Journal
JOURNAL OF NON-NEWTONIAN FLUID MECHANICS
Volume 133, Issue 2-3, Pages 99-108Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jnnfm.2005.10.012
Keywords
interactions spheres; yield stress fluid; drag
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The drag force on two spheres moving, at very low controlled velocity in a viscoplastic fluid was studied as a function of the distance separating them. Two configurations were studied, namely two spheres with their centre lines along or perpendicular to the flow. The influence of the surface roughness of the spheres governing fluid adherence and slip at the wall was quantified. The drag force on an isolated sphere was also measured and used as a reference. Correlations for predicting the drag coefficient and stability criterion, with respect to sedimentation. are proposed. These results show that viscoplasticity reduces the extent of the interactions in comparison with the case of a Newtonian fluid. (c) 2005 Elsevier B.V. All rights reserved.
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