Design and Numerical Study of Micropump Based on Induced Electroosmotic Flow

Abstract

Induced charge electroosmotic flow is a new electric driving mode. Based on the Navier-Stokes equations and the PoissonNernst-Planck (PNP) ion transport equations, the finite volume method is adopted to calculate the equations and boundary conditions of the induced charge electroosmotic flow. In this paper, the formula of the induced zeta potential of the polarized solid surface is proposed, and a UDF program suitable for the simulation of the induced charge electroosmotic is prepared according to this theory. At the same time, on the basis of this theory, a cross micropump driven by induced charge electroosmotic flow is designed, and the voltage, electric potential, charge density, and streamline of the induced electroosmotic micropump are obtained. Studies have shown that when the cross-shaped micropump is energized, in the center of the induction electrode near the formation of a dense electric double layer, there exist four symmetrical vortices at the four corners, and they push the solution towards both outlets; it can be found that the average velocity of the solution in the cross-flow microfluidic pump is nonlinear with the applied electric field, which maybe helpful for the practical application of induced electroosmotic flow in the field of micropump.

A systematic overview of electrode configuration in electric‐driven micropumps

“…Consequently, the mass flow rate increased from 1.37 × 10 −5 to 1.41 × 10 −5 kg∕s and from 0 to 1.97 × 10 −5 kg/s at inlet and outlet, respectively. Using a finite volume method, Zhang et al [131] modeled an induced charge electroosmotic micropump and proposed the induced zeta potential formula for the polarized solid surface. In their design, a cylindrical polarizable solid (100-µm diameter) was placed in the middle of the crossshaped microchannel with a width of 200 µm (Figure 31).…”

“…[130] copyright 2016, Elsevier F I G U R E 3 1 Illustration of micropump geometry used in Ref. [131] and enrich microscale particle samples in both static and dynamic conditions.…”

Dynamic Modeling and Flow Distribution of Complex Micron Scale Pipe Network

“…The main functions of the microfluidic system are transferring and mixing, reaction separation, and flow control of microfluidics in the microchannels. Because of the small size of the fluid channel, the fluid flowing in the microchannel is mostly in the laminar flow state, such as particles, droplets or bubbles, which generally belong to the field of low Reynolds number fluid theory in microchannels [ 2 ].…”

Transient characteristics of electric double layer charging and the associated induced-charge electrokinetic flow

“…To avoid the use of the "stand" assumptions, the full numerical model consisting of coupled Poisson-Nernst-Planck and Navier-Stokes equations has been recently formulated to investigate ICEK phenomena. 20,21,29,39,40…”