【摘 要】
：
The exact solutions for the electric potential and electroosmotic flow velocity of salt-free power-law fluids in the planar slit and cylindrical capillary a
【机 构】
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Department of Mechanical Engineering, Far East University, Taiwan
【出 处】
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2016年大连国际微纳流体和微流控芯片大会(2016 International Conference of Micro
论文部分内容阅读
The exact solutions for the electric potential and electroosmotic flow velocity of salt-free power-law fluids in the planar slit and cylindrical capillary are obtained by solving nonlinear Poisson-Boltzmann equation and momentum equation without any restriction on electric double layer and zeta potential [1-3].The variation of nondimensional volumetric flow rate as a function of flow behavior index n for various values of h/λ in the planar slit and cylindrical capillary is shown in Fig.1.The reference flow rate Q0 is that of Newtonian fluids (n=1), h is the distance from the center of geometry to the wall, and λ is the Gouy-Chapman length which defines a layer near the charged surface within which most counterions are localized [4].It is observed that the effect of flow behavior index n on flow rates at h/λ =2.5 is negligible.Furthermore, for h/λ > 2.5, the flow rate is larger for shear thinning fluid (n<1) than that for the shear thickening fluid (n>1); however, this trend is reversed for h/λ < 2.5.The explanation for this behavior is underway.
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