添加微量液體對不同密度顆粒於旋轉鼓內分離機制的影響

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溫士鋒(Shi-Feng Wen) 查詢紙本館藏

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機械工程學系在職專班

論文名稱

添加微量液體對不同密度顆粒於旋轉鼓內分離機制的影響

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摘要(中)

本論文是以類二維的精密旋轉鼓為實驗設備，並以實驗的方式探討添加微量液體含量及旋轉鼓轉速快慢，對不同密度顆粒在旋轉鼓中分離機制的影響。運用高解析及高速攝影機搭配影像分析及粒子追蹤的方法，分析及量測分離強度、安息角(Angle of Repose)、速度場變化等影響分離機制的重要指標。實驗結果顯示添加微量液體含量的多寡與轉速的快慢，會使混合的現象呈現較佳，也代表此兩項參數對於密度分離機制有顯著的影響；隨著無因次液體含量增加，顆粒體間的液橋隨之增厚，平均架橋數也跟著增多，顆粒間彼此吸附力量增加，因此會形成較大的安息角，並抑制分離效應；而當轉速增加時，重顆粒平均流動速度變快，轉速的提升代表外界供給系統的能量變大，因此重顆粒能有較大的動能與較快的速度，也使得間隙液體對速度的影響慢慢變小。實驗結果亦發現最終分離強度會隨著安息角變大而產生線性遞減的關係且無關於轉速及微量液體含量；本研究也試著將過去尺寸效應的數據結果與本研究密度效應的結果相互比較，結果顯示安息角與最終分離強度仍是維持線性遞減的關係。

摘要(英)

The density-induced granular segregation phenomenon of wet granular materials was experimentally studied in a quasi-2D rotating drum. The motions of the granular materials were recorded by a high-speed camera. Image processing technology and particle tracking method were employed to measure the segregation intensity, repose angle and the velocities of heavy particles. The effects of liquid content and rotation speed on segregation index, angle of repose, and velocity field in the rotating drum were investigated and discussed in this paper. The experimental results indicate that the liquid content and rotation speed have significant influences on density-induced granular segregation. The segregation intensity is mitigated with the increase of liquid content because of the stronger cohesive force between particles. It also shows that segregation intensity is reduced with the increasing of rotation speed. The segregation index is demonstrated to be decreased with the increase of the repose angle of wet granular materials, regardless of the addition of liquid content, liquid viscosity, rotation speed, density effect and size effect.

關鍵字(中)

★ 旋轉鼓
★ 液體含量
★ 分離強度
★ 安息角
★ 流場速度

關鍵字(英)

★ liquid content
★ segregation
★ angle of repose

論文目次

摘要 i
Abstract ii
目錄 iii
附表目錄 vi
附圖目錄 vii
符號說明 ix

第一章緒論 1
1-1前言 1
1-2研究目的 2
1-3論文架構 3
第二章基礎理論 4
2-1粒子流的特性 4
2-2二維旋轉鼓簡介 4
2-2-1旋轉鼓的應用 4
2-2-2 旋轉鼓內運動型態 5
2-2旋轉鼓中的分離機制 6
2-3影響分離的因素 7
2-3-1 粒子的粒徑差異 7
2-3-2粒子的密度差異 9
2-3-3乾溼粒子的差異 12
2-3-4顆粒體間的液橋現象 14
第三章實驗方法 17
3-1實驗設備 17
3-2實驗原理與方法 20
3-2-1實驗參數及原理 20
3-2-2影像處理簡介 21
3-2-3分離指標 23
3-2-4安息角的量測 24
3-2-4速度場的量測 24
3-3實驗流程 25
3-3-1實驗配置 25
3-3-2實驗步驟 25
3-4誤差分析 28
第四章結果分析與討論 30
4-1 間隙液體含量對不同密度顆粒流動性質之探討 30
4-1-1 間隙液體含量對分離強度之影響 30
4-1-2 間隙液體對安息角之影響 32
4-1-3 安息角與最終分離強度之關係 32
4-1-4 間隙液體對流動速度之影響 33
4-1-5 粒子結合數對最終分離強度之關係 34
第五章結論 36
參考文獻 38
附表 41
附圖 43

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指導教授

蕭述三(Shu-San Hsiau)

審核日期

2015-1-22

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