卡艾瑋臺灣大學：土木工程學研究所文向權Wen, Hsiang-ChuanHsiang-ChuanWen2007-11-252018-07-092007-11-252018-07-092004http://ntur.lib.ntu.edu.tw//handle/246246/50135本研究著重於與液體分離之氣泡運動和吸引周圍液體之流場分析。氣泡穩定地沿著傾斜之緩波運動。實驗與數值方法均會在文中提及。小規模的實驗也會利用兩種黏度不同之液體加以進行。數位影像則是利用雷射激發光芒的顆粒當成追蹤物去進行可視化與量測之工作。文中將會介紹經由組合一連串從攝影機擷取出的影像成為一個複合的流場圖去模擬長時間曝光的照片。數值模擬方法包含了一連串不連續之點源與渦旋並且靠著從實驗中獲的之氣泡形狀與分離點進行模擬。The present investigation focuses on the motion of an isolated air bubble and the induced ambient flow. The bubble moves steadily along an incline of mild slope. Both experiments and computations are performed. Small-scale experiments are conducted with liquids of two different viscosities. Digital imaging of laser-illuminated tracers is used to visualize and measure the flow. A composite picture of the flow field is obtained by assembling a sequence of video images in a manner which simulates a long exposure photograph. Computations involve discrete sources and vortices, and rely on the bubble shape and detachment point extracted from the experimental observations.誌謝 摘要 Ⅰ Abstract Ⅱ Contents Ⅲ Table List Ⅳ Figure List Ⅴ 1. Introduction 1.1 2. Laboratory experiments 2.1 2.1 Experiment set-up 2.2 2.2 Fluid properties 2.6 2.2.1 Density 2.6 2.2.2 Viscosity 2.7 2.2.3 Surface tension 2.8 2.2.4 Synthesis of results 2.10 2.3 Bubble shapes and sizes 2.12 2.4 Bubble speed 2.14 2.5 Approach to steady state 2.19 3. Imaging analysis of the outer flow field 3.1 3.1 Simulated long exposure 3.2 3.2 Particle tracking velocimetry (PTV) 3.7 3.3 Flow field interpretation 3.10 4. Meshless simulations of the outer flow field 4.1 4.1 Irrotational flow calculated using discrete sources 4.2 4.2 Rotational flow calculated using discrete vortices 4.9 5. Conclusions 5.1 5.1 Conclusions 5.1 5.2 Avenues for future work 5.3 References a5366551 bytesapplication/pdfen-US流場分析氣泡無網格數值模擬PTV雷射發光顆粒Method of fundamental solutions.Laser- illuminated tracersAir bubblesthesishttp://ntur.lib.ntu.edu.tw/bitstream/246246/50135/1/ntu-93-R91521317-1.pdf