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Related Experiment Video

Updated: Jun 19, 2026

Experimental Measurement of Settling Velocity of Spherical Particles in Unconfined and Confined Surfactant-based Shear Thinning Viscoelastic Fluids

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Published on: January 3, 2014

Soft Dynamics simulation. 2. Elastic spheres undergoing a T(1) process in a viscous fluid.

P Rognon¹, C Gay

¹Centre de Recherche Paul Pascal, CNRS UPR 8641, Av. Dr. Schweitzer, Pessac, France.

The European Physical Journal. E, Soft Matter

|October 23, 2009

Summary

This study explores particle rearrangement dynamics in viscous fluids, revealing that collective behavior depends on local particle reorganization timescales, not just particle density. This finding impacts understanding granular materials and complex fluids.

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Area of Science:

* Physics
* Materials Science
* Fluid Dynamics

Background:

* Constitutive laws for granular materials traditionally rely on single-particle dynamics timescales.
* Complex behaviors like viscosity bifurcation and shear localization in various soft matter systems suggest involvement of additional micro-timescales.
* Local particle reorganization dynamics are hypothesized to influence these complex behaviors.

Purpose of the Study:

* To theoretically and numerically investigate the T(1) process as a model for particle rearrangement in a viscous fluid.
* To explore the influence of local particle interactions and initial conditions on collective behavior.
* To identify novel parameters governing the dynamics of granular materials and soft matter systems.

Main Methods:

* Employed the Soft Dynamics simulation method for theoretical and numerical analysis.
* Modeled four elastic spheres in a viscous fluid.
* Incorporated hydrodynamic interactions at the lubrication level (Poiseuille squeezing, Couette shear flow).
* Utilized Hertzian mechanics to model elastic particle surface deflection.

Main Results:

* Demonstrated that the duration of the T(1) process is sensitive to minute changes in initial particle separations.
* Showed substantial variation in T(1) process duration, consistent with theoretical predictions.
* Identified a dependence of collective behavior on a parameter other than the conventional particle volume fraction for the first time.

Conclusions:

* Local particle reorganization dynamics, exemplified by the T(1) process, play a crucial role in the collective behavior of granular materials in viscous fluids.
* The findings challenge the traditional reliance solely on single-particle dynamics and volume fraction for constitutive laws.
* This research provides new insights into the micro-mechanisms governing complex fluid and granular material behaviors.