• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Cooperative effect of diffusion and convection

Research Project

Project/Area Number 20K14370
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 13010:Mathematical physics and fundamental theory of condensed matter physics-related
Research InstitutionKobe University (2021-2023)
Tohoku University (2020)

Principal Investigator

Koyano Yuki  神戸大学, 人間発達環境学研究科, 助教 (50849643)

Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2023: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2022: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2021: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2020: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords移流拡散方程式 / フォッカー・プランク方程式 / 移流 / 拡散 / 異常拡散 / フォッカープランク方程式 / ランジュバン方程式 / 流体力学 / 流体 / 音響浮遊法
Outline of Research at the Start

二流体を混合する上で、マクロなスケールでは流速場による撹拌が、ミクロなスケールでは熱的な揺動による物質拡散が重要なダイナミクスだと考えられてきたが、近年になって撹拌能力のない流速場が拡散を促進する現象が発見された。ミクロなスケールでは流体の混合において拡散が重要なダイナミクスである。そのため、この現象はミクロなスケールで工業的な技術として確立することが期待されている。これまで、限られた条件の下でのみ、流体場と拡散ダイナミクスの協働により拡散促進現象が起きることが理論的に説明された。そこで本研究では、流速場と物質拡散の協働現象について、系の詳細によらない基礎的かつ本質的な知見を探る。

Outline of Final Research Achievements

Convection and diffusion are fundamental processes in regard to fluid mixing. The two dynamics, convection and diffusion, usually have different spatial and temporal scales, and thus they can be considered separately.
However, it has been revealed by the experiments that the cooperative effect of convection and diffusion can cause nontrivial diffusion enhancement.
In this study, such cooperative effects were precisely investigated. We numerically found that anisotropic diffusion and net shift as well as diffusion enhancement were observed under a reciprocal flow. Such anomalous diffusion and convection were theoretically explained by the discrete Fokker-Planck equation of the Langevin dynamics.

Academic Significance and Societal Importance of the Research Achievements

移流と拡散が協働する現象はサブミリメートル以下のスケールで重要だと考えられる。近年、浮遊させた液滴を変形・合体させる技術や、マイクロ流路内での溶液混合など、ミクロなスケールで流体を操作する工業的技術が発展を遂げている。本研究はそれらに基礎的な知見を与えることが期待される。また、細胞内には形状が変形するタンパク質が多数存在するが、そういったアクティブな要素が変形運動を続ける環境下での物質拡散に対しても重要な知見を与える可能性がある。

Report

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

    (25 results)

All 2024 2023 2022 2021 2020

All Journal Article (12 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 12 results,  Open Access: 4 results) Presentation (13 results) (of which Int'l Joint Research: 5 results,  Invited: 2 results)

  • [Journal Article] Quantitative Analysis of the Complex Time Evolution of a Camphor Boat2024

    • Author(s)
      Rolinski Tomasz、Kitahata Hiroyuki、Koyano Yuki、Gorecki Jerzy
    • Journal Title

      Applied Sciences

      Volume: 14 Issue: 3 Pages: 959-959

    • DOI

      10.3390/app14030959

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Mathematical modeling for the synchronization of two interacting active rotors2023

    • Author(s)
      Kitahata Hiroyuki、Koyano Yuki
    • Journal Title

      Physical Review E

      Volume: 107 Issue: 6 Pages: 064607-064607

    • DOI

      10.1103/physreve.107.064607

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] New types of complex motion of a simple camphor boat2023

    • Author(s)
      Loffler Richard J.G.、Rolinski Tomasz、Kitahata Hiroyuki、Koyano Yuki、Gorecki Jerzy
    • Journal Title

      Physical Chemistry Chemical Physics

      Volume: 25 Issue: 11 Pages: 7794-7804

    • DOI

      10.1039/d2cp05707g

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Anomalous diffusion and transport by a reciprocal convective flow2022

    • Author(s)
      Koyano Yuki、Kitahata Hiroyuki
    • Journal Title

      Physical Review E

      Volume: 106 Issue: 2 Pages: 024102-024102

    • DOI

      10.1103/physreve.106.024102

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Pairing-induced motion of source and inert particles driven by surface tension2022

    • Author(s)
      Ishikawa Hiroaki、Koyano Yuki、Kitahata Hiroyuki、Sumino Yutaka
    • Journal Title

      Physical Review E

      Volume: 106 Issue: 2 Pages: 024604-024604

    • DOI

      10.1103/physreve.106.024604

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Complexity and bifurcations in the motion of a self-propelled rectangle confined in a circular water chamber2022

    • Author(s)
      Kitahata Hiroyuki、Koyano Yuki、Loffler Richard J.G.、Gorecki Jerzy
    • Journal Title

      Physical Chemistry Chemical Physics

      Volume: 24 Issue: 34 Pages: 20326-20335

    • DOI

      10.1039/d2cp02456j

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Self-propelled motion of the camphor float with n-fold rotational symmetry2022

