Electrophoresis of a rigid sphere in a Carreau fluid normal to a planar surface
Resource
Journal of Colloid and Interface Science 285(2005), 857â 864
Journal
Journal of Colloid and Interface Science 285(2005), 857â 864
Pages
-
Date Issued
2005
Date
2005
Author(s)
DOI
246246/2006111501275382
Abstract
The boundary effect on electrophoresis is investigated by considering the electrophoresis of a spherical particle in a non-Newtonian fluid
normal to a planar surface under conditions of low surface potential and weak applied electric field. The Carreau model, which is widely
used for the description of polymeric fluids of shear-thinning nature, is adopted to simulate the non-Newtonian behavior of the fluid. We
show that, in general, shear thinning has the effect of raising the electrophoretic mobility of a particle. The thinner the double layer, the more
significant this effect is, and, since the presence of the planar surface has the effect of enhancing the shear-thinning effect, the closer a particle
is to the planar surface, the larger is its mobility. Both the shear rate and the viscosity of the fluid vary most significantly in the gap between
the particle and the planar surface, and the maximal shear rate and the minimal viscosity occur on the particle surface.
Subjects
Electrophoresis
Boundary effect
Sphere normal to plane
Non-Newtonian fluid
Carreau model
Publisher
Taipei:National Taiwan University Dept Chem Engn
Type
journal article
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