Thermal transport characteristics of combined electroosmotic and pressure driven flow in soft nanofluidics.
Thermal transport characteristics of combined electroosmotic and pressure driven flow in soft nanofluidics.
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DOI：
10.1016/j.jcis.2016.05.005
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发表时间：
2016-08
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
本文研究了电解质溶液在具有多电解质壁的狭缝纳米通道（即软纳米通道）中的热输运特性。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透流动的电动效应。聚电解质层（PEL）表示为固定电荷层（FCL），电解质离子可以存在于PEL内部和外部。因此，pel -电解质界面充当半透膜。据我们所知，这种软纳米通道中混合的电动和压力驱动流动的热分析从未得到解决。假设低电位的Debye-Huckel线性化，求解泊松-玻尔兹曼方程，得到守恒方程的解析封闭解。求解守恒方程得到电势；以控制无量纲参数表示的速度和温度分布。同时给出了努塞尔数的计算结果，并进行了详细的讨论。
The present study deals with thermal transport characteristics of an electrolyte solution flowing through a slit nanochannel with polyelectrolyte walls, known as soft nanochannel. 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 impact 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. Therefore, the PEL-electrolyte interface acts as a semi-penetrable membrane. To the best of our knowledge, the thermal analysis of mixed electrokinetically and pressure driven flow in such soft nanochannels has never been addressed. The Poisson-Boltzmann equation is solved assuming the Debye-Huckel 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; velocity and temperature distributions in terms of governing dimensionless parameters. Also results for the Nusselt number are presented and discussed in detail.