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Viscosity minimum in bimodal concentrated suspensions under shear.

A Núñez1, R Darias, R Pinto

  • 1Laboratorio de Física Estadística de Sistemas Desordenados, Centro de Física, IVIC, Apartado 21827, Caracas 1020A, Venezuela.

The European Physical Journal. E, Soft Matter
|March 11, 2004
PubMed
Summary

This study explores concentrated bimodal suspensions under shear, revealing a viscosity minimum dependent on particle size ratios. Increased microscopic friction reduces macroscopic viscosity, aligning with experimental findings in concentrated emulsions.

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Area of Science:

  • Rheology and Soft Matter Physics
  • Computational Fluid Dynamics
  • Materials Science

Background:

  • Classical theories of concentrated suspensions, like Farris's (1968), provide a baseline for understanding suspension behavior.
  • Bimodal suspensions, with varying proportions of large and small particles, present complex flow dynamics not fully captured by existing models.
  • Understanding shear viscosity in concentrated systems is crucial for predicting material behavior in industrial and natural processes.

Purpose of the Study:

  • To investigate the shear viscosity of two-dimensional concentrated bimodal suspensions.
  • To identify and analyze the conditions leading to a minimum in shear viscosity as a function of particle size distribution.
  • To explore the influence of particle interactions, shear rates, and friction parameters on macroscopic viscosity.

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Main Methods:

  • Development and application of a computational model for concentrated suspensions under shear.
  • Utilizing a linear-response scheme to analyze the dependence of viscosity on shear and friction parameters.
  • Simulation of shear geometries imposed by external forces and boundaries, including dynamically imposed shear.

Main Results:

  • A shear viscosity minimum was observed as a function of the small-to-large-particle ratio in bimodal suspensions.
  • The viscosity minimum's dependence on imposed shear and microscopic drop friction parameters was quantified.
  • Macroscopic viscosity decreased with increasing microscopic friction parameters, explained via a two-drop model.

Conclusions:

  • The study extends classical suspension theory by identifying a viscosity minimum in bimodal systems.
  • Microscopic friction plays a significant role in reducing macroscopic viscosity, offering insights into particle-level interactions.
  • Simulation results show qualitative agreement with experimental data from concentrated bimodal emulsions.