki KITAGAWA
    • Journal Title

      Science and Technology of Energetic Materials

      Volume: 81 Issue: 5 Pages: 121-127

    • DOI

      10.34571/stem.81.5_121

    • NAID

      130007937412

    • ISSN
      0368-5977, 1347-9466, 2434-6322
    • Related Report
      2020 Annual Research Report 2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Proposal of Specific Impulse Prediction Method for Bipropellant Thruster2020

    • Author(s)
      Yuto TERAUCHI, Chihiro INOUE, Yu DAIMON and Go FUJII
    • Journal Title

      Trans. Japan Soc. Aero. Space Sci.

      Volume: -

    • NAID

      130007896319

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] 熱放射が魅せる線香花火の儚い色味2020

    • Author(s)
      井上智博
    • Journal Title

      日本鉄鋼協会会報誌

      Volume: 25 Pages: 196-199

    • Related Report
      2019 Research-status Report
  • [Journal Article] Heat Balance Characteristics of Senko-hanabi and Iron Sparks2019

    • Author(s)
      Chihiro INOUE,Taiki WATANABE,and Yuzo INOKUCHI
    • Journal Title

      Science and Technology of Energetic Materials

      Volume: 80 Pages: 136-141

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 軌跡計算による炭素鋼火花の分裂機構の検討2021

    • Author(s)
      木村 太郎,井上 智博
    • Organizer
      火薬学会春季発表会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 線香花火の火球表面における気泡破裂頻度解析2021

    • Author(s)
      渡辺 結起乃,伊里 友一朗, 井上 智博, 三宅 淳巳
    • Organizer
      火薬学会春季発表会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 凝縮相反応が駆動する新しい混相熱流動:液滴連鎖分裂2021

    • Author(s)
      井上 智博
    • Organizer
      北九州化学工学懇話会(KACE)第68回講演会
    • Related Report
      2020 Annual Research Report
    • Invited
  • [Presentation] 金属火花の二色温度計測と電子顕微鏡観察による分裂機構の検討2020

    • Author(s)
      木村 太郎,井上 智博
    • Organizer
      火薬学会春季発表会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 速度論解析を用いた線香花火の液滴分裂機構2020

    • Author(s)
      渡辺 結起乃,塩田 謙人,伊里 友一朗, 井上 智博, 三宅 淳巳
    • Organizer
      火薬学会春季発表会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Direct Formulation and Quantitative Water-Flow Diagnostic for Bi-Propellant Thruster Performance2020

    • Author(s)
      Chihiro Inoue, Yuki Oishi, Yuto Terauchi, Yu Daimon, Go Fujii and Kaname Kawatsu
    • Organizer
      AIAA Propulsion Energy Forum
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 高速赤外線カメラと軌跡計算を援用した純鉄火花の非定常温度解析2020

    • Author(s)
      木村 太郎,井上 智博
    • Organizer
      火薬学会秋季発表会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 熱分析による線香花火の気泡生成反応解析2020

    • Author(s)
      渡辺 結起乃,伊里 友一朗, 井上 智博, 三宅 淳巳
    • Organizer
      火薬学会秋季発表会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 炭素鋼火花の分岐機構に関する考察2020

    • Author(s)
      木村 太郎,井上 智博
    • Organizer
      第29回微粒化シンポジウム
    • Related Report
      2020 Annual Research Report
  • [Presentation] 金属火花の二色温度計測と電子顕微鏡観察による分裂機構の検討2020

    • Author(s)
      木村 太郎,井上 智博
    • Organizer
      火薬学会
    • Related Report
      2019 Research-status Report
  • [Presentation] 速度論解析を用いた線香花火の液滴分裂機構2020

    • Author(s)
      渡辺 結起乃,塩田 謙人,伊里 友一朗, 井上 智博, 三宅 淳巳
    • Organizer
      火薬学会
    • Related Report
      2019 Research-status Report
  • [Presentation] Fragile Coloration Mechanism of Traditional Japanese Sparkler, Senko-Hanabi2019

    • Author(s)
      Chihiro INOUE,Taiki WATANABE,and Yuzo INOKUCHI
    • Organizer
      17th International Symposium on Fireworks
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] 線香花火と金属火花の温度2019

    • Author(s)
      井上 智博,渡辺 大貴, 猪口 雄三
    • Organizer
      火薬学会
    • Related Report
      2019 Research-status Report
  • [Presentation] 線香花火と金属火花の二色温度計測に基づく熱収支2019

    • Author(s)
      井上 智博
    • Organizer
      高速度イメージングとフォトニクスに関する総合シンポジウム2019
    • Related Report
      2019 Research-status Report
  • [Remarks] 九州大学大学院航空宇宙工学部門推進工学研究室Webページ

    • URL

      https://aero.apl-kyushu.page

    • Related Report
      2020 Annual Research Report
  • [Remarks] 九州大学大学院航空宇宙工学部門推進工学研究室

    • URL

      http://www.aero.kyushu-u.ac.jp/apl/

    • Related Report
      2019 Research-status Report

URL: 

Published: 2019-07-04   Modified: 2022-01-27  

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