On the Design and Fabrication of Novel Passive Micro-mixers
Date Issued
2008
Date
2008
Author(s)
Zhuang, Jun-Wei
Abstract
Abstractt is an important topic for fast mixing two or more kinds of different μfluids in the micro systems and devices. It is also a significant factor that affected the functions of the systems.his thesis proposes a novel design of passive mixers. First, we analysis the flow fields, mixing indexes, and pressure coefficients by the commercial computational fluid dynamics software, FLUENT. In addition, we design a μmixer which meets the demands of low pressure drop, and high mixing performance by changing the μchannel structure size, and the orientation of the obstacle.ccording to the results of the simulations, the fabrication of the planar μmixers was based on the silicon wafer. After etching by the inductive coupling plasma etcher (ICP), we successfully fabricated our molds. Then we poured the PDMS on the molds to make our mixers and lifted the mixers from the molds. Finally, by using the oxygen plasma, we bonded the mixers with glasses to complete the chips. We use the pure methanol with fluorescent dye and D.I. water with food coloring as the working fluids. By using the charge-coupled device to capture the images, and employing the image analyzing software to quantity the concentration distribution, we can compare all the designs to find the simple structured, lowest pressure drop, and highest mixing performance mixer. Among our designs, 3-U turns & 2 streamlined obstacles per turn with 5 degree rotated design can meet the demand. At Re = 30, it has 0.79 of the mixing index, same as the serpentine design. However, it just needs three-quarter of the pressure coefficient. And we hope our design will essentially help the development of the μ-DMFC.
Subjects
μfluids
μmixer
CFD
Type
thesis
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