Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/2881
標題: 旋轉碟片上生成微氣泡之流道設計及可視化實驗
Design of flow-focusing microfluidics on a rotating disk to generate microbubbles and visualization experiment
作者: 高睿廷
Kau, Jui-Ting
關鍵字: 旋轉;rotationg;流體聚焦;微氣泡;flow-focusing;microbubble
出版社: 機械工程學系所
引用: Fu, T., Ma, Y., Funfschilling, D., and Li, H. Z., “Bubble formation and breakup mechanism in a microfluidic flow-focusing device,” Chemical Engineering Science, Vol. 64, 2009, 2392-2400. Xiong, R., Bai, M., and Chung, J. N., “Formation of bubbles in a simple co-flowing micro-channel,” Journal of Micromechanics and Microengineering, Vol. 17, 2007, 1002-1011. Tan, J., Li, S. W., Wang, K., and Luo, G. S., “Gas–liquid flow in T-junction microfluidic devices with a new perpendicular rupturing flow route,” Chemical Engineering Journal, Vol. 146, 2008, 428-433. Garstecki, P., Gañán-calvo, A. M., and Whitesides, G. M., “Formation of bubbles and droplets in microfluidic systems,” Technical Sciences, Vol. 53, No. 4, 2005, 361-372. Cubaud, T., Ulmanella, U., and Ho, C. M., “Two-phase flow in microchannels with surface modifications,” Fluid Dynamics Research, Vol. 38, 2006, 772-786. Arakawa, T., Yamamoto, T., and Shoji, S., “Micro-bubble formation with organic membrane in a multiphase microfluidic system,” Sensors and Actuators A, Vol. 143, 2008, 58-63. Chakraborty, D., and Chakraborty, S., “Controlled microbubble generation on a compact disk,” Appl. Phys. Lett, Vol. 97, 2010, 234103 1-3. Kim, DS., and Kwon, TH., “Modeling,analtsis and design of centrifugal force-drinen transient filling flow into a circular microchannel,” Microfluidics and Nanofluidics, Vol. 2, NO. 2, 2006, 125-140. Haeberle, S., Zengerle, R., and Ducrée, J., “Centrifugal generation and manipulation of droplet emulsions,” Microfluidics and Nanofluidics, Vol. 3, 2006, 65-75. Ducrée, J., Haeberle, S., Brenner, T., Glatzel, T., and Zengerle, R., “Patterning of flow and mixing in rotating radial microchannels,” Microfluidics and Nanofluidics, Vol. 2, No. 2, 2006, 97-105. 郭名哲, 利用靜態與旋轉十字型微流道生成乳化液滴可視化實驗, 國立中興大學碩士論文, 2009. 黃夙黛, 旋轉微流道生成微氣泡之可視化實驗, 國立中興大學碩士論文, 2010. 陳煜壬,利用流體聚焦生成微液滴與混合之實驗研究, 國立中興大學碩士論文, 2010.
摘要: 
本實驗研究利用旋轉流體聚焦形式之微流道,以矽油截斷吸入的空氣形成氣泡。實驗透過不同的旋轉中心到流道匯流處的距離Rj和流道寬度W來改變旋轉時流道中的壓力,控制氣泡的生成與尺寸大小。本研究藉由流場理論計算出不同轉速時流道內壓力的變化,並與可視化實驗的結果比對。Rj較小時,流道匯流區壓力變化較大,隨轉速增加生成較長的氣泡;相反地,Rj較大時,流道匯流區壓力變化較小,隨轉速增加生成氣泡的長度僅微幅增加。實驗亦發現,氣泡生成的轉速範圍受流道寬度的影響。寬度較窄的流道,可形成氣泡的轉速範圍較大;寬度較寬的流道,可形成氣泡的轉速範圍較小。

The present experimental study demonstrates generation of air bubbles of uniform size amid the oil in a microchannel by rotating the flow-focusing microfluidics fabricated on disk. The visualization experiments show that formation of bubbles, which depends largely on the suction pressure created at the flow-focusing junction, may be controlled through the rotational speed in association with the channel width (W) and the distance from the center of rotation to the junction (Rj). For a smaller Rj of 22 mm, the larger variation of suction pressure at the junction with the rotational speed enables to produce bubbles with a wide range of length. For a larger Rj of 32 mm, contrarily, the length of bubble varies in a rather smaller range with the rotational speed. The experimental results also show that the range of rotational speed within which bubbles can be formed is larger for narrower channels.
URI: http://hdl.handle.net/11455/2881
其他識別: U0005-2708201217460000
Appears in Collections:機械工程學系所

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