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Measuring shear-induced self-diffusion in a counterrotating geometry.

V Breedveld1, D van den Ende, M Bosscher

  • 1Rheology Group, Department of Applied Physics, Twente Institute of Mechanics, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands. victor@engineering.ucsb.edu

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|April 20, 2001
PubMed
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This study measures shear-induced self-diffusion in concentrated suspensions using a novel correlation method. Particle motion becomes diffusive above a critical shear rate-time product, with diffusion coefficients peaking around 40% particle volume fraction.

Area of Science:

  • Fluid dynamics
  • Rheology
  • Colloid science

Background:

  • Shear-induced self-diffusion is crucial in concentrated suspensions.
  • Previous methods limited the accessible range of dimensionless time (gamma;Deltat).
  • Understanding particle motion under shear is key for material processing.

Purpose of the Study:

  • To measure shear-induced self-diffusion coefficients in concentrated noncolloidal hard sphere suspensions.
  • To investigate particle motion over an extended range of dimensionless time (gamma;Deltat).
  • To determine the dependence of self-diffusion on particle volume fraction (phi).

Main Methods:

  • Utilized a novel correlation method in a dedicated counterrotating geometry.
  • Performed experiments with a wide radius geometry for a well-defined flow field.

Related Experiment Videos

  • Enabled optical access from multiple directions for comprehensive measurements.

    • Main Results:

    • Observed a transition to diffusive particle motion for gamma;Deltat of O(1).
    • Self-diffusion coefficients showed non-monotonic dependence on particle volume fraction (phi).
    • Diffusion coefficients exhibited exponential growth up to phi=0.35, then leveled off, suggesting a maximum around phi=0.40.

    Conclusions:

    • The study provides new insights into shear-induced self-diffusion in concentrated suspensions.
    • Experimental results challenge previous numerical and theoretical predictions regarding diffusion coefficient dependence on volume fraction.
    • Findings align with some experimental literature but extend the accessible parameter space significantly.