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  3. Density Waves In Shear-thickening Suspensions.
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  3. Density Waves In Shear-thickening Suspensions.

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Density waves in shear-thickening suspensions.

Guillaume Ovarlez1, Anh Vu Nguyen Le2, Wilbert J Smit2

  • 1Univ. Bordeaux, CNRS, Solvay, LOF, UMR 5258, F-33608 Pessac, France.

Science Advances
|June 5, 2020

View abstract on PubMed

Summary
This summary is machine-generated.

Shear thickening in concentrated suspensions creates periodic density and stress waves. These flow dynamics, previously not understood, reveal complex behaviors in industrial and natural fluids.

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Area of Science:

  • Rheology
  • Fluid Dynamics
  • Materials Science

Background:

  • Shear thickening is a phenomenon where viscosity increases with shear rate.
  • Observed in diverse concentrated suspensions like concrete, magma, and cornstarch mixtures.
  • Complex flow dynamics in these systems remain poorly understood.

Purpose of the Study:

  • To elucidate the flow mechanisms of shear-thickening suspensions.
  • To explain the complex dynamics reported in existing literature.
  • To investigate the role of density and stress fluctuations.

Main Methods:

  • Experimental observation of shear-thickening fluid flow.
  • Analysis of density fluctuations and their wave-like behavior.
  • Measurement of normal stress fluctuations and their periodicity.

Main Results:

  • Identified periodic density fluctuations as waves moving with the flow.
  • Observed these waves break azimuthal symmetry.
  • Detected strong normal stress fluctuations synchronized with density waves.
  • Quantified stress inhomogeneities ranging from hundreds of pascals to tens of kilopascals.

Conclusions:

  • Shear-thickening suspensions exhibit complex flow patterns involving density and stress waves.
  • These stress inhomogeneities may significantly contribute to industrial damage.
  • Understanding these dynamics is crucial for managing thickening fluids.