| Summary: | 碩士 === 國立成功大學 === 機械工程學系碩博士班 === 100 === In this works, we investigate the mixing behavior of shear-thinning fluids in corrugated micromixers with grooves. For comparison purpose, the performance of the corrugated micromixers with staggered herringbone grooves and that of the straight micromixers with staggered herringbone are also studied. The shear-thinning fluids considered are the carboxymethyl cellulose (CMC) Solution. We use software, CFDRC, to simulate the fluid flow and diffusion in the micromixers. In fabrication, SU-8 thick film photoresist is used to fabricate the mold of the micromixers by photolithography. Then, replicating the mold by PDMS and bonding the mold and a cover glass complete the fabrication of a micromixer. The concentration distribution of Rhodamine 6G in the flow is observed by a laser confocal spectral microscopy. The images of mixing fluids obtained by experiment and simulation are in reasonable agreement. The results obtained show the following trends. (i) The mixing efficiency of the corrugated micromixers with staggered herringbone grooves is better than that of the corrugated micromixers without grooves and that of the straight micromixers with the staggered herringbone grooves. (ii) Since the average viscosity of the deionized (DI) water is less than that of the CMC solutions at the flow rate considered, the effect of the lateral convection and the degree of mixing of the DI water are lager than that of the CMC solution. (iii) The pressure drop in a micromixer is proportional to the average viscosity of the fluid in the micromixer.
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