Abstract
We investigated the restructuring behavior of colloidal aggregates by means of the discrete element method. We used a recently proposed model [V. Becker, H. Briesen, Physical Review E 78 (6) (2008) 061404] for tangential inter-particle forces, capable of supporting bending moments. We extended this model by the capability of supporting torsional moments. The time evolution of the aggregates' radius of gyration was tracked and a power law relation between the number of primary particles and the final radius of gyration was found. For the hydrodynamic drag forces the free-draining approximation is employed. We investigated the quality of the free-draining approximation by fully resolved finite element simulations for small aggregates. We found that the free-draining approximation overestimates the drag forces and we identified the usage of effective shear rates as a possible ansatz for reduced modeling of hydrodynamic forces.
Original language | English |
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Pages (from-to) | 362-372 |
Number of pages | 11 |
Journal | Journal of Colloid and Interface Science |
Volume | 339 |
Issue number | 2 |
DOIs | |
State | Published - 15 Nov 2009 |
Keywords
- Colloidal aggregates
- DEM
- FEM
- Free-draining approximation
- Tangential forces