Electrophoretic Behavior of a Spherical Colloidal Particle to a Plane in Carreau Fluid
Date Issued
2004
Date
2004
Author(s)
Chen, Chi-Tien
DOI
zh-TW
Abstract
In this study, we investigated the electrophoretic behavior of a charged spherical colloidal particle in polymeric fluid with the presence of a planar surface. We adopted Carreau model to describe the polymeric fluid, which is widely used on describing polymeric fluid with shear-thinning nature. The corresponding electrokinetic equations are further linearized based on the assumptions of low zeta potential and weak applied field, and solved simultaneously by pseudo-spectral method.
We found several interesting phenomena which can not be observed in typical Newtonian cases. For instance, under lower (the power law exponent) or higher (the relaxation time constant), the higher the mobility. This is because the fluid property deviates from Newtonian, the shear thinning nature is more obvious. On the other hand, the closer the planar surface to the colloidal is, the mobility will become higher than that in the case of Newtonian fluid. This is because the shear-thinning effect is enhanced by the presence of the boundary.
Subjects
邊界效應
電雙層
電泳速度
卡羅流體
剪力稀薄
double layer
boundary effect
shear thinning
Carreau fluid
electrophoretic mobility
Type
thesis
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