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Modeling the Microstructure and Stress in Dense Suspensions under Inhomogeneous Flow.

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Summary
This summary is machine-generated.

Dense suspensions under inhomogeneous flow show surprising behavior, defying standard rheology. Our model explains this by including shear rate fluctuations, matching simulation results.

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Area of Science:

  • Rheology
  • Fluid Dynamics
  • Materials Science

Background:

  • Dense suspensions often deviate from conventional homogeneous rheology under flow.
  • Observed phenomena include flowing regions with friction below yielding and volume fractions above jamming criteria.

Purpose of the Study:

  • To explain the underlying physics of dense suspension behavior in inhomogeneous flow.
  • To incorporate shear rate fluctuations into a tensor model for microstructure and stress.

Main Methods:

  • Development and application of a tensor model for microstructure and stress.
  • Inclusion of shear rate fluctuations into the existing tensor model.
  • Analysis of inhomogeneous flow problems using the modified model.

Main Results:

  • The modified tensor model qualitatively reproduces particle-based simulation results.
  • The model successfully captures the complex behavior of dense suspensions in inhomogeneous flow.
  • Demonstration of how shear rate fluctuations influence macroscopic friction and volume fraction.

Conclusions:

  • Shear rate fluctuations are critical for understanding dense suspension rheology in inhomogeneous flows.
  • The proposed tensor model provides a viable framework for predicting suspension behavior.
  • The findings challenge conventional homogeneous rheological assumptions for dense suspensions.