Electrophoresis of a finite rod along the axis of a long cylindrical microchannel filled with Carreau fluids
Electrophoresis of a finite rod along the axis of a long cylindrical microchannel filled with Carreau fluids
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DOI：
10.1007/s10404-008-0390-5
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发表时间：
2009-01
影响因子：
2.8
通讯作者：
L. Yeh;J. Hsu
中科院分区：
文献类型：
--
作者：
L. Yeh;J. Hsu
通过考虑沿着充满剪切稀化卡罗流体（包括牛顿流体和幂律流体作为特例）的圆柱形微通道的轴的有限杆的电泳，研究了非牛顿流体中粒子电泳行为的边界效应。在低表面电势和弱外加电场的条件下，研究了微通道半径、棒的长宽比、双层厚度以及Carreau流体的性质对棒的迁移率的影响。我们表明，由于剪切稀化效应，当前情况下杆的移动性可以明显大于相应的牛顿情况下的移动性；前者对双层厚度的变化比后者更敏感，并且两者之间的差异随着双层厚度的减小而增大。在以下条件下剪切稀化效应很重要：双层很薄，边界效应很重要，和/或长径比很大。我们表明，增加纵横比可以提高或降低其迁移率，这是以前未发现的，并且可以在电泳测量中发挥重要作用。
The boundary effect on the electrophoretic behavior of a particle in a non-Newtonian fluid is studied by considering the electrophoresis of a finite rod along the axis of a cylindrical microchannel filled with shear-thinning Carreau fluids, which include both Newtonian and power-law fluids as special cases. Under the conditions of low surface potential and weak applied electric field, the influences of the radius of the microchannel, the aspect ratio of the rod, the thickness of double layer, and the nature of the Carreau fluid on the mobility of the rod are investigated. We show that due to the shear-thinning effect, the mobility of the rod in the present case can be significantly larger than that in the corresponding Newtonian case; the former is more sensitive to the variation in the thickness of double layer than the latter, and the difference between the two increases with decreasing thickness of double layer. The shear-thinning effect is important under the following conditions: the double layer is thin, the boundary effect is important, and/or the aspect ratio is large. We show that increasing the aspect ratio can either raise or lessen its mobility, which is not found previously, and can play an important role in electrophoresis measurement.