Numerical 2D models of consolidation of dense flocculated suspensions
2001 (English)In: Journal of Engineering Mathematics, ISSN 0022-0833, E-ISSN 1573-2703, Vol. 41, no 2-3, 189-201 p.Article in journal (Refereed) Published
A mathematical 2D model for a consolidation process of a highly concentrated, flocculated suspension is developed. The suspension is treated as a mixture of a fluid and solid particles by an Eulerian two-phase fluid model. The suspension is characterized by constitutive relations correlating the stresses, interaction forces, and inter-particle forces to concentration and velocity gradients. This results in three empirical material functions: a permeability, a non-Newtonian viscosity and a non-reversible particle interaction pressure. Parameters in the models are fitted to experimental data. A simulation program using finite difference methods both in time and space is applied to one and two dimensional test cases. The effect of different viscosity models as well as the effect of shear on consolidation rate is studied. The results show that a shear thinning viscosity model yields a higher consolidation rate compared to a model that only depends on the volume fraction. It is also concluded that the size of the viscosity influences the time scale of the process and that the expected effect of shear on the process is not weil reproduced with any of the models.
Place, publisher, year, edition, pages
2001. Vol. 41, no 2-3, 189-201 p.
consolidation, flocculated suspension, Eulerian two-fluid model, shear thinning, numerical simulations
IdentifiersURN: urn:nbn:se:kth:diva-20981DOI: 10.1023/A:1011951614241ISI: 000171293200005OAI: oai:DiVA.org:kth-20981DiVA: diva2:339678
QC 201005252010-08-102010-08-102016-04-20Bibliographically approved