Drainage Efficiency and Bubble Transport and Surfactant Effect in a multi-U-shape Micro channel
Date Issued
2014
Date
2014
Author(s)
Lin, Ting-Yu
Abstract
In order to solve the problem that water remains in multi-serpentine channel, the present study performs a multi-serpentine channel with drainage branches, and various fluids were applied to investigate effects that different fluid properties bring. With applications of T-junction and flow focusing geometry, bubbles were produced to analyze the stability, wettability and size of bubbles. We used Ca-We diagram to categorize bubble generation regimes. The diagram shows that the transition of boundary between wetting and non-wetting bubbles occurs at about Ca=0.006. In the results of the research, the drainage rate was increased as the Ca increased.
Finally, the experimental results show the channel could drain more than 90% of fluid. Furthermore, the gas could be maintained in the flow channel, thus the problems of hydrogen fuel cells could be solved. Adding surfactant in the fluids could reduce the surface tension, and would enhance the wettability. Thus wetting could be achieved in low flow rates condition, and the efficiency of fuel cell would be improved.
Subjects
微流體
界面活性劑
兩相流
微流道
氣泡
Type
thesis
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