Effect of electrical double layer on electric conductivity and pressure drop in a pressure-driven microchannel flow.

Biomicrofluidics
Heng BanZhuorui Song

Abstract

The effect of an electrical double layer (EDL) on microchannel flow has been studied widely, and a constant bulk electric conductivity is often used in calculations of flow rate or pressure drop. In our experimental study of pressure-driven micropipette flows, the pipette diameter is on the same order of magnitude as the Debye length. The overlapping EDL resulted in a much higher electric conductivity, lower streaming potential, and lower electroviscous effect. To elucidate the effect of overlapping EDL, this paper developed a simple model for water flow without salts or dissolved gases (such as CO(2)) inside a two-dimensional microchannel. The governing equations for the flow, the Poisson, and Nernst equations for the electric potential and ion concentrations and the charge continuity equation were solved. The effects of overlapping EDL on the electric conductivity, velocity distribution, and overall pressure drop in the microchannel were quantified. The results showed that the average electric conductivity of electrolyte inside the channel increased significantly as the EDL overlaps. With the modified mean electric conductivity, the pressure drop for the pressure-driven flow was smaller than that without the influence of the ...Continue Reading

References

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Citations

Oct 8, 2011·Journal of Colloid and Interface Science·Dalton J E HarvieMalcolm R Davidson
Nov 10, 2012·Journal of Colloid and Interface Science·Dalei Jing, Bharat Bhushan
Nov 30, 2018·Physical Chemistry Chemical Physics : PCCP·Majid RezaeiAhmad Reza Pishevar
Aug 27, 2011·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Siddhartha Das, Suman Chakraborty
Jan 7, 2016·Beilstein Journal of Nanotechnology·Dalei Jing, Bharat Bhushan
Aug 28, 2014·Beilstein Journal of Nanotechnology·Yunlu PanXuezeng Zhao
Jan 27, 2019·Scientific Reports·Abraham Mansouri, Larry Kostiuk
Jun 11, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Koichiro AsanoTsuyoshi Minami

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