| Summary: | 碩士 === 國立虎尾科技大學 === 機械與機電工程研究所 === 99 === This paper presents the passive micromixer on a CD microfluidic chip that performs plasma mixing function. The driving force of CD microfluidic device including, the centrifugal force due to the system rotation, the Coriolis force as a function of the rotation angular frequency and velocity of liquid. In this study, a commercial software tool (COMSOL) was used for mixing analysis. We present a numerical investigation on mixing and flow structures in microchannels with different geometries: square-wave, curved and zig-zag. Numerical results show that the mixing index of square-wave micromixer is the best design in all three cases of micromixers. Therefore, the square-wave micromixer will be selected for optimization design. The SU-8 mold was first fabricated on the silicon substrate and the soft replica molding method used to fabricate the PDMS micromixer. Following the fabrication process, the PDMS micromixers were bonded to the microfluidic CD using oxygen plasma treatment technique. A series of numerical and experimental investigations were performed to analysis the mixing index of micromixers. The experimental results show that the mixing index exceeded in 90 % when the disk rotates at a speed of around 2000 rpm in 5 seconds.
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