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Related Experiment Video

Updated: Jun 5, 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

Viscoelastic properties of ferrofluids.

D N Chirikov¹, S P Fedotov, L Yu Iskakova

¹Urals State University, Lenina Avenue, 620083 Ekaterinburg, Russia.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|January 15, 2011

Summary

This study explains non-linear viscoelasticity in magnetic ferrofluids using a statistical model of particle chain evolution. The model accurately predicts stress relaxation after shear rate changes, aligning with experimental data.

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Area of Science:

Physics
Materials Science
Rheology

Background:

Ferrofluids exhibit complex non-linear viscoelastic behavior under magnetic fields.
Macroscopic viscous stress relaxation after shear rate changes is a key phenomenon.
Existing models may not fully capture the dynamics of particle aggregation.

Purpose of the Study:

To theoretically investigate non-linear viscoelastic phenomena in ferrofluids.
To explain non-stationary flow and stress relaxation using a particle aggregation model.
To correlate theoretical predictions with experimental observations.

Main Methods:

Development of a statistical model for chain-like aggregate growth and disintegration.
Focus on chain-single particle evolution, neglecting chain-chain interactions.
Application of ferrofluid hydromechanics to study viscosity evolution.

Main Results:

Estimation of the time-dependent distribution function for particle chain lengths.
Successful modeling of ferrofluid viscosity evolution post-shear rate alteration.
Theoretical relaxation time shows good agreement with experimental findings.

Conclusions:

Particle chain ensemble evolution is a primary driver of macroscopic viscoelastic phenomena in ferrofluids.
The proposed statistical model provides a valid framework for understanding ferrofluid rheology.
This work offers insights into the microstructural origins of ferrofluid viscoelasticity.