Electrokinetic pumping effects of charged porous media in microchannels   using the lattice Poisson-Boltzmann method

doi:10.1016/j.jcis.2006.08.050

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	Electrokinetic pumping effects of charged porous media in microchannels using the lattice Poisson-Boltzmann method
	Wang, Moran ; Wang, Jinku ; Chen, Shiyi ; Pan, Ning
刊名	胶体与界面科学杂志
	2006
关键词	electrokinetic effect micropump lattice Poisson-Boltzmann method porous media BOUNDARY-CONDITIONS ELECTROPHORETIC MOBILITY ELECTROOSMOTIC PHENOMENA POLYMER MONOLITHS LIQUID FLOW FLUID-FLOWS PRESSURE EQUATION SIMULATIONS MICROPUMP
DOI	10.1016/j.jcis.2006.08.050
英文摘要	The electrokinetic pumping characteristics of nanoscale charged porous media packed in microchannels are investigated using a mesoscopic evolution method. When the pore size of porous media is comparable to the thickness of electric double layer, the effects of particle surface potentials on the bulk electric potential distribution will not be negligible. The lattice Poisson-Boltzmann method provides an accurate numerical solution for such problems, which combines two sets of lattice evolution methods solving the nonlinear Poisson-Boltzmann equation for electric potential distribution and the Navier-Stokes equations for fluid flow, respectively. The effects of the finite particle size, the bulk ionic concentration, the external electric field strength and the surface potentials on the electroosmotic micropump performances are therefore studied. The results show that for a certain porosity the maximum pumping pressure is inversely proportional to the particle diameter and the flow rate under zero pressure drop increases with the particle size. The pumping flow rate decreases with the backpressure yet increases with the external electric field strength, linearly respectively. The averaged flow rate increases with the bulk ionic concentration and the particle surface potential, but is slightly influenced by the surface potentials of channel walls. The numerical results agree with the published experimental data while some results deviate from the predictions based on the macroscopic linear assumptions. (c) 2006 Elsevier Inc. All rights reserved.; Chemistry, Physical; SCI(E); EI; 39; ARTICLE; 1; 246-253; 304
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/251229]
专题	工学院
推荐引用方式 GB/T 7714	Wang, Moran,Wang, Jinku,Chen, Shiyi,et al. Electrokinetic pumping effects of charged porous media in microchannels using the lattice Poisson-Boltzmann method[J]. 胶体与界面科学杂志,2006.
APA	Wang, Moran,Wang, Jinku,Chen, Shiyi,&Pan, Ning.(2006).Electrokinetic pumping effects of charged porous media in microchannels using the lattice Poisson-Boltzmann method.胶体与界面科学杂志.
MLA	Wang, Moran,et al."Electrokinetic pumping effects of charged porous media in microchannels using the lattice Poisson-Boltzmann method".胶体与界面科学杂志 (2006).