    • Author(s)
      Hiroyuki Kitahata and Yuki Koyano
    • Journal Title

      Frontiers in Physics

      Volume: 10 Pages: 858791-858791

    • DOI

      10.3389/fphy.2022.858791

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Imperfect bifurcation in the rotation of a propeller-shaped camphor rotor2021

    • Author(s)
      Koyano Yuki、Kitahata Hiroyuki
    • Journal Title

      Physical Review E

      Volume: 103 Issue: 1

    • DOI

      10.1103/physreve.103.012202

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Autonomous elastic microswimmer2021

    • Author(s)
      Era Katsutomo、Koyano Yuki、Hosaka Yuto、Yasuda Kento、Kitahata Hiroyuki、Komura Shigeyuki
    • Journal Title

      EPL (Europhysics Letters)

      Volume: 133 Issue: 3 Pages: 34001-34001

    • DOI

      10.1209/0295-5075/133/34001

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Two Floating Camphor Particles Interacting through the Lateral Capillary Force2020

    • Author(s)
      Hirose Yuhei、Yasugahira Yusuke、Okamoto Mamoru、Koyano Yuki、Kitahata Hiroyuki、Nagayama Masaharu、Sumino Yutaka
    • Journal Title

      Journal of the Physical Society of Japan

      Volume: 89 Issue: 7 Pages: 074004-074004

    • DOI

      10.7566/jpsj.89.074004

    • NAID

      40022283350

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Spontaneous Motion of a Camphor Particle with a Triangular Modification from a Circle2020

    • Author(s)
      Kitahata Hiroyuki、Koyano Yuki
    • Journal Title

      Journal of the Physical Society of Japan

      Volume: 89 Issue: 9

    • DOI

      10.7566/jpsj.89.094001

    • NAID

      40022344756

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Diffusion enhancement in a levitated droplet via oscillatory deformation2020

    • Author(s)
      Koyano Yuki、Kitahata Hiroyuki、Hasegawa Koji、Matsumoto Satoshi、Nishinari Katsuhiro、Watanabe Tadashi、Kaneko Akiko、Abe Yutaka
    • Journal Title

      Physical Review E

      Volume: 102 Issue: 3

    • DOI

      10.1103/physreve.102.033109

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Presentation] Anomalous diffusion under a reciprocal convective flow2023

    • Author(s)
      Yuki Koyano and Hiroyuki Kitahata
    • Organizer
      STATPHYS28
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 相互作用する2つの自発回転子にみられる同期現象の数理2023

    • Author(s)
      小谷野由紀
    • Organizer
      札幌非線形現象研究会2023
    • Related Report
      2023 Annual Research Report
  • [Presentation] Synchronization of two interacting active rotors2023

    • Author(s)
      Yuki Koyano
    • Organizer
      Advanced core-to-core network for the physics of self-organizing active matter
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 樟脳回転子の運動にみられる同期現象2023

    • Author(s)
      小谷野由紀, 北畑裕之
    • Organizer
      日本物理学会第78回年次大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 往復する振動対流の下での拡散・移流2022

    • Author(s)
      小谷野由紀
    • Organizer
      札幌非線形現象研究会2022
    • Related Report
      2022 Research-status Report
  • [Presentation] Imperfect bifurcation in the rotation of a propeller-shaped camphor rotor2022

    • Author(s)
      Yuki Koyano and Hiroyuki Kitahata
    • Organizer
      The 5th Symposium on International Joint Graduate Program in Material Science
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Anomalous diffusion and transport by a reciprocal convective flow2022

    • Author(s)
      Yuki Koyano
    • Organizer
      Poland-Japan symposium on spatio-temporal self-organization 2022
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] 固体基板上の自己駆動液滴の自走・合体ダイナミクス2022

    • Author(s)
      小谷野由紀, 内田就也
    • Organizer
      日本物理学会第77回年次大会
    • Related Report
      2021 Research-status Report
  • [Presentation] Imperfect bifurcation in the rotation of a propeller-shaped camphor rotor2021

    • Author(s)
      Yuki Koyano
    • Organizer
      RIMS Workshop "Mathematical Mechanobiology"
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 往復する振動対流の下での拡散挙動2021

    • Author(s)
      小谷野 由紀, 北畑 裕之
    • Organizer
      日本物理学会2021年秋季大会
    • Related Report
      2021 Research-status Report
  • [Presentation] Bifurcation structure in a self-rotating camphor particle system2021

    • Author(s)
      Yuki Koyano
    • Organizer
      Poland-Japan symposium on spatio-temporal self-organization 2021
    • Related Report
      2021 Research-status Report
  • [Presentation] プロペラ型樟脳粒子の自転運動にみられる不完全分岐2021

    • Author(s)
      小谷野 由紀, 北畑 裕之
    • Organizer
      日本物理学会第76回年次大会
    • Related Report
      2020 Research-status Report
  • [Presentation] 周期的な停止操作の下で自発的に回転方向を変える回転子2020

    • Author(s)
      小谷野 由紀, 北畑 裕之, 中田 聡, Jerzy Gorecki
    • Organizer
      日本物理学会2020年秋季大会
    • Related Report
      2020 Research-status Report

URL: 

Published: 2020-04-28   Modified: 2025-01-30  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi