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.
Lattanzi, Aaron and Stickel, Jonathan J. "Hopper Flows of Mixtures of Spherical and Rod-Like Particles via the Multisphere Method." AIChE Journal, vol. 66, no. 4, Dec. 2019. https://doi.org/10.1002/aic.16882
Lattanzi, Aaron, & Stickel, Jonathan J (2019). Hopper Flows of Mixtures of Spherical and Rod-Like Particles via the Multisphere Method. AIChE Journal, 66(4). https://doi.org/10.1002/aic.16882
Lattanzi, Aaron, and Stickel, Jonathan J, "Hopper Flows of Mixtures of Spherical and Rod-Like Particles via the Multisphere Method," AIChE Journal 66, no. 4 (2019), https://doi.org/10.1002/aic.16882
@article{osti_1593079,
author = {Lattanzi, Aaron and Stickel, Jonathan J},
title = {Hopper Flows of Mixtures of Spherical and Rod-Like Particles via the Multisphere Method},
annote = {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},
url = {https://www.osti.gov/biblio/1593079},
journal = {AIChE Journal},
number = {4},
volume = {66},
place = {United States},
year = {2019},
month = {12}}
Campbell, Charles S.; Nakagawa, Masami; Luding, Stefan
POWDERS AND GRAINS 2009: PROCEEDINGS OF THE 6TH INTERNATIONAL CONFERENCE ON MICROMECHANICS OF GRANULAR MEDIA, AIP Conference Proceedingshttps://doi.org/10.1063/1.3179996