添加微量液體對振動床中顆粒體分離現象的影響

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蔡宗翰(Tsung-Han Tsai) 查詢紙本館藏

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論文名稱

添加微量液體對振動床中顆粒體分離現象的影響
(The influence of adding liquids in binary mixture of granular materials on segregation mechanism)

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摘要(中)

本論文以實驗方法，針對顆粒體間添加微量液體後運動情形的影響，以各佔一半體積之大小顆粒加入振動床系統做為實驗設備，添加的液體包括5種黏滯度不同的矽油，借由影像處理技術對大顆粒體整體的平均高度對時間的變化作一系列的討論，其中包括穩態時間、穩態平均高度以及上升速度。
本文主要探討的控制參數為添加矽油的黏滯度和添加矽油的無因次液體含量，其中矽油的黏滯度影響液橋力的大小，而矽油的無因次液體含量與液橋的形成與否和數量的多寡有關。在本實驗中振動床內的大小顆粒體就有尺寸和密度不同所造成的分離現象，而液橋力則會阻礙顆粒體的運動，在這些力的作用下產生不同的分離結果。
本實驗中大顆粒體穩態平均高度及平均上升速度，會呈現黏滯度越高則越低，無因次液體含量越高也是一樣結果，至於達到穩態時間和分離率則相反，隨著黏滯度和無因次液體含量增加而減小。

摘要(英)

The influence of adding liquids in binary mixture of granular materials on segregation mechanism was studied in this paper. The experiment facility of a vertical vibrated bed was used in this study. The granular materials consist of a binary mixture with the same volume fraction of small/heavy and large/light particles. The liquids added in the granular materials are silicon oils with five different viscosities. The ensemble average height of large particles changes with time.
This controlled parameters include viscosity and dimensionless liquid content of the adding silicon oils. The liquid bridge force was greater with the increasing viscosity of the silicon oil. The increasing dimensionless liquid content of the liquid results in and stronger liquid bridges causing the higher liquid bridge force in the system. In this study, the particles in the vibrated bed display the segregation phenomenon due to the different size and density of particles. The particle motions are weaker in the system with adding more viscous or higher amount of liquid due to the stronger liquid bridge force. It results in the reduction of the segregation.
The results show that the dimensionless average height of large particles and average rising velocity decrease with the increase of the viscosity and dimensionless liquid content of adding silicone oil. However segregation and the time for reaching steady state in the system decreases with the increase of the viscosity and dimensionless liquid content of adding silicone oil.

關鍵字(中)

★ 分離
★ 振動床
★ 顆粒床
★ 液橋力
★ 黏滯度
★ 液體含量

關鍵字(英)

★ granular bed
★ liquid bridge force
★ viscosity
★ liquid content
★ vibrated bed
★ segregation

論文目次

摘要 I
目錄 IV
附表目錄 VI
附圖目錄 VII
符號說明 X
第一章簡介 1
1.1 顆粒流介紹 1
1.1.1 顆粒體簡介 1
1.1.2 顆粒流與一般流體的差異性 2
1.1.3 顆粒流的研究發展 5
1.1.4 顆粒體在振動床內的介紹 7
1.2 偏析現象 10
1.2.1偏析現象的探討 10
1.2.2振動床內的偏析現象 12
1.3 液體對顆粒體運動的影響 13
1.3.1 顆粒體間的液橋現象 15
1.3.2 液橋力 16
1.3.3 表面張力 16
1.3.4 黏滯力 18
1.4 研究動機與方向 19
第二章實驗方法 21
2.1 實驗設備 21
2.2 實驗原理與方法 26
2.2.1 實驗參數 26
2.2.2 實驗計算原理 31
2.3 實驗步驟 33
2.4 誤差分析 35
第三章結果與討論 37
3.1液體含量對顆粒體分離性質的影響 37
3.2液體黏滯度對顆粒體分離性質的影響 47
3.3分離係數的探討 49
第四章結論 51
參考文獻 52

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指導教授

蕭述三(Shu-San Hsiau)

審核日期

2008-7-22

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