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Flocs in Shear and Strain Flows.
Journal article

Flocs in Shear and Strain Flows.

  • Blaser S Institute of Hydromechanics and Water Resources Management, Swiss Federal Institute of Technology, Zürich, CH-8093, Switzerland
  • 2001-03-20
Published in:
  • Journal of colloid and interface science. - 2000
Colloid and Surface Chemistry
Electronic, Optical and Magnetic Materials
Surfaces, Coatings and Films
Biomaterials
English 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.
Language
  • English
Open access status
closed
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Persistent URL
https://sonar.ch/global/documents/163903
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