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Title: Hopper Flows of Mixtures of Spherical and Rod-Like Particles via the Multisphere Method

Abstract

The discharge of granular media from hoppers plays a vital role in many solids handling operations. The dynamic flow of poly-disperse nonspherical particles differs markedly from mono-disperse spheres and highlights the need to rigorously account for particle shape effects. The multisphere discrete element method (MS-DEM) was utilized here to examine the bulk packing fraction, discharge rate, collisional stress tensor, and order parameter of a bi-disperse sphere-rod mixture evacuating a hopper. A modified form of the Myers and Sellers correlation with variable shape factor is capable of replicating the MS-DEM discharge data. The collisional stress tensor is observed to be highly symmetric for mono-disperse spheres but becomes asymmetric when rod-like particles are introduced. The order parameter within the hopper increases significantly during discharge and the rod-like particles undergo shear induced alignment with their long dimensions orthogonal to the outflow plane.

Authors:
 [1]; ORCiD logo [1]
  1. National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Bioenergy Technologies Office (EE-3B)
OSTI Identifier:
1593079
Report Number(s):
NREL/JA-2700-74572
DOE Contract Number:  
AC36-08GO28308
Resource Type:
Journal Article
Journal Name:
AIChE Journal
Additional Journal Information:
Journal Name: AIChE Journal
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; discrete element method; hopper flow; multisphere

Citation Formats

Lattanzi, Aaron, and Stickel, Jonathan J. Hopper Flows of Mixtures of Spherical and Rod-Like Particles via the Multisphere Method. United States: N. p., 2019. Web. doi:10.1002/aic.16882.
Lattanzi, Aaron, & Stickel, Jonathan J. Hopper Flows of Mixtures of Spherical and Rod-Like Particles via the Multisphere Method. United States. doi:10.1002/aic.16882.
Lattanzi, Aaron, and Stickel, Jonathan J. Mon . "Hopper Flows of Mixtures of Spherical and Rod-Like Particles via the Multisphere Method". United States. doi:10.1002/aic.16882.
@article{osti_1593079,
title = {Hopper Flows of Mixtures of Spherical and Rod-Like Particles via the Multisphere Method},
author = {Lattanzi, Aaron and Stickel, Jonathan J},
abstractNote = {The discharge of granular media from hoppers plays a vital role in many solids handling operations. The dynamic flow of poly-disperse nonspherical particles differs markedly from mono-disperse spheres and highlights the need to rigorously account for particle shape effects. The multisphere discrete element method (MS-DEM) was utilized here to examine the bulk packing fraction, discharge rate, collisional stress tensor, and order parameter of a bi-disperse sphere-rod mixture evacuating a hopper. A modified form of the Myers and Sellers correlation with variable shape factor is capable of replicating the MS-DEM discharge data. The collisional stress tensor is observed to be highly symmetric for mono-disperse spheres but becomes asymmetric when rod-like particles are introduced. The order parameter within the hopper increases significantly during discharge and the rod-like particles undergo shear induced alignment with their long dimensions orthogonal to the outflow plane.},
doi = {10.1002/aic.16882},
journal = {AIChE Journal},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {12}
}

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