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標題: 光碟式旋轉微流體混合之可視化實驗
Visualization Experiments of Compact Disk Microfluidics for Fluid Mixing
作者: 林茂吉
Lin, Mao Chi
關鍵字: rotational microfluids mixing;旋轉微流體混合;Centrifugal Force Coriolis Force;Flow Visualization;離心力 科氏力;流場可視化
出版社: 機械工程學系

This study uses the flow visualization method to observe mixing phenomenon of two fluids in the microchannel fabricated on the Compact Disk(CD)-like PMMA substrate. Ferric chloride and ammonium thiocyanate respectively dissolved in the deionized water are used as the working fluids in the experiment. Quantification of mixing efficiency is based on the reaction of the two fluids. The forces acting on the flow field include the centrifugal and Coriolis forces. The centrifugal force pointing in radial direction drives the fluids to flow along the channels. The Coriolis force that may introduce the secondary flow pointing in the direction across the channels is expected to enhance the mixing. Photoresist is employed as the material for fabrication of the channel structure on the CD-like rotating chip. The chip is thermally bounded with PMMA for flow visualization and measurements of the mixing efficiency. The visualization mechanisms are composed of the image acquisition system, a DC motor with encoder, and the in-house synchronizer for capturing the synchronizing images. The passive valves for restraining the capillary force could be realized by designing a channel width of 200μm and a depth of 110μm or 150μm together with a suitable wedge angle. The experimental results on the“capillary-burst valves”are consistent with the theory that has been modified for the present microchannels to take the three-dimensional surface tension effects into account. In the mixing experiments, the pseudo-Coriolis phenomenon is observed inside the channel with fins and the mixing efficiency in the channel with 1-fin is better than that in the channel with 2-fins or 3-fins. The presence of bubbles in the microchannels in the course of the mixing experiments hinders the observation of the Coriolis effects in the present study. Improvements may be achieved by re-design of the channel geometry and the visualization setup .
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