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Zsigmond Varga1, Vincent Grenard2, Stefano Pecorario2

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Attractive particle suspensions form log-rolling flocs under shear due to hydrodynamic coupling. This shear-induced structuring can be controlled using a Mason number for particle assembly and patterning.

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Area of Science:

  • Fluid dynamics
  • Colloid science
  • Materials science

Background:

  • Repulsive particle suspensions behave predictably, but attractive particle suspensions exhibit complex behaviors.
  • Weakly attractive particles form anisotropic microstructures and flow instabilities under shear, hindering industrial applications.
  • Log-rolling flocs are a common phenomenon in sheared attractive particle suspensions confined between parallel plates.

Purpose of the Study:

  • To elucidate the mechanism behind shear-induced log-rolling floc formation in attractive particle suspensions.
  • To investigate the role of hydrodynamic coupling between flocs and confining boundaries.
  • To develop a universal framework for understanding and controlling this phenomenon.

Main Methods:

  • Combined experimental observations with discrete element simulations.
  • Analyzed the formation of viscous eddies and particle aggregation.
  • Rescaled numerical and experimental results using the Mason number.

Main Results:

  • Shear-induced structuring is driven by hydrodynamic coupling, leading to periodically spaced viscous eddies.
  • These eddies serve as stable regions for particle aggregation, forming flocs along the vorticity direction.
  • Simulation results for floc dimensions quantitatively matched experimental data for both colloidal and noncolloidal suspensions.

Conclusions:

  • Hydrodynamic coupling with boundaries is the primary driver of log-rolling floc formation.
  • The Mason number provides a universal scaling parameter for stability diagrams of these structures.
  • Shear-induced structuring can be utilized as a method for assembling and patterning attractive particle suspensions.