The settling of fine cohesive powders

Citation
Jm. Valverde et al., The settling of fine cohesive powders, EUROPH LETT, 54(3), 2001, pp. 329-334
Citations number
8
Categorie Soggetti
Physics
Journal title
EUROPHYSICS LETTERS
ISSN journal
02955075 → ACNP
Volume
54
Issue
3
Year of publication
2001
Pages
329 - 334
Database
ISI
SICI code
0295-5075(200105)54:3<329:TSOFCP>2.0.ZU;2-Z
Abstract
We investigate the settling of an initially fluidized bed of a ne cohesive powder. Experimental results on the sedimentation rate cannot be fitted by theoretical and empirical equations existing in the literature and derived for non-cohesive spheres. We extend these equations to account for the adhe sion-induced aggregation of ne particles. The number of particles per aggre gate N and the ratio of aggregate radius R to particle radius, a, have been chosen as fitting parameters. Results from two independent approaches are in very good agreement with the experimental data for approximately the sam e values of N and R. Pictures taken from the fluidized bed show that the av erage aggregate radius matches the predicted one.