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3D thermal/flow measurement for active control of internal flows in drops

Research Project

Project/Area Number 20K14667
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 19020:Thermal engineering-related
Research InstitutionKyushu University

Principal Investigator

Kita Yutaku  九州大学, 工学研究院, 助教 (40840616)

Project Period (FY) 2020-04-01 – 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: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2020: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Keywords液滴 / マランゴニ対流 / 流れ可視化 / 蒸発 / 赤外線サーモグラフィ / 接触角 / マイクロ流体 / PIV
Outline of Research at the Start

医療分析や創薬研究への応用が期待される次世代マイクロ流体技術として,液滴を用いたデジタル流体デバイスが注目されている.ここで試料の混合・反応・検出を行うマイクロリアクタとしての役割を担う液滴の内部攪拌・温度制御技術の確立に向けて,本研究では,局所加熱された液滴の熱流動現象の理解を目指す.感温粒子画像流速測定により,温度場・速度場情報を同時取得することで,与えられた加熱量・温度が液滴内部対流の流速や温度上昇に及ぼす影響を明らかにする.また,液滴形状(接触角や体積)が熱対流の安定性に及ぼす影響を調査する.

Outline of Final Research Achievements

Heat transfer and fluid dynamics of locally-heated drops have been investigated with an aim to develop drop-base microreactors for lab-on-a-chip devices. Drops can be heated either with a laser or microheaters. Surface tension gradients would be formed due to the artificial thermal gradients produced by localized heating, and then, the surface tension gradients would drive the flows within the drop, Criteria for the onset of the flows and parameters that determines the flow have been identified. Moreover, the evaporation of "neighbouring" drops has been studied, which is usually the case in most applications. Background-oriented Schlieren technique has been used to quantify the vapour concentration field between drops and the interaction between them.

Academic Significance and Societal Importance of the Research Achievements

本研究は液滴の新規機能創出を目指した基礎現象の解明を目指すものである。液滴は一見単純な系に思われるが、実際は蒸発現象、濡れ現象、伝熱および流動現象など数々の現象が複合的に起こる複雑な系である。これまでにもスプレー冷却やインクジェット印刷、コーティング技術において液滴は基礎的な要素として用いられてきたが、これらは基本的に前述の諸現象の自発的な結果を応用したものである。一方で、本研究ではこれらの現象を能動的に制御しようとするものであり、得られた知見は学術的に価値が高く、液滴を利用した新技術の創出に大きく貢献するものである。

Report

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

    (18 results)

All 2022 2021 2020 Other

All Int'l Joint Research (3 results) Journal Article (4 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 3 results,  Open Access: 2 results) Presentation (11 results) (of which Int'l Joint Research: 6 results,  Invited: 5 results)

  • [Int'l Joint Research] エディンバラ大学(英国)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] エディンバラ大学(英国)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] ユニバーシティカレッジダブリン(アイルランド)

    • Related Report
      2020 Research-status Report
  • [Journal Article] Quenching mechanism of spray cooling and the effect of system pressure2022

    • Author(s)
      Kita Yutaku、Nakamatsu Mikiya、Hidaka Sumitomo、Kohno Masamichi、Takata Yasuyuki
    • Journal Title

      International Journal of Heat and Mass Transfer

      Volume: 190 Pages: 122795-122795

    • DOI

      10.1016/j.ijheatmasstransfer.2022.122795

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] 液滴蒸発と熱流動現象:赤外線カメラによるアプローチ2022

    • Author(s)
      喜多由拓
    • Journal Title

      可視化情報

      Volume: 42 Pages: 7-10

    • Related Report
      2021 Annual Research Report
  • [Journal Article] Coupled Water and Ethanol Vapour Transfer to and from Volatile Ethanol Drops in Humid Air: Diffusion Model Revisited2021

    • Author(s)
      Kita Yutaku、Orejon Daniel、Takata Yasuyuki、Sefiane Khellil
    • Journal Title

      Advances in Heat Transfer and Thermal Engineering

      Volume: 1 Pages: 111-114

    • DOI

      10.1007/978-981-33-4765-6_20

    • ISBN
      9789813347649, 9789813347656
    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] On the onset of quench during spray cooling: The significance of oxide layers2020

    • Author(s)
      Tsukamoto Kengo、Kita Yutaku、Inoue Shinya、Hamanosono Takafumi、Hidaka Sumitomo、Ueoka Satoshi、Fukuda Hiroyuki、Kohno Masamichi、Takata Yasuyuki
    • Journal Title

      Applied Thermal Engineering

      Volume: 179 Pages: 115682-115682

    • DOI

      10.1016/j.applthermaleng.2020.115682

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Stability of evaporating sessile drops comprising binary mixtures2022

    • Author(s)
      Katie Thomson, Adam Williams, George Karapetsas, Omar Matar, Yutaku Kita, Khellil Sefiane, Prashant Valluri
    • Organizer
      The 17th UK Heat Transfer Conference
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] スプレー冷却の急冷開始点に及ぼす雰囲気圧力の影響2021

    • Author(s)
      木田健介, 喜多由拓, 仲松幹弥, 日高澄具, 河野正道, 高田保之
    • Organizer
      日本機械学会熱工学コンファレンス2021
    • Related Report
      2021 Annual Research Report
  • [Presentation] Investigation of quenching points in spray cooling of a hot surface2021

    • Author(s)
      Masamichi Kohno, Yutaku Kita, Kensuke Kida, Mikiya Nakamatsu, Sumitomo Hidaka, Yasuyuki Takata
    • Organizer
      The Second Asian Conference on Thermal Sciences
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Quantifying vapour field around evaporating sessile drops using background-oriented schlieren technique2021

    • Author(s)
      Yutaku Kita, Anushka Kapoor, Khellil Sefiane, Yasuyuki Takata
    • Organizer
      Droplets 2021
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 高温面のスプレー冷却における急冷開始点の決定因子に関する研究2021

    • Author(s)
      河野正道, 仲松幹弥, 喜多由拓, 日高澄具, 高田保之
    • Organizer
      第58回 日本伝熱シンポジウム
    • Related Report
      2021 Annual Research Report
  • [Presentation] 隣接液滴の相互作用による蒸発挙動への影響:蒸気密度可視化による検討2021

    • Author(s)
      喜多由拓, Kapoor Anushka, Sefiane Khellil, 高田保之
    • Organizer
      第58回 日本伝熱シンポジウム
    • Related Report
      2021 Annual Research Report
  • [Presentation] Quenching Mechanisms of Spray Cooling - from Single Droplet to Spray Level2021

    • Author(s)
      Yutaku Kita
    • Organizer
      Thermal Transport Cafe Virtual Seminar
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Quench mechanisms of spray cooling - from single droplet to spray level2021

    • Author(s)
      Yutaku Kita
    • Organizer
      Thermal Transport Cafe
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 微小液滴の蒸発と不安定熱流動現象について2020

    • Author(s)
      喜多由拓
    • Organizer
      第6回相変化界面研究会
    • Related Report
      2020 Research-status Report
    • Invited
  • [Presentation] When does hot steel get quenched by sprayed water? - The influence of oxide layers on the onset of quenching2020

    • Author(s)
      Yutaku Kita
    • Organizer
      Sino-Japan-UK Frontiers in Phase Change Heat Transfer and Its Application in Energy
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 赤外線サーモグラフィによる微小液滴の気液相変化と熱流動現象へのアプローチ2020

    • Author(s)
      喜多由拓
    • Organizer
      第48回可視化情報シンポジウム
    • Related Report
      2020 Research-status Report
    • Invited

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Published: 2020-04-28   Modified: 2023-01-30  

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