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Title: Investigation of the influence of frictional viscosity regularization on quasi-static gas-solid flow predictions in a conical spouted bed with non-porous draft tube

Abstract

The stress in the quasi-static particle flow is often modeled through the Mohr-Coulomb failure criterion. In the extension to complex three-dimensional flows, a granular viscosity is introduced through a tensorial rheology and the deviatoric frictional stress tensor is assumed aligned with the strain rate tensor. This granular viscosity is singular as the shear rate approaches zero, regardless of the local rheology. We discuss the influence of regularizing such a frictional viscosity on the particle circulation rate and other measured characteristics in a laboratory scale draft tube spouted bed. Here, the friction between particles is modeled either with a constant Coulomb rheology or using a local particle pressure and strain-rate based friction known as μ( I)-rheology. The predictions appear very dependent on the regularization parameter introduced by the method. The mean properties of the flow (e.g. circulation and pressure drop) monotonically converge towards the measurements when the regularization parameter tends to zero. In other respects, the two regularization models regarded in this study induced similar hydrodynamics within the spouted bed of interest. But the analysis of the conditional averages of the inertial number and the fraction of the solids in the quasi-static regime shows that the extent and staticity of themore » quasi-static region is sensitive to changes to the regularization parameter or regularization function.« less

Authors:
 [1];  [2]
  1. National Energy Technology Lab. (NETL), Morgantown, WV (United States); West Virginia Univ., Morgantown, WV (United States)
  2. National Energy Technology Lab. (NETL), Morgantown, WV (United States)
Publication Date:
Research Org.:
National Energy Technology Lab. (NETL), Morgantown, WV (United States)
Sponsoring Org.:
FE; USDOE
OSTI Identifier:
1509703
Report Number(s):
NETL-PUB-22321
Journal ID: ISSN 0921-8831
Resource Type:
Accepted Manuscript
Journal Name:
Advanced Powder Technology
Additional Journal Information:
Journal Volume: 29; Journal Issue: 12; Journal ID: ISSN 0921-8831
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
Frictional flow; Viscosity regularization; Inertial number μ(I)-rheology; Spouted bed

Citation Formats

Konan, N’dri A., and Huckaby, E. David. Investigation of the influence of frictional viscosity regularization on quasi-static gas-solid flow predictions in a conical spouted bed with non-porous draft tube. United States: N. p., 2018. Web. doi:10.1016/j.apt.2018.09.005.
Konan, N’dri A., & Huckaby, E. David. Investigation of the influence of frictional viscosity regularization on quasi-static gas-solid flow predictions in a conical spouted bed with non-porous draft tube. United States. doi:10.1016/j.apt.2018.09.005.
Konan, N’dri A., and Huckaby, E. David. Tue . "Investigation of the influence of frictional viscosity regularization on quasi-static gas-solid flow predictions in a conical spouted bed with non-porous draft tube". United States. doi:10.1016/j.apt.2018.09.005. https://www.osti.gov/servlets/purl/1509703.
@article{osti_1509703,
title = {Investigation of the influence of frictional viscosity regularization on quasi-static gas-solid flow predictions in a conical spouted bed with non-porous draft tube},
author = {Konan, N’dri A. and Huckaby, E. David},
abstractNote = {The stress in the quasi-static particle flow is often modeled through the Mohr-Coulomb failure criterion. In the extension to complex three-dimensional flows, a granular viscosity is introduced through a tensorial rheology and the deviatoric frictional stress tensor is assumed aligned with the strain rate tensor. This granular viscosity is singular as the shear rate approaches zero, regardless of the local rheology. We discuss the influence of regularizing such a frictional viscosity on the particle circulation rate and other measured characteristics in a laboratory scale draft tube spouted bed. Here, the friction between particles is modeled either with a constant Coulomb rheology or using a local particle pressure and strain-rate based friction known as μ(I)-rheology. The predictions appear very dependent on the regularization parameter introduced by the method. The mean properties of the flow (e.g. circulation and pressure drop) monotonically converge towards the measurements when the regularization parameter tends to zero. In other respects, the two regularization models regarded in this study induced similar hydrodynamics within the spouted bed of interest. But the analysis of the conditional averages of the inertial number and the fraction of the solids in the quasi-static regime shows that the extent and staticity of the quasi-static region is sensitive to changes to the regularization parameter or regularization function.},
doi = {10.1016/j.apt.2018.09.005},
journal = {Advanced Powder Technology},
number = 12,
volume = 29,
place = {United States},
year = {2018},
month = {9}
}

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Figures / Tables:

Figure 1 Figure 1: Sketch of the spouted bed reactor of Nagashima et al. (2009).$H$ refers to as the gap between the draft tube and the spout inlet. The arrows with ∆PS and ∆PDT show the locations of the measurements of the bed and draft tube pressure drops, res ectively.

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