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Modulation of turbulence by droplet coalescence

Research Project

Project/Area Number 20K22402
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0301:Mechanics of materials, production engineering, design engineering, fluid engineering, thermal engineering, mechanical dynamics, robotics, aerospace engineering, marine and maritime engineering, and related fields
Research InstitutionOkinawa Institute of Science and Technology Graduate University

Principal Investigator

Rosti Marco Edoardo  沖縄科学技術大学院大学, 複雑流体・流動ユニット, 准教授 (80876227)

Project Period (FY) 2020-09-11 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
KeywordsMultiphase flows / Turbulence / Drops and bubbles / Droplet-Laden flows / Numerical simulations / Droplets / Bubbles / Fluid dynamics
Outline of Research at the Start

We will perform direct numerical simulations to understand the role of finite-size droplets coalescence on turbulent flows. To do so, we will use a volume of fluid method where the droplets coalescence can be controlled. To get a deeper understanding of how energy is redistributed in the flow, we will consider the governing equation for the energy spectrum and evaluate the contribution of each term at the different scales. By comparing the results obtained for cases with different coalescence efficiency, we will elucidate its role on the process.

Outline of Final Research Achievements

The effect of coalescence on droplets suspensions has been investigate numerically in both laminar and turbulent flow conditions. In laminar flow conditions, I studied how the rheology of droplets is affected by coalescence when the carrier fluid is non-Newtonian. The effect of viscosity ratio among the two phases, shear-thinning and thickening, and elasticity have been tackled. In turbulent flow conditions, I studied the effect of coalescence in homogeneous isotropic turbulent flows, in homogeneous shear flows and in plane channel flows. In the first two, the effect of viscosity ratio and elasticity have been investigated, while in the latter the role of coalescence was singled out by preventing it and comparing the results to those from a case where this effect was allowed. In addition to the above analysis, I have worked on the numerical methods to simulate droplet laden system with different level of complexity, enabling the study of contact line dynamics and droplet evaporation.

Academic Significance and Societal Importance of the Research Achievements

We showed that droplets provide a spectral shortcut, subtracting energy from the large scales and re-introducing it at smaller scales, and coalescence changes the scale at which the energy is re-introduced. In wall-bounded flows, the effect of coalescence is stronger due to droplet migration.

Report

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

    (12 results)

All 2022 2021 2020

All Journal Article (5 results) Presentation (7 results) (of which Int'l Joint Research: 2 results,  Invited: 2 results)

  • [Journal Article] Finite-size evaporating droplets in weakly compressible homogeneous shear turbulence2022

    • Author(s)
      Scapin Nicolo、Dalla Barba Federico、Lupo Giandomenico、Rosti Marco Edoardo、Duwig Christophe、Brandt Luca
    • Journal Title

      Journal of Fluid Mechanics

      Volume: 934

    • DOI

      10.1017/jfm.2021.1140

    • Related Report
      2021 Annual Research Report
  • [Journal Article] Modulation of homogeneous and isotropic turbulence in emulsions2022

    • Author(s)
      Crialesi-Esposito Marco、Rosti Marco Edoardo、Chibbaro Sergio、Brandt Luca
    • Journal Title

      Journal of Fluid Mechanics

      Volume: 940

    • DOI

      10.1017/jfm.2022.179

    • Related Report
      2021 Annual Research Report
  • [Journal Article] A fully Eulerian hybrid immersed boundary-phase field model for contact line dynamics on complex geometries2021

    • Author(s)
      Shahmardi Armin、Rosti Marco Edoardo、Tammisola Outi、Brandt Luca
    • Journal Title

      Journal of Computational Physics

      Volume: 443 Pages: 110468-110468

    • DOI

      10.1016/j.jcp.2021.110468

    • Related Report
      2021 Annual Research Report
  • [Journal Article] The effect of droplet coalescence on drag in turbulent channel flows2021

    • Author(s)
      Cannon Ianto、Izbassarov Daulet、Tammisola Outi、Brandt Luca、Rosti Marco E.
    • Journal Title

      Physics of Fluids

      Volume: 33 Issue: 8 Pages: 085112-085112

    • DOI

      10.1063/5.0058632

    • Related Report
      2021 Annual Research Report
  • [Journal Article] Shear-thinning and shear-thickening emulsions in shear flows2021

    • Author(s)
      Rosti Marco E.、Takagi Shu
    • Journal Title

      Physics of Fluids

      Volume: 33 Issue: 8 Pages: 083319-083319

    • DOI

      10.1063/5.0063180

    • Related Report
      2021 Annual Research Report
  • [Presentation] Droplets in shear flows2021

    • Author(s)
      Marco Rosti
    • Organizer
      BICTAM-CISM Symposium on Dispersed Multiphase Flows
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] Coalescence reduces drag in turbulent bubbly channel flows2021

    • Author(s)
      Ianto Cannon
    • Organizer
      EUROMECH Colloquium 621
    • Related Report
      2021 Annual Research Report
  • [Presentation] Droplets in shear flows2021

    • Author(s)
      Marco Rosti
    • Organizer
      ICTAM 2020+1
    • Related Report
      2021 Annual Research Report
  • [Presentation] Coalescence and drag in bubbly channel flows2021

    • Author(s)
      Ianto Cannon
    • Organizer
      Annual Meeting of the Japanese Society of Fluid Mechanics
    • Related Report
      2021 Annual Research Report
  • [Presentation] Direct numerical simulations of surfactants in bubbly tri-periodic turbulent flows2021

    • Author(s)
      Ianto Cannon
    • Organizer
      APS - DFD meeting
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Droplet breakup limits in simple shear flows2021

    • Author(s)
      Mohamed Abdelgawad
    • Organizer
      ESCHM-ISCH-ISB 2021
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Droplet coalescence in turbulent channel flows2020

    • Author(s)
      Ianto Cannon; Marco E. Rosti
    • Organizer
      34th Computational Fluid Dynamics Symposium of Japan Society of Fluid Mechanics
    • Related Report
      2020 Research-status Report

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Published: 2020-09-29   Modified: 2023-01-30  

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