Anomalous diffusion in a bench-scale pulsed fluidized bed

Jonathan E. Higham, Mehrdad Shahnam, and Avinash Vaidheeswaran
Phys. Rev. E 103, 043103 – Published 12 April 2021

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.

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  • Received 11 December 2020
  • Accepted 23 March 2021

DOI:https://doi.org/10.1103/PhysRevE.103.043103

©2021 American Physical Society

Physics Subject Headings (PhySH)

Fluid DynamicsStatistical Physics & ThermodynamicsNonlinear Dynamics

Authors & Affiliations

Jonathan E. Higham

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

Mehrdad Shahnam and Avinash Vaidheeswaran*

  • National Energy Technology Laboratory 3610 Collins Ferry Road, Morgantown, West Virginia 26505, USA

  • *avinash.vaidheeswaran@netl.doe.gov

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Issue

Vol. 103, Iss. 4 — April 2021

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