✦ LIBER ✦

Flocs in Shear and Strain Flows

✍ Scribed by Stefan Blaser

Publisher: Elsevier Science
Year: 2000
Tongue: English
Weight: 403 KB
Volume: 225
Category: Article
ISSN: 0021-9797
DOI: 10.1006/jcis.1999.6671

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✦ Synopsis

Preflocculated ferric hydroxide flocs were subjected to either a simple shear flow or a two-dimensional straining flow, and their motion was optically observed. Digital image analysis was applied to extract information on orientation and deformation from the digitized frames. It was found that the simple shear flow led to a rotation of the flocs whose motion can be understood from the behavior of a solid ellipsoid. In the extensional flow, no continuous rotation occurred and flocs were broken apart along the axis of straining. The rupture forces estimated from an ellipsoid model were found to be in the range of 0.1 N/m(2). Copyright 2000 Academic Press.

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