Segregation of cohesive granular materials during discharge from a rectangular hopper |
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Authors: | Anshu Anand Jennifer S Curtis Carl R Wassgren Bruno C Hancock William R Ketterhagen |
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Affiliation: | 1. Chemical Engineering Department, University of Florida, Bldg. No. 723, Room 216, Gainesville, FL, 32611, USA 2. School of Mechanical Engineering, Purdue University, West Lafayette, IN, 47907, USA 3. Pfizer Global Research and Development, Groton, CT, 06340, USA
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Abstract: | Granular materials may readily segregate due to differences in particle properties such as size, shape, and density. Segregation
is common in industrial processes involving granular materials and can occur even after a material has been uniformly blended.
The specific objective of this work is to investigate via simulation the effect of particle cohesion due to liquid bridging
on particle segregation. Specifically, a bi-disperse granular material flowing from a 3-D hopper is simulated using the discrete
element method (DEM) for cohesive particles and the extent of discharge segregation is characterized over time. The cohesion
between the particles is described by a pendular liquid bridge force model and the strength of the cohesive bond is characterized
by the Bond number determined with respect to the smaller particle species. As the Bond number of the system increases, the
extent of discharge segregation in the system decreases. A critical value of Bo = 1 is identified as the condition where the primary mechanism of segregation in the cohesionless hopper system, i.e. gravity-induced percolation, is essentially eliminated due to the liquid bridges between particles. |
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