| Summary: | 碩士 === 臺灣大學 === 應用力學研究所 === 98 === Micromixer is one of the commonly microfabricated components in the microfluidic devices, and it is frequently adopted for mixing diverse biological samples. In recent years, types of micromixers which are actuated with different extrenal energy inputs are constantly developed, such as the acoustic, electrokinetic, and magneto-hydrodynamic type, etc.. Below the multitudinous investigation with regard to micromixers, the application on the electrokinetic micromixer is one of popular topics. For micromixers actuated with electrokinetic mechanisms, electrothermal(ET) and electroosmotic(EO) micromixers are widely discussed. EO micromixers mainly include three categories: DCEO, ACEO and TWEO micromixers. So far, most of them are concentrated on the experimental and simulated application on DCEO and ACEO micromixers, whereas the relevant application on TWEO micromixers is extremely less.
Consequently, in this paper, we will analyze and discuss the performance of TWEO micromixers with FEM software, COMSOL Multiphyiscs. In the limited length of microchannels, it is discovered from the simulation consequences that specific vortex pairs are generated by phase alternations of AC signals and geometrical modifications of electrodes, so that the flowing field can be stirred, two separated samples inside it mixed and mixing efficiency promoted. Finally, we propose two mixing modes in terms of assembling AC signal phases and electrode geometries, and 97.89% mixing efficiency can be achieved in the length of 400μm microchannels.
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