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Two-scale evolution during shear reversal in dense suspensions.

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This summary is machine-generated.

Dense suspensions exhibit complex stress behavior upon shear reversal. Particle contacts and hydrodynamic forces interact distinctly at different strains, leading to nonmonotonic responses crucial for understanding material flow.

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Area of Science:

  • Rheology and Soft Matter Physics
  • Computational Fluid Dynamics
  • Materials Science

Background:

  • Dense suspensions of non-Brownian, noninertial particles are ubiquitous in industrial applications.
  • Understanding their rheological behavior under shear is critical for process design and material performance.
  • Previous studies often simplified particle interactions, neglecting detailed contact mechanics.

Purpose of the Study:

  • To investigate the rheology of dense, non-Brownian, noninertial suspensions using advanced simulation techniques.
  • To elucidate the contributions of hydrodynamic and contact forces to the transient stress response.
  • To explore the influence of particle surface properties (roughness, repulsion) on suspension microstructure and rheology.

Main Methods:

  • Developed and employed shear-reversal simulations to probe suspension dynamics.
  • Resolved lubrication forces between adjacent particles and modeled particle-surface contacts.
  • Analyzed hydrodynamic and contact stresses, contact networks, and microstructural evolution at varying strain scales.

Main Results:

  • Observed rate-independent, nonmonotonic transient stress response upon shear reversal, matching experimental findings.
  • Identified distinct responses at small strains (contact breakage) and large strains (structural reorientation).
  • Demonstrated that the combination of opposing trends in hydrodynamic and contact stresses causes the nonmonotonic behavior.

Conclusions:

  • Particle contacts play a pivotal role in the rheology of dense suspensions, particularly in dictating responses at different strain magnitudes.
  • Hydrodynamic and contact stresses evolve on different strain scales and with opposing trends, leading to complex macroscopic behavior.
  • Particle roughness and repulsion significantly influence microstructure and, consequently, the scale-dependent stress response.