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Formation of polygonal vortex ring caused by interfacial instability

Research Project

Project/Area Number 18K03572
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 13040:Biophysics, chemical physics and soft matter physics-related
Research InstitutionNara Women's University (2023)
Fukuoka Institute of Technology (2018-2022)

Principal Investigator

Shimokawa Michiko  奈良女子大学, 自然科学系, 准教授 (80554419)

Co-Investigator(Kenkyū-buntansha) 坂口 英継  九州大学, 総合理工学研究院, 准教授 (90192591)
Project Period (FY) 2018-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2020: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2019: ¥260,000 (Direct Cost: ¥200,000、Indirect Cost: ¥60,000)
Fiscal Year 2018: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Keywords渦輪 / 界面不安定 / 重力不安定 / 不安定性 / モードセレクション / パターン形成 / 界面不安定性 / 実効粘度 / 不安定化 / 界面 / 液滴の変形
Outline of Final Research Achievements

A falling droplet breaks up into several droplets, after the droplet spontaneously deforms into a vortex ring as it falls in a viscous fluid. Although this phenomenon has been known for more than 100 years, its dynamics have not been well understood because it is an unsteady system in which the droplet shape and settling velocity change with time. We, therefore, proposed to understand its dynamics by studying of the vortex ring instability that causes the droplet to break up.
During the period of this project, we have identified the physical quantities to determine a number of a breakup of a droplet. In addition, we have proposed a new phenomenological model to include the effect of the vortex ring instability, and we have considered the dynamics by comparing our experimental results with those obtained from the model.

Academic Significance and Societal Importance of the Research Achievements

本研究は外力により駆動する液滴の分裂現象に着目した基礎研究である。液滴の分裂現象はプリンターの印刷技術の向上や自動車のエンジンの発火効率の上昇など工学技術の発展を考えるうえで重要な基礎研究であるといえる。そのため,本研究で得られた知見を発展させることで工学的応用が期待される。

Report

(7 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (30 results)

All 2024 2023 2022 2021 2020 2019 2018

All Journal Article (6 results) (of which Peer Reviewed: 5 results,  Open Access: 1 results) Presentation (24 results) (of which Int'l Joint Research: 6 results,  Invited: 4 results)

  • [Journal Article] Transition of the Bifurcations in the Rotation of a Camphor-Coated Elliptical Paper Disk2024

    • Author(s)
      Shimokawa Michiko、Arimitsu Junma、Kitahata Hiroyuki、Sakaguchi Hidetsugu
    • Journal Title

      Journal of the Physical Society of Japan

      Volume: 93 Issue: 3 Pages: 034002-034002

    • DOI

      10.7566/jpsj.93.034002

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Hula-Hoop-Like Motion and Subcritical Bifurcation of the Rotation of an Elliptical Paper Disk Coated with Camphor2022

    • Author(s)
      Michiko Shimokawa, Hidetsugu Sakaguchi
    • Journal Title

      J. Phys. Soc. Jpn. 91

      Volume: 91 Pages: 074002-074002

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Pattern Formation in Glass Caused by Rayleigh-Taylor Instability2020

    • Author(s)
      下川倫子
    • Journal Title

      JAPANESE JOURNAL OF MULTIPHASE FLOW

      Volume: 34 Issue: 3 Pages: 411-418

    • DOI

      10.3811/jjmf.2020.T013

    • NAID

      130007924679

    • ISSN
      0914-2843, 1881-5790
    • Year and Date
      2020-09-15
    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Star-shaped patterns caused by colloidal aggregation during the spreading process of a droplet2020

    • Author(s)
      Michiko Shimokawa, H. Kitahata and Hidetsugu Sakaguchi
    • Journal Title

      EPL (Europhysics Letters)

      Volume: 132 Issue: 1 Pages: 18002-18002

    • DOI

      10.1209/0295-5075/132/18002

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Mode selection on breakup of a droplet falling into a miscible solution2018

    • Author(s)
      Michiko Shimokawa and Hidetsugu Sakaguchi
    • Journal Title

      Physical Review Fluids

      Volume: 4 Issue: 1 Pages: 013603-013603

    • DOI

      10.1103/physrevfluids.4.013603

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] 自然がつくるラテ・アート2018

    • Author(s)
      下川倫子
    • Journal Title

      混相流

      Volume: 32

    • Related Report
      2018 Research-status Report
  • [Presentation] Bifurcation of Rotational Motion of Elliptical Camphor Coated Disk2024

    • Author(s)
      Michiko Shimokawa
    • Organizer
      Active Matter Workshop 2024
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] コーヒーカップの中のパターン形成2023

    • Author(s)
      下川倫子
    • Organizer
      溶液化学若手の会第3回冬季発表会
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] 楕円型樟脳粒の回転運動における分岐タイプのパラメータ依存性2023

    • Author(s)
      有光潤真, 下川倫子, 坂口英継, 北畑裕之
    • Organizer
      日本物理学会第28回年次大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 樟脳船の回転運動で生じる速度の振動現象2023

