Development of a Novel Herringbone-type Micromixer
| Autor: | Kuo-Hsiu Huang, 黃國修 |
|---|---|
| Rok vydání: | 2005 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 94 It is well-known that in microscale fluidic mixing is extremely difficult, and requires long mixing time as well as long mixing length. In this research, we present a novel herringbone patterns for micro-mixers. The concept of the design is to periodically change the lengths of the herringbone structures built on the bottom surface of a micro channel. These herringbone structures effectively generate chaotic advection and diffusion effects to stir the flow and induce fluidic mixing. The micromixers are fabricated using MEMS process. The molds of the herringbone and channel patterns are fabricated on silicone wafers using an ICP-RIE etcher. The replicas are made by curing PDMS on the molds. The mixing behaviors of the fabricated micromixers have been observed by using both an optical microscope and a fluorescence microscope. It is demonstrated that with the periodically changed lengths of the herringbone patterns, through continuously stretching and squeezing the fluids, chaotic advection is generated. It also disturbs the flow field to speed up the diffusion effect between the flows. At the condition of extremely low Reynolds number (Re=0.189), a channel length of about 10mm is required for complete mixing. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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