Shear-Induced Flocculation of Colloidal Particles in Stirred Tanks

Journal of Colloid and Interface Science
C J ChinCostas Tsouris

Abstract

Colloidal polystyrene and paramagnetic particles consisting of mixtures of polystyrene and magnetite are used to experimentally investigate flocculation kinetics in a stirred tank under turbulent shear flow. The effects of various parameters-agitation speed, solution pH, ionic strength, particle size, and particle concentration-on the flocculation rate are investigated. A trajectory model applicable for shear-flow systems is formulated to describe particle flocculation in stirred tanks. The collision efficiency of particles is obtained from the limiting trajectory of one particle moving toward another and is a function of interparticle forces and flow properties. The collision frequency is determined as a function of particle size and energy dissipation. The flocculation frequency is then determined by multiplying the collision frequency by the collision efficiency and is incorporated into a population balance model to predict the particle size evolution. Results suggest that the flocculation rate is enhanced by increasing the agitation speed, even though the collision efficiency is decreased at a higher agitation speed. It is also found that the collision rate increases and the collision efficiency decreases as the particle si...Continue Reading

References

Mar 1, 1968·Journal of Pharmaceutical Sciences·N F Ho, W I Higuchi
Dec 1, 1996·Journal of Colloid and Interface Science·P T SpicerS E Pratsinis
Dec 25, 1996·Journal of Colloid and Interface Science·Sotira YiacoumiCostas Tsouris
Mar 1, 1997·Proceedings of the Society for Experimental Biology and Medicine·J L Wallace, B C Chin

Citations

Nov 18, 2006·Journal of Colloid and Interface Science·R Wengeler, H Nirschl
Dec 4, 2004·Journal of Colloid and Interface Science·E BrunetP Tabeling
Dec 7, 2013·Environmental Science & Technology·Yong-Ha KimCostas Tsouris
Oct 4, 2017·Nanoscale·Sonia García-JimenoSándalo Roldán-Vargas

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