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Related Experiment Video

Updated: May 29, 2026

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

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

Published on: January 3, 2014

Alignment of particles in sheared viscoelastic fluids.

I S Santos de Oliveira¹, A van den Noort, J T Padding

¹Computational Biophysics, University of Twente, P.O. Box 217, 7500 AE, Enschede, The Netherlands. i.s.santosdeoliveira@utwente.nl

The Journal of Chemical Physics

|September 22, 2011

Summary

Computer simulations reveal how colloidal particles behave in non-Newtonian fluids under shear. Particles form strings in micellar solutions but remain dispersed in polymer solutions, matching experimental findings.

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Area of Science:

Colloid and interface science
Rheology
Computational physics

Background:

Non-Newtonian fluids exhibit complex flow behavior due to their microstructure.
Understanding shear-induced effects on dispersed particles is crucial for material science.
Viscoelastic fluids like polymer and micellar solutions show unique entanglement dynamics.

Purpose of the Study:

To investigate shear-induced structure formation of colloidal particles in viscoelastic fluids.
To compare particle behavior in semi-dilute polymer solutions versus worm-like micellar solutions.
To validate simulation methods against experimental rheological data.

Main Methods:

Utilized responsive particle dynamics (RPD) simulations for large-scale, three-dimensional modeling.
Modeled fluid chains as soft Brownian particles with evolving inter-particle degrees of freedom.
Simulated systems with up to 96 spherical colloids under shear flow.

Main Results:

Homogeneous mixing of colloids in quiescent fluids.
Colloids aligned into strings along the flow direction in micellar solutions under shear.
Colloids remained randomly distributed in polymer solutions under shear.
Simulated rheological properties (moduli, viscosities) agreed with experimental values.

Conclusions:

Simulation results align with recent experimental observations of colloid behavior in these fluids.
Distinct shear-induced structural differences were observed between polymer and micellar solutions.
The RPD method effectively captures complex fluid-particle interactions and emergent structures.