Numerical Simulation And Experimental Research Of The Induced Charge Electroosmotic

The analysis technique based on the microchip is one of the world’s mostcutting-edge technology fields. Nowadays, the Microfluidic Chip has become thecore content of Miniaturized Total Analysis System (μTAS). With the deepening ofmicrofluidic research, the design of the microfludic chip has become the focus in thisarea, what’s more, the design of micro-pump and micro-mixer are both the keys tothe microfluidic chip design. The induced charge electroosmotic (ICEOF) has all theadvantages of the electroosmotic which is the so called most successful driver pattern,and avoids the disadvantages of the electroosmotic. So it’s useful to do numericalsimulation and experimental research on the formation mechanism of the ICEOF, andapply it to the design of micro-pump and micro-mixer. The work based on ICEOF wehave done in this paper is listed as below:(1) The analysis of the formation mechanism of the ICEOF was carried out andthe equations which describe the coupled physics fields were established, and theequation of the Zeta potential of the induced electric double layer was given.(2) Based on the UDF interface of Fluent, a C program which describes theelectric field, flow field and consistence field was written and used for the numericalsimulation of the ICEOF around the conducting cylinder and Janus cylinder in thestraight micro channel.(3) Based on the theory of ICEOF, the improved design of the T-shapedmicro-pump was carried out. The innovation of this design is to embed the Januscylinder in the junction of the T-shaped pipe to improve the effect of driving. Thenumerical simulation results show that the driven effect of this pump is good, and thedriven effect will increase with the increase of the electric field intensity.(4) Based on the theory of ICEOF, the improved design of the U-shapedmicro-mixer was carried out. The innovation of this design is to embed a Januscylinder and ideally conducting cylinder in the micro-pipe respectively to improvethe driven effect and mixing efficiency. The numerical simulation results show thatthe driven effect and mixing efficiency of this micro-mixer are both good, and with the increase of the electric field intensity, the driven effect increase significantly, andthe mixing efficiency will remain above86%.(5) Based on the theory of Micro-PIV, the ICEOF visual test-bed wasestablished successfully, and the preliminary experimental research was carried out.The microfluidic chip with one metal cylinder in the straight micro channel wasdesigned, and the flow field around the metal cylinder under DC electric field isstudied by experiment. The experimental research shows that the experimentalresults are basically same as the numerical simulation results. The experiences wegot from the experiments also lay the foundations for follow-up experimentalresearch.