王安邦臺灣大學：應用力學研究所王怡華Wang, Yi-HuaYi-HuaWang2007-11-292018-06-282007-11-292018-06-282005http://ntur.lib.ntu.edu.tw//handle/246246/62344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。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.ACKNOWLEDGEMENT i ABSTRACT ii 摘要 iii TABLE OF CONTENTS iv LIST OF FIGURES vi CHAPTER 1 INTRODUCTION 1 1-1 MOTIVATION AND GOAL 1 1-2 LITERATURE REVIEW 3 1-3 ORAGANIZATION OF THIS THESIS 5 CHAPTER 2 MICROBUBBLE GENERATOR 6 2-1 FABRICATION OF MICROBUBBLE GENERATOR 6 2-1-1 DESIGN OF MICROBUBBLE GENERATOR 6 2-1-2 FABRICATION OF MICROBUBBLE GENERATOR 10 2-1-2-1 MASTER OF PDMS FLOW CHANNEL 10 2-1-2-2 FABRICATION OF PDMS FLOW CHANNEL 12 2-1-2-3 BONDING PROCESS 13 2-2 EXPERIMENT AT DESCRIPTIONS 17 2-2-1 EXPERIEMENT MICROBUBBLE GENERATOR 17 2-2-1-1 EXPERIMENT SETUP 17 2-2-2 EXPERIMENT METHOD 19 2-3 EXPERIMENT RESULTS 23 2-3-1　CASE 1: qc=10° 23 2-3-2　CASE 2: qc = 15° 27 2-3-2-1 POSITIONAL ANALYSIS 27 2-3-1-2 STOP POSITION ANALYSIS 28 2-3-1-3 SURFACE PROPERTY ISSUE 28 CHAPTER 3 MICROBUBBLEY FLOW 34 CHAPTER 4 CONCLUSIONS AND FUTURE WORK 38 4-1 MICROBUBBLE GENERATOR 38 4-2 MICROBUBBLY FLOW 39 4-3 RECOMMENDATIONS FOR FUTURE WORKS 39 REFERENCES 411406096 bytesapplication/pdfen-US微氣泡微氣泡流氣體注射microbubblemicrobubbly flowgas injectionthesishttp://ntur.lib.ntu.edu.tw/bitstream/246246/62344/1/ntu-94-R91543025-1.pdf