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Abstract
The problem of water shortage needs to be solved urgently. The membrane-embedded microchannel structure based on the ion concentration polarization (ICP) desalination effect is a potential portable desalination device with low energy consumption and high efficiency. The electroosmotic flow in the microchannel of the cation exchange membrane and the desalination effect of the system are numerically analyzed. The results show that when the horizontal electric field intensity is 2 kV/m and the transmembrane voltage is 400 mV, the desalting efficiency reaches 97.3%. When the electric field strength increases to 20 kV/m, the desalination efficiency is reduced by 2%. In terms of fluid motion, under the action of the transmembrane voltage, two reverse eddy currents are formed on the surface of the membrane due to the opposite electric field and pressure difference on both sides of the membrane, forming a pumping effect. The electromotive force in the channel exhibits significant pressure-flow characteristics with a slip boundary at a speed approximately six times that of a non-membrane microchannel.
Highlights
In 1809, Reuss [1] first discovered the electroosmotic flow (EOF) phenomenon in an experiment
In the late 19th century, Helmholt [2] first introduced the concept of the electrical double layer (EDL), which links the electric field, fluid flow, and ion concentration to describe the formation mechanism of the EOF in detail
When the ion concentration in the Debye layer is constant, the fluid velocity of the EOF is linearly related to the applied horizontal electric field
Summary
In 1809, Reuss [1] first discovered the electroosmotic flow (EOF) phenomenon in an experiment. In the late 19th century, Helmholt [2] first introduced the concept of the electrical double layer (EDL), which links the electric field, fluid flow, and ion concentration to describe the formation mechanism of the EOF in detail. When the applied electric field destroys the equilibrium condition inside the Debye layer, the ion concentration in the layer changes to cause an uneven zeta potential, causing a nonlinear electroosmotic slip near the interface of the micro-nano channel [3]. These complex unbalanced electrokinetic phenomena are important in the field of biomolecules or charged particle separation and enrichment [4,5,6]. The development of new micro-nanofluid systems capable of changing the electrolyte concentration in the EDL has once again caused researchers’ scientific interest in unbalanced EOF
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