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Related Experiment Video

Updated: Jul 23, 2025

Macro-Rheology Characterization of Gill Raker Mucus in the Silver Carp, Hypophthalmichthys molitrix
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Rheology of granular rafts.

J Lalieu1, A Seguin1, G Gauthier1

  • 1Université Paris-Saclay, CNRS, Laboratoire FAST, F-91405 Orsay, France.

Physical Review. E
|July 19, 2023
PubMed
Summary
This summary is machine-generated.

Granular rafts exhibit Bingham fluid rheology, with viscosity increasing with surface fraction. Particle velocity measurements reveal nonlocal behavior and a quasistatic zone, characteristic of granular matter.

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Area of Science:

  • Physics
  • Materials Science
  • Fluid Dynamics

Background:

  • Macroscopic particle-laden interfaces, termed granular rafts, present unique rheological challenges.
  • Understanding their behavior is crucial for applications involving suspensions and granular flows.

Purpose of the Study:

  • To experimentally investigate the rheology of granular rafts under simple shear.
  • To analyze particle velocity fields and characterize the flow behavior within the raft.

Main Methods:

  • Utilized a classical rheometer to apply simple shear to granular rafts.
  • Measured particle velocity fields in the stationary state.
  • Employed an extended kinetic theory to describe the flowing region.

Main Results:

  • Observed Bingham fluid-like shear-stress relations, with viscosity diverging similarly to 2D suspensions.
  • Revealed nonlocal rheology analogous to dry granular materials.
  • Identified distinct regions of high local shear rate near walls and a quasistatic zone in the center.

Conclusions:

  • Granular rafts exhibit complex rheology, including nonlocal effects and a central quasistatic zone.
  • The observed behavior aligns with principles governing granular matter and extended kinetic theories.
  • The study provides insights into the flow dynamics of particle-laden interfaces.