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Mixing and charge transfer in a nanofluidic system due to a patterned surface

机译：由于图案化的表面，纳米流体系统中的混合和电荷转移

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In this work, electroosmotic flow mixing enhancement is investigated in a sufficiently long nano-channel with a rectangular nonconducting obstacle mounted on the lower wall with heterogeneous surface electrical potential. A linear pressure drop is observed above the region of patch potential to form a recirculating zone. Formation of vortical flow due to the combined effect of enhanced surface area, heterogeneity in surface potential and external electric field is discussed. A numerical method is adopted based on a finite volume approach to solve the governing coupled Nemst-Planck, Navier-Stokes and Maxwell's equations to describe ion transport, electrical potential distribution and their impact on flow field. It is observed that an increment in patch potential strength and block height increases the species concentration gradient and surface area, respectively, which enhances the diffusive flux resulting in better mixing performance.
机译：在这项工作中，研究了在一个足够长的纳米通道中的电渗流混合增强作用，该通道具有安装在下壁的具有表面不均匀电势的矩形不导电障碍物。在贴片电位区域上方观察到线性压降，以形成再循环区。讨论了由于表面积增加，表面电势的不均匀性和外部电场的综合作用而形成的涡流。采用基于有限体积方法的数值方法来求解控制耦合的Nemst-Planck，Navier-Stokes和Maxwell方程，以描述离子传输，电势分布及其对流场的影响。观察到，斑块电位强度和块高度的增加分别增加了物种浓度梯度和表面积，这增强了扩散通量，从而导致更好的混合性能。

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