| 초록 |
Unlike the conventional flow channels, microfluidic and nanofluidic channels include clearly the electrokinetic influence on its internal transport behavior. In this study, an externally applied body force originated from the long-range electrostatic interaction between the nonlinear Poisson-Boltzmann electric field and the flow-induced electric field is applied in the Navier-Stokes equation of motion. The effects of the electric double layer (EDL), the zeta potential of the solid surface, and the charge condition of the channel wall on the velocity profile as well as the flow-induced streaming potential behavior are examined. Theoretical results emphasize that the velocity profile is definitely affected by the EDL for the cases of low ionic concentrations and high zeta potentials, where the average fluid velocity decreases as the solution ionic concentration decreases. We analyze the influence of the inhomogeneous charge condition upon both the potential and the velocity profiles. Compared to the like-charged case, opposite surface charges present an opposite behavior of the velocity profiles.
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