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Related Experiment Video

Updated: Nov 5, 2025

The Diffusion of Passive Tracers in Laminar Shear Flow

The Diffusion of Passive Tracers in Laminar Shear Flow

Published on: May 1, 2018

Anomalous diffusion in a bench-scale pulsed fluidized bed.

Jonathan E Higham¹, Mehrdad Shahnam², Avinash Vaidheeswaran²

¹University of Liverpool, School of Environmental Sciences, Department of Geography and Planning, Roxby Building, Liverpool, L69 7ZT, United Kingdom.

Physical Review. E

|May 19, 2021

Summary

This summary is machine-generated.

Pulsed fluidized beds exhibit complex dynamics, showing anomalous diffusion and weak ergodicity breaking. These findings characterize the non-equilibrium behavior of driven granular media under pulsed flow conditions.

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Area of Science:

Fluid dynamics
Granular physics
Nonlinear dynamics

Background:

Pulsed fluidized beds are weakly confined systems with complex gas-particle and particle-particle interactions.
Pulsed flow induces harmonic and subharmonic modes, leading to structured bubble patterns at the mesoscale.

Purpose of the Study:

To analyze the microrheology of a bench-scale pulsed fluidized bed.
To investigate anomalous diffusion and ergodicity properties in a driven granular medium.

Main Methods:

Utilizing single-particle tracking to analyze ergodicity and ageing properties.
Examining ensemble-averaged mean-squared displacement scaling and time-averaged mean-squared displacement distributions.

Main Results:

Observed anomalous diffusion at the particle scale, contrasting with mesoscale bubble patterns.
Found that the scaling of ensemble-averaged mean-squared displacement is not unique.
Identified non-Gaussian, asymmetric distributions of time-averaged mean-squared displacements with a trivial contribution from static particles.

Conclusions:

Results indicate weak ergodicity breaking and ageing phenomena.
These characteristics define the nonstationary and out-of-equilibrium dynamics of the pulsed fluidized bed.