A collision efficiency model for flow-induced coagulation of fractal aggregates
2008 (English)In: AIChE Journal, ISSN 0001-1541, E-ISSN 1547-5905, Vol. 54, no 7, 1748-1760 p.Article in journal (Refereed) Published
A model for flow-induced collisions of fractal aggregates is developed. The model is based on the analysis of the relative trajectories between a pair of aggregates that takes into account their hydrodynamic and their colloidal interactions. Regarding the former, the aggregates are modeled as permeable spheres where the Brinkman equation is used to describe the flow inside the aggregates. Interparticle forces are incorporated by considering the forces between the primary particles in the two aggregates that are the nearest. The model results in a collision efficiency that depends on the masses of the colliding aggregates, the fractal dimension, and a nondimensional Hamaker constant characterizing the interparticle forces. The collision efficiency model is used to investigate the dynamics of a suspension undergoing coagulation. Significant deviations with respect to existing collision efficiency models are evidenced.
Place, publisher, year, edition, pages
2008. Vol. 54, no 7, 1748-1760 p.
colloidal aggregation, relative trajectories, hydrodynamic interaction, permeability, population balance equations
Chemical Process Engineering
IdentifiersURN: urn:nbn:se:kth:diva-87897DOI: 10.1002/aic.11496ISI: 000257040300006OAI: oai:DiVA.org:kth-87897DiVA: diva2:502010
QC 201202142012-02-142012-02-142012-02-14Bibliographically approved