Anomalous diffusion in a bench-scale pulsed fluidized bed



Higham, Jonathan E ORCID: 0000-0001-7577-0913, Shahnam, Mehrdad and Vaidheeswaran, Avinash
(2021) Anomalous diffusion in a bench-scale pulsed fluidized bed. PHYSICAL REVIEW E, 103 (4). 043103-.

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Abstract

We present our analysis on microrheology of a bench-scale pulsed fluidized bed, which represents a weakly confined system. Nonlinear gas-particle and particle-particle interactions resulting from pulsed flow are associated with harmonic and subharmonic modes. While periodic structured bubble patterns are observed at the mesoscale, particle-scale measurements reveal anomalous diffusion in the driven granular medium. We use single-particle tracks to analyze ergodicity and ageing properties at two pulsing frequencies having remarkably different mesoscale features. The scaling of ensemble-averaged mean-squared displacement is not unique. The distribution of time-averaged mean-squared displacements is non-Gaussian, asymmetric, and has a finite trivial contribution from particles in crowded quasistatic surroundings. Results indicate weak ergodicity breaking, which along with ageing characterizes the nonstationary and out-of-equilibrium dynamics.

Item Type: Article
Divisions: Faculty of Science and Engineering > School of Environmental Sciences
Depositing User: Symplectic Admin
Date Deposited: 28 Apr 2021 15:15
Last Modified: 18 Jan 2023 22:50
DOI: 10.1103/PhysRevE.103.043103
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3120873