微量細粉對顆粒潰壩崩塌流動之影響

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宋育翔(Yu-Hsiang Sung) 查詢紙本館藏

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能源工程研究所

論文名稱

微量細粉對顆粒潰壩崩塌流動之影響
(Effect of a small amount fine powder on granular column collapses)

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摘要(中)

本研究採用一1.5公尺長，0.1公尺寬，1.0公尺高的矩形玻璃儲槽模型以及氣壓缸的方式迅速抽離擋板讓預先填好的顆粒體模擬出顆粒潰壩(dam-break)實驗，並在於相同初始寬高比(initial aspect ratio)下，使用顆粒粒徑比的不同及改變細粉含量大小下探討顆粒崩塌流流動性及運動狀態之影響。且為了捕捉到顆粒崩塌瞬間每一個時間點運動變化，透過高速攝影機以及搭配PIV技術(Particle image velocimetry)來觀察顆粒崩塌流速度上的變化以及特定時間點下其速度剖面的差異。
由實驗結果得知隨著細粉含量的增加，使得細粉存在於粗顆粒中因崩塌過程重力驅動使得崩塌狀態下細粉的旋轉減少了粗顆粒及壁面之間摩擦而造成的潤滑效果(lubrication effect)，造成其整體崩塌持續時間增長，流動性因此而變得較佳。且顆粒崩塌流動過程，因細粉滲透與粗顆粒分離而造成粗顆粒浮出在崩塌自由表面上，而造成粗顆粒在細粉所形成的潤滑層上流動來增加其流動性。且藉由分析特定位置(δL/3+Li)下顆粒流動的速度剖面來探討顆粒崩塌深度上速度至自由表面上的速度變化，以及隨著細粉含量的增加所造成顆粒崩塌流其流動性的增加。

摘要(英)

In this study, we used a pneumatic cylinder to quickly lift the baffle through air intake and exhaust, so that the pre-filled particles collapsed instantaneously to conduct a series of particle collapse experiments. And under the same initial aspect ratio, use different particle size ratios and change the content of fine particles to observe the difference in particle flow behavior. In order to capture the changes in particle motion when the particles collapse, high-speed cameras and PIV technology (particle image velocimetry) are used to observe the changes in the flow velocity of the particle collapse and the velocity distribution at a specific characteristic time point of the particle collapse.
According to the experimental results, as the content of fine particles increases, the rotation of the fine particles in the collapsed state of the fine particles between the coarse particles will reduce the lubrication effect caused by the friction between the coarse particles and the wall surface, and cause its overall duration to increase collapse mobility. Due to the infiltration of fine particles and the separation of coarse particles, the process of particle collapse and flow produces a pure particle layer on the collapsed free surface. By analyzing the velocity distribution of the particle flow at a specific location (δL/3+Li), the velocity in the depth direction can be analyzed. The effect of surface velocity changes and particle collapse flow caused by the increase of fine particles.

關鍵字(中)

★ 粒子流
★ 潰壩崩塌
★ 流動性
★ 潤滑

關鍵字(英)

★ Granular column collapse
★ Dam-break
★ Flowability
★ Lubrication

論文目次

摘要 I
AbstractII
目錄 III
附圖目錄 V
附表目錄 X
符號目錄 XI
第一章簡介 1
1.1 前言 1
1.2 顆粒崩塌流 2
1.3 顆粒潤滑機制 4
1.4研究動機 6
1.5 研究方向與本文架構6
第二章實驗方法與原理15
2.1 實驗設備與材料15
2.1.1 實驗設置 15
2.1.2 實驗儀器設備15
2.1.3 顆粒材料 16
2.2 實驗與分析方法16
2.2.1 實驗方法 16
2.2.2 實驗流程 18
2.2.3 實驗影像與分析方法 19
2.2.4 流場速度計算與分析 20
第三章結果與討論 32
3.1 顆粒崩塌定量分析 32
3.1.1崩塌流動歷程變化 32
3.1.2 崩塌流動層面積比較 35
3.1.3 流動層垂直厚度比較 36
3.1.4 崩塌距離隨時間之變化37
3.1.5 顆粒崩塌流動性比較 39
3.1.6 顆粒崩塌持續時間 40
3.2 顆粒崩塌流場與速度分析41
3.2.1 速度場分析 41
3.2.2 速度分佈 42
3.2.3 速度剖面分析 43
3.2.4 流動層剪切速率比較 45
第四章結論 121
參考文獻 123

參考文獻

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指導教授

蕭述三

審核日期

2021-1-7

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