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Dense versus dilute fluidization of cohesive particles: Reverse sensitivity to friction and restitution coefficient

Peiyuan Liu, Casey Q. LaMarche, Kevin M. Kellogg, and Christine M. Hrenya

  • Department of Chemical and Biological Engineering, University of Colorado Boulder, Boulder, Colorado 80309, USA

  • Corresponding author: hrenya@colorado.edu
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Phys. Rev. Fluids 2, 054302 – Published 31 May, 2017

DOI: https://doi.org/10.1103/PhysRevFluids.2.054302

Abstract

Numerical simulations based on DEM-CFD were conducted to study the behavior of gas-solid flows of cohesive particles under various values of particle friction and restitution coefficient, which dictate the energy dissipation in the tangential and normal directions of particle relative motion. Fluidized beds and riser flows were selected as typical systems for dense and dilute flows, respectively. Based on the defluidization curves and agglomerate properties in respective systems, a reverse dependence on friction and restitution coefficient was identified: defluidization curves were dominated by friction while agglomerates in riser flow were governed by the restitution coefficient. The reverse sensitivity is ascribed to the difference in particle interactions for the two systems. In the fluidized bed, particles primarily interact via enduring multiple-particle contacts, in which the dynamics in the tangential directions dominates. In riser flows, the instantaneous binary collisions are more common and the relative motion of particles in the normal direction becomes important. A nonmonotonic response of defluidization curves to varying sliding friction was observed, which is explained by the competing effects of increased sliding and enhanced spin of particles on bed porosity. This study highlights the importance of correct experimental measurement of solid properties for numerical simulations. The results are also useful for driving the development of continuum modeling of gas-solid flows of cohesive particles.

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Phys. Rev. Fluids 2, 054302– Published 31 May, 2017
  • Received 29 June 2016
Article part of CHORUS

©2017 American Physical Society

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