微氣泡產生器之研究及其應用

A Study of Microbubble Generator and Its Applications

王怡華(Yi-Hua Wang)

指導教授 ： 王安邦

國立臺灣大學/工學院/應用力學研究所/碩士(2005年)

https://doi.org/10.6342/NTU.2005.02895

摘要

本文研究單一微氣泡在微流道中生成之方法，其中微氣泡產生器為一後端具收縮段結構之十字狀流道。在本論文實驗中，以兩種不同之收縮角為例分析微氣泡之生成。微流道是以聚甲基二矽烷(polydimethysiloxane, PDMS)作為材料利用軟微影 (soft lithography)技術完成。微氣泡產生的方法是利用收縮段停止氣液界面之前進並由兩側分支流道引入液體將之切斷而成一特定尺寸之微氣泡。在氣泡停止位置之分析中，証實了收縮段的的確具有阻擋氣體注入之作用。另外，透過重複產生單一氣泡的步驟以形成氣液間隔形態的微氣泡流，初步發展出微氣泡流之原型。即，本研究中提出了一種產生微氣泡流之新穎的方式。

關鍵字

微氣泡 ； 微氣泡流 ； 氣體注射

並列摘要

Generation of single microbubble by injection in microchannel has been investigated in this thesis. Microbubble generator is a cross type microchannel configured with contraction section. To analyze microbubble generation, two different contraction angles, 10° and 15° have been experimentally studied. Microchannels are fabricated in PDMS (polydimethysiloxane) by using soft lithography technique. Method of microbubble generation is to stop gas-liquid interface by contraction and segment gas stream into designed length by liquid from side channels. Stop position analysis shows that contraction channel stops the gas injection indeed. Further, by repeating the sequences of single microbubble generation in order to form microbubbly flow, and a model of microbubbly flow is developed preliminarily. Namely, a novel method for microbubbly flow formation is proposed in this thesis.

並列關鍵字

microbubble ； microbubbly flow ； gas injection

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