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Capture-induced transition in foamy suspensions.

Y Khidas1, B Haffner, O Pitois

  • 1Université Paris Est, Laboratoire Navier, UMR 8205 CNRS - École des Ponts ParisTech - IFSTTAR 5bd Descartes, 77454 Marne-la-Vallée Cedex 2, France.

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We studied how foamy granular suspensions drain. Particle size relative to foam constrictions (λ) dictates drainage: small particles drain freely (λ<1), while large particles get trapped (λ>1), significantly slowing liquid flow.

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Area of Science:

  • Rheology of complex fluids
  • Granular physics
  • Foam science

Background:

  • Foamy granular suspensions exhibit complex flow behaviors.
  • Understanding drainage is crucial for industrial processes involving foams and granular materials.

Purpose of the Study:

  • To investigate the drainage dynamics of foamy granular suspensions.
  • To identify key parameters controlling liquid drainage and particle transport.

Main Methods:

  • Experimental investigation of drainage velocity under varying bubble size, particle size, and gas volume fraction.
  • Introduction and analysis of the parameter λ (particle size to pore constriction size ratio).

Main Results:

  • Drainage velocity shows significant fluctuations with changes in bubble and particle size, and gas volume fraction.
  • Particle capture, governed by λ, is identified as the primary factor controlling drainage.
  • A sharp transition in drainage behavior occurs at λ=1, distinguishing free particle drainage from particle trapping.

Conclusions:

  • The parameter λ effectively predicts drainage behavior in foamy granular suspensions.
  • A phenomenological model is proposed to describe the observed drainage phenomena based on particle capture.