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Article

Calibration of Discrete-Element-Method Parameters for Cohesive Materials Using Dynamic-Yield-Strength and Shear-Cell Experiments

1
Department of Chemical and Biochemical Engineering, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA
2
School of Chemical Engineering, Purdue University, West Lafayette, IN 47907, USA
3
School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907, USA
4
BASF Corporation, Beachwood, OH 23700, USA
5
BASF Corporation, 67056 Ludwigshafen, Germany
*
Author to whom correspondence should be addressed.
Current address: USFDA, Silver Spring, Maryland, USA.
Current address: Tokyo Electron US Holdings, Inc., New York, NY, USA.
Processes 2019, 7(5), 278; https://doi.org/10.3390/pr7050278
Received: 4 April 2019 / Revised: 29 April 2019 / Accepted: 2 May 2019 / Published: 13 May 2019
(This article belongs to the Special Issue Recent Advances in Population Balance Modeling)
This study tested the effectiveness of using dynamic yield strength (DYS) and shear-cell experiments to calibrate the following discrete-element-method (DEM) parameters: surface energy, and the coefficients of sliding and rolling friction. These experiments were carried out on cohesive granules, and DEM models were developed for these experiment setups using the JKR cohesion contact model. Parameter-sensitivity analysis on the DYS model showed that the DYS results in the simulations were highly sensitive to surface energy and were also impacted by the values of the two friction coefficients. These results indicated that the DYS model could be used to calibrate the surface energy parameter once the friction coefficients were fixed. Shear-cell sensitivity analysis study found that the influence of surface energy on the critical-state shear value cannot be neglected. It was inferred that the shear-cell model has to be used together with the DYS model to identify the right set of friction parameters. Next, surface energy was calibrated using DYS simulations for a chosen set of friction parameters. Calibrations were successfully conducted for simulations involving experimentally sized particles, scaled-up particles, a different shear modulus, and a different set of friction parameters. In all these cases, the simulation DYS results were found to be linearly correlated with surface energy and were within 5% of the experimental DYS result. Shear-cell simulations were then used to compare calibrated surface-energy values for the scaled-up particles with the experimentally sized particles. Both the simulations resulted in similar critical-state shear values. Finally, it was demonstrated that a combination of DYS and shear-cell simulations could be used to compare two sets of friction parameters and their corresponding calibrated surface energy values to identify the set of parameters that better represent the flow behavior demonstrated by the experimental system. View Full-Text
Keywords: discrete-element method; dynamic yield strength; shear cell; calibration; cohesion; JKR model discrete-element method; dynamic yield strength; shear cell; calibration; cohesion; JKR model
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MDPI and ACS Style

Karkala, S.; Davis, N.; Wassgren, C.; Shi, Y.; Liu, X.; Riemann, C.; Yacobian, G.; Ramachandran, R. Calibration of Discrete-Element-Method Parameters for Cohesive Materials Using Dynamic-Yield-Strength and Shear-Cell Experiments. Processes 2019, 7, 278. https://doi.org/10.3390/pr7050278

AMA Style

Karkala S, Davis N, Wassgren C, Shi Y, Liu X, Riemann C, Yacobian G, Ramachandran R. Calibration of Discrete-Element-Method Parameters for Cohesive Materials Using Dynamic-Yield-Strength and Shear-Cell Experiments. Processes. 2019; 7(5):278. https://doi.org/10.3390/pr7050278

Chicago/Turabian Style

Karkala, Subhodh, Nathan Davis, Carl Wassgren, Yanxiang Shi, Xue Liu, Christian Riemann, Gary Yacobian, and Rohit Ramachandran. 2019. "Calibration of Discrete-Element-Method Parameters for Cohesive Materials Using Dynamic-Yield-Strength and Shear-Cell Experiments" Processes 7, no. 5: 278. https://doi.org/10.3390/pr7050278

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