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Direct visualization of shear waves in viscoelastic fluid using microspheres.

C Labuda1, C M Tierney1, E G Sunethra K Dayavansha1

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Viscoelastic wormlike micellar fluids support shear waves. Microsphere seeding offers a viable alternative to birefringence for visualizing shear waves and measuring fluid attenuation, especially at low concentrations.

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Area of Science:

  • Rheology
  • Soft Matter Physics
  • Fluid Dynamics

Background:

  • Wormlike micellar fluids exhibit viscoelastic properties.
  • These viscoelastic fluids can support the propagation of shear waves.
  • Understanding shear wave behavior is crucial for characterizing fluid dynamics.

Purpose of the Study:

  • To visualize shear waves in a 500 mM CTAB-NaSal micellar fluid.
  • To compare microsphere seeding with birefringence for shear wave visualization.
  • To evaluate the potential of microsphere displacement for measuring fluid attenuation.

Main Methods:

  • Seeding the micellar fluid with polyethylene microspheres (212–250 μm diameter).
  • Visualizing shear waves through particle displacement.
  • Comparing microsphere visualization with birefringence induced by shear stress.
  • Measuring shear wave speeds and particle displacement patterns.

Main Results:

  • Shear wave speeds were measured as 733 mm/s (microspheres) and 722 mm/s (birefringence).
  • Particle displacement followed a sinusoidal function of time.
  • Displacement amplitude decreased quadratically with distance from the source.

Conclusions:

  • Microsphere seeding is a valid method for visualizing shear waves in wormlike micellar fluids.
  • Particle displacement measurements can quantify attenuation, even when birefringence fails at low concentrations.
  • This technique enhances the study of viscoelastic fluid dynamics.