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Fluid Mechanics and Transport Phenomena
A proposal for discrete modeling of mechanical effects during drying, combining pore networks with DEM
Article first published online: 16 JUN 2010
DOI: 10.1002/aic.12318
Copyright © 2010 American Institute of Chemical Engineers (AIChE)
Additional Information
How to Cite
Kharaghani, A., Metzger, T. and Tsotsas, E. (2011), A proposal for discrete modeling of mechanical effects during drying, combining pore networks with DEM. AIChE J., 57: 872–885. doi: 10.1002/aic.12318
Publication History
- Issue published online: 10 MAR 2011
- Article first published online: 16 JUN 2010
- Manuscript Revised: 15 MAY 2010
- Manuscript Received: 17 AUG 2009
Funded by
- German Research Foundation (DFG)
- Graduate School 828 “Micro-Macro-Interactions in Structured Media and Particulate Systems”
- Abstract
- Article
- References
- Cited By
Keywords:
- pore network modeling;
- discrete element method;
- multiphase;
- microcracks;
- shrinkage
Abstract
A discrete modeling approach is introduced to investigate the influence of liquid phase distributions on damage and deformation of particle aggregates during convective drying. The approach is illustrated on a simple 3D aggregate structure, in which monosized spherical particles are arranged in a cubic packing and bonded together at their contacts; the mechanical behavior of this aggregate is simulated by discrete element method (DEM). Liquid phase distributions in the void space are obtained from drying simulations for a pore network. In a one-way coupling approach, capillary forces are computed over time from the filling state of pores and applied as loads on each particle in DEM. A nonlinear bond model is used to compute interparticular forces. Simulations are conducted for various drying conditions and for aggregates with different mechanical properties. Microcracks induced by bond breakage are observed in stiff material, whereas soft material tends to shrink reversibly without damage. © 2010 American Institute of Chemical Engineers AIChE J, 2011