Numerical Simulation And Experimental Research Of The Induced Charge Electroosmotic In Microfluidic Chip

The analysis technique based on the microfluidic chip is one of the world's most cutting-edge technology fields.Electro-kinetic micro-fluidics technology plays a very important role in microfluidic chip technology and it can be used to transport and mix fluid,and even sort micro-particles in micro-channels.Induced-charge electro-osmosis flow(ICEOF)is a kind of electro-kinetic micro-fluid.The driving and control of micro-fluid in the ICEOF is mainly achieved by the double electric layer(DEL),and the DEL of polarizable particles is induced by the applied electric field.It is found that the relation between the velocity of the polarizable particle's surface and the strength of the applied electric field is quadratic nonlinear.Therefore,the ICEOF is better than electro-osmosis flow(EOF)at the ability of driving micro-fluids.In general,ICEOF has a broad application prospects.The work based on ICEOF we have done in this paper is listed as below:(1)The analysis of the formation mechanism of the ICEOF was carried out and the equations which describe the coupled physics fields were established,and the equation of the Zeta potential of the induced electric double layer was given.(2)Based on the UDF interface of Fluent,the electric field,the multi-physics control equation and related boundary conditions in the electroosmotic flow are optimized,and the flow field of induced electroosmotic flow is successfully simulated.(3)The experimental platform of ICEOF was constructed and preliminary experimental study was carried out.Besides,a simple micro-fluidic chip was designed and a typical ICEOF phenomenon was successfully experimented.The result shows a feasibility of ICEOF which laid a foundation for the follw-uo study of ICEOF.(4)In this paper,a cross-chaped micro-pump based on the principle of ICEOF is designed and the relationship between current and voltage is studied through Fluent numerical simulation.The quadratic equation of the relationship between the velocity at the outlet and electric field of the cross micro-pump is obtained according to the results.The advantages of ICEOF micro-pumps are simple structure,ease of integration,easy to operate and low production cost which has tremendous potential in the domain of micro chemical analysis and biological chip and so on.This article build a foundation for the future experiment of ICEOF by exploring formation mechanism of ICEOF,numerical simulation and visualization experiment.