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-.
Text
Anomalous_Diffusion_in_a_Small_Scale_Pulsed_Fluidized_Bed.pdf - Author Accepted Manuscript Download (5MB) | Preview |
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 |
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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 |