Fluidization of elongated particles—Effect of multi‐particle correlations for drag, lift, and torque in CFD‐DEM

• Published in: AIChE journal Vol. 67; no. 5; pp. e17157 - n/a
• Main Authors: Mema, Ivan, Padding, Johan T.
• Format: Journal Article
• Language: English
• Published: Hoboken, USA John Wiley & Sons, Inc 01-05-2021; American Institute of Chemical Engineers
• Subjects: Aspect ratio; CFD‐DEM; Correlation; Drag; Elongation; Fluidization; fluidized bed; Fluidized beds; hydrodynamic torque; lift force; multi‐particle correlations; nonspherical particles; Particle Technology and Fluidization; Particle tracking; Simulation; Torque; Vertical orientation; hydrodynamic torque; lift force; CFD‐DEM; multi‐particle correlations; nonspherical particles; fluidized bed
• ISSN: 0001-1541; 1547-5905
• DOI: 10.1002/aic.17157

Having proper correlations for hydrodynamic forces is essential for successful CFD‐DEM simulations of a fluidized bed. For spherical particles in a fluidized bed, efficient correlations for predicting the drag force, including the crowding effect caused by surrounding particles, are already available and well tested. However, for elongated particles, next to the drag force, the lift force, and hydrodynamic torque also gain importance. In this work, we apply recently developed multi‐particle correlations for drag, lift and torque in CFD‐DEM simulations of a fluidized bed with spherocylindrical particles of aspect ratio 4 and compare them to simulations with widely used single‐particle correlations for elongated particles. Simulation results are compared with previous magnetic particle tracking experimental results. We show that multi‐particle correlations improve the prediction of particle orientation and vertical velocity. We also show the importance of including hydrodynamic torque.