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Related Experiment Videos

Structuring sedimentation in a shear-thinning fluid.

S Mora1, L Talini, C Allain

  • 1Laboratoire FAST, Bâtiment 502, Campus Universitaire, 91405 Orsay Cedex, France.

Physical Review Letters
|October 4, 2005
PubMed
Summary
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Particle aggregation in shear-thinning fluids forms structures. These structures, driven by gravitational instability, create distinct flow patterns in non-Brownian particle suspensions.

Area of Science:

  • Fluid dynamics
  • Rheology
  • Colloid science

Background:

  • Sedimentation of particles in fluids is crucial in various industrial processes.
  • Understanding particle behavior in non-Newtonian fluids, like shear-thinning polymers, presents unique challenges.
  • Previous studies have explored particle dynamics but often in simpler fluid systems.

Purpose of the Study:

  • To investigate the sedimentation of monodisperse non-Brownian particles in a shear-thinning polymeric fluid.
  • To identify and characterize the formation of particle-rich structures during sedimentation.
  • To elucidate the relationship between observed particle structuring and fluid flow patterns.

Main Methods:

  • Experimental study of particle sedimentation.
  • Utilizing monodisperse non-Brownian particles.

Related Experiment Videos

  • Employing a shear-thinning polymeric fluid medium.
  • Observing and analyzing particle aggregation and flow dynamics.

    • Main Results:

    • Observed the formation of distinct particle-rich structures.
    • Demonstrated a clear association between these structures and a well-defined flow pattern.
    • Evidence suggests particle aggregation amplifies concentration heterogeneities.
    • The flow pattern is further influenced by gravitational instability.

    Conclusions:

    • Particle aggregation is the primary driver for the observed structuring in these suspensions.
    • Gravitational instability plays a significant role in shaping the flow patterns.
    • The interplay between particle aggregation and fluid rheology dictates complex sedimentation behavior.