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Related Experiment Video

Updated: Jul 3, 2026

The Diffusion of Passive Tracers in Laminar Shear Flow

The Diffusion of Passive Tracers in Laminar Shear Flow

Published on: May 1, 2018

Shear-induced self-diffusion in a wall-bounded dilute suspension.

Evgeny S Asmolov¹

¹Central Aero-Hydrodynamic Institute, Zhukovsky, Moscow Region, 140180, Russia. aes@an.aerocentr.msk.su

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

|July 23, 2008

Summary

Simulations show that particle migration in fluid flow is driven by collective hydrodynamic interactions. The self-diffusivity of particles scales linearly with their concentration, matching experimental findings.

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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

Area of Science:

Fluid Dynamics
Particle Physics
Computational Physics

Background:

Understanding particle migration in fluid suspensions is crucial for various industrial and scientific applications.
Previous studies have explored particle behavior, but the role of collective hydrodynamic interactions in non-Brownian systems requires further investigation.

Purpose of the Study:

To simulate and analyze the random migrations of non-Brownian, neutrally buoyant particles in a dilute suspension.
To investigate the contribution of far-field collective hydrodynamic interactions to particle diffusivity.
To examine the relationship between particle concentration and self-diffusivity in a periodic Couette cell flow.

Main Methods:

Utilized a dipole model for simulating particle migration in a periodic Couette cell.
Focused on dilute suspensions of non-Brownian, neutrally buoyant particles.
Analyzed diffusivity arising from far-field collective hydrodynamic interactions and large-scale concentration fluctuations.

Main Results:

Simulations revealed that large-scale concentration fluctuations induce fluid velocity disturbances.
The induced disturbances have a length scale comparable to the dimensions of the Couette cell.
The calculated self-diffusivity coefficient demonstrated a linear dependence on particle volume content.

Conclusions:

Collective hydrodynamic interactions are a significant factor driving particle diffusivity in this system.
The linear relationship between self-diffusivity and particle concentration provides a key predictive model.
The simulation results align well with existing experimental data, validating the dipole model approach.