    • Author(s)
      下川倫子, 北畑裕之
    • Organizer
      日本物理学会第28回年次大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Bifurcation of rotational motion observed in experiments of elliptical camphor-coated disk2023

    • Author(s)
      Michiko Shimokawa, Junma Arimitsu, Hiroyuki Kitahata, Hidetsugu Sakaguchi
    • Organizer
      XLIII Dynamics Days Europe
    • Related Report
      2023 Annual Research Report
  • [Presentation] 楕円樟脳の回転運動に見られる分岐現象2022

    • Author(s)
      下川倫子, 有光潤真, 大河内魁人, 松永蓮矢, 坂口英継
    • Organizer
      日本物理学会第77回年次大会
    • Related Report
      2021 Research-status Report
  • [Presentation] Star shaped pattern caused by colloidal aggregation during spreading of the acidic solution on the surface of milk solutions2021

    • Author(s)
      Michiko Shimokawa, Hiroyuki Kitahata and Hidetsugu Sakaguchi
    • Organizer
      pacifichem2021
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] 楕円ろ紙樟脳の回転運動に見られる分岐現象2021

    • Author(s)
      下川倫子, 坂口英継
    • Organizer
      日本物理学会2021年秋季大会
    • Related Report
      2021 Research-status Report
  • [Presentation] ペースト乾燥破壊における羽毛パターン形成の一考察2021

    • Author(s)
      山田一希, 坂口英継, 下川倫子
    • Organizer
      日本物理学会2021年秋季大会
    • Related Report
      2021 Research-status Report
  • [Presentation] Formation of star shaped pattern caused by colloidal aggregation2020

    • Author(s)
      Michiko Shimokawa, Hiroyuki Kitahata and Hidetsugu Sakaguchi
    • Organizer
      Daynamics days digital 2020
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] 対流構造が作るフラクタルパターンーミルクコーヒーから考える地球科学ー2020

    • Author(s)
      下川倫子
    • Organizer
      日本地球科学惑星連合(JPGU)
    • Related Report
      2020 Research-status Report
  • [Presentation] 慣性領域における高速撥水のダイナミクス2020

    • Author(s)
      下川倫子、工藤和恵
    • Organizer
      日本物理学会
    • Related Report
      2020 Research-status Report
  • [Presentation] Breakup of falling droplets by instability of vortex ring2019

    • Author(s)
      Michiko Shimokawa and Hidetsugu Sakaguchi.
    • Organizer
      XXXIX Daynamics days Europe (DDEU 2019)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] コロイド凝集により形成される星形パターン2019

    • Author(s)
      下川倫子
    • Organizer
      第3回キッチン地球科学研究集会
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] コロイド凝集による星形パターンの形成2019

    • Author(s)
      下川倫子, 北畑裕之, 坂口英継
    • Organizer
      日本物理学会
    • Related Report
      2019 Research-status Report
  • [Presentation] ガラス基板上での撥水現象が示すべき乗則2019

    • Author(s)
      下川倫子
    • Organizer
      研究会「第6回非線形現象の捉え方」
    • Related Report
      2019 Research-status Report
  • [Presentation] Mode Selection of Breakup of Falling Droplet in Miscible Solution2019

    • Author(s)
      Michiko Shimokawa
    • Organizer
      Discussion meeting on Granular dynamics & Planetary terrain
    • Related Report
      2019 Research-status Report
  • [Presentation] 成長する渦輪の不安定モード2019

    • Author(s)
      下川倫子、坂口英継
    • Organizer
      第13回自己組織化討論会
    • Related Report
      2019 Research-status Report
  • [Presentation] Mode selection of Breakup of Falling Droplet in Miscible solution2019

    • Author(s)
      Michiko Shimokawa and Hidetsugu Sakaguchi.
    • Organizer
      BIT’s Annual World Congress of Smart Materials 2019
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] 沈降する液滴の分裂個数の決定2019

    • Author(s)
      下川倫子,坂口英継
    • Organizer
      日本物理学会第74回年次大会
    • Related Report
      2018 Research-status Report
  • [Presentation] 沈降する液滴の分裂現象2018

    • Author(s)
      下川倫子
    • Organizer
      第2回キッチン地球科学研究集会
    • Related Report
      2018 Research-status Report
    • Invited
  • [Presentation] Mode selection of the breakup of a droplet falling into a miscible solution2018

    • Author(s)
      Michiko Shimokawa and Hidestugu Sakaguchi.
    • Organizer
      International conference on Advances in Physics of Emergent orders in Fluctuations
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Mode selection on the breakup of a falling droplet in a miscible solution2018

    • Author(s)
      Michiko Shimokawa and Hidetsugu Sakaguchi
    • Organizer
      Gordon Research Seminar ―Oscillations and Dynamic Instabilities in Chemical Systems―
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] 界面不安定性による星形パターンの形成機構2018

    • Author(s)
      田中光貴,下川倫子,北畑裕之,坂口英継
    • Organizer
      第124回日本物理学会 九州支部会
    • Related Report
      2018 Research-status Report

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Published: 2018-04-23   Modified: 2025-01-30  

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