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Complex dynamics of shear banded flows.

Suzanne M Fielding1

  • 1School of Mathematics and Manchester Centre for Nonlinear Dynamics, University of Manchester, Oxford Road, Manchester, UKM13 9PL. suzanne.fielding@manchester.ac.uk.

Soft Matter
|September 9, 2020
PubMed
Summary

Complex fluids exhibit shear banding, a flow-induced transition to coexisting viscosity bands. Recent theoretical efforts aim to explain the complex, often chaotic, dynamics observed in these shear bands.

Area of Science:

  • Rheology
  • Soft Matter Physics
  • Fluid Dynamics

Background:

  • Many complex fluids, including wormlike micellar surfactants, onion surfactants, colloidal suspensions, and polymer solutions, exhibit shear banding.
  • Shear banding is a flow-induced transition to a state of coexisting bands with differing viscosities and internal structures.
  • Experimental evidence shows that shear bands often display complex dynamics, such as oscillations or chaotic behavior.

Purpose of the Study:

  • To review the experimental evidence of shear banding in complex fluids.
  • To provide a detailed overview of recent theoretical approaches to understanding shear banding dynamics.
  • To connect experimental observations with theoretical frameworks for complex fluid behavior.

Main Methods:

  • Review of experimental findings on shear banding dynamics.

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  • Analysis of theoretical models addressing shear banding phenomena.
  • Comparison of theoretical predictions with experimental rheological and interfacial motion data.

    • Main Results:

    • Shear banding is a common phenomenon in various complex fluids.
    • The dynamics of shear bands can be oscillatory or chaotic, impacting bulk rheological signals.
    • Recent theoretical efforts are beginning to explain the observed complex dynamics.

    Conclusions:

    • Shear banding is a critical phenomenon in complex fluids with significant implications for their flow behavior.
    • Understanding the complex dynamics of shear bands is crucial for predicting and controlling the performance of these materials.
    • Theoretical frameworks are essential for interpreting experimental results and advancing the field of complex fluid dynamics.