Combined electroosmotically and pressure driven flow in soft nanofluidics.
Combined electroosmotically and pressure driven flow in soft nanofluidics.
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DOI：
10.1016/j.jcis.2015.08.070
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发表时间：
2015-12
影响因子：
9.9
通讯作者：
M. H. Matin;H. Ohshima
中科院分区：
文献类型：
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作者：
M. H. Matin;H. Ohshima
本研究致力于分析通过软带电纳米通道的混合电渗和压力驱动流，考虑边界滑移和狭缝通道壁上的恒定电荷密度。流体流动的来源是沿通道轴的压力梯度和在均匀施加的电场的影响下触发电渗流的动电效应。聚电解质层（PEL）被表示为固定电荷层（FCL），电解质离子可以存在于 PEL 的内部和外部，即 PEL-电解质界面充当半渗透膜。泊松-玻尔兹曼方程的求解假设对低电势进行德拜-许克尔线性化，为我们提供了守恒方程的解析封闭式解。求解守恒方程以获得控制无量纲参数的电势和速度分布。无量纲电势、无量纲速度和泊肃叶数的结果以图形方式呈现并详细讨论。
The present study is devoted to the analysis of mixed electroosmotic and pressure driven flows through a soft charged nanochannel considering boundary slip and constant charge density on the walls of the slit channel. The sources of the fluid flow are the pressure gradient along the channel axis and the electrokinetic effects that trigger an electroosmotic flow under the influence of a uniformly applied electric field. The polyelectrolyte layer (PEL) is denoted as a fixed charge layer (FCL) and the electrolyte ions can be present both inside and outside the PEL i.e., the PEL–electrolyte interface acts as a semi-penetrable membrane. The Poisson–Boltzmann equation is solved assuming the Debye–Hückel linearization for the low electric potential to provide us with analytical closed form solutions for the conservation equations. The conservation equations are solved to obtain the electric potential and velocity distributions in terms of governing dimensionless parameters. The results for the dimensionless electric potential, the dimensionless velocity and Poiseuille number are presented graphically and discussed in detail.