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Experimental study of small aggregate settling.

Authors
  • Gruy, F
  • Cugniet, P
Type
Published Article
Journal
Journal of colloid and interface science
Publication Date
Apr 15, 2004
Volume
272
Issue
2
Pages
465–471
Identifiers
PMID: 15028512
Source
Medline
License
Unknown

Abstract

The drag coefficient and hydrodynamic radius of particles are important parameters needed in crystallization science. Small aggregates of micrometric primary particles are mainly produced in stirred crystallizers. We present experimental results on the drag coefficient of macroscopic aggregates consisting of glass beads in the number range [2,100]. The drag coefficient is calculated from settling measurements in glycerol in order to preserve the Stokesian nature of typical flow around particles in a crystallizer. We show that the hydrodynamic radius of these aggregates is almost the radius based on the average projected area over all orientations. This result is extended to larger and more porous aggregates.

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