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Aggregation behavior of two spheres falling through an aging fluid.

Blandine Gueslin1, Laurence Talini, Benjamin Herzhaft

  • 1Université Pierre et Marie Curie-Paris6, UMR7608, Orsay F-91405 France.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
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Summary

Two spheres settling in aging yield stress fluids cluster together if close enough, regardless of fluid wake structure. Unexpected lateral motion occurs when negative wakes are observed.

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Area of Science:

  • Rheology
  • Fluid Dynamics
  • Colloid Science

Background:

  • Yield stress fluids exhibit time-dependent properties, such as aging.
  • Particle sedimentation in complex fluids generates unique flow patterns, including negative wakes.
  • Understanding particle interactions is crucial for predicting suspension behavior.

Purpose of the Study:

  • To investigate the behavior of two settling spheres in an aging yield stress fluid.
  • To determine the influence of wake structure on particle clustering.
  • To observe any anomalous motion of spheres during sedimentation.

Main Methods:

  • Experimental observation of two identical spheres settling in a Laponite suspension.
  • Analysis of particle trajectories and inter-particle distances.
  • Correlation of sphere behavior with fluid stress and wake characteristics.

Main Results:

  • Identical spheres consistently cluster when their initial separation is less than 15 radii.
  • The clustering behavior is independent of the observed wake structure (negative or non-negative).
  • An unexpected lateral motion of spheres was observed under conditions with a negative wake.

Conclusions:

  • Sphere proximity dictates clustering in aging yield stress fluids, overriding wake effects.
  • Negative wakes in these fluids can induce complex, non-axial particle motion.
  • This study provides insights into particle dynamics in time-dependent soft matter systems.