不同粒子堆積高度振動床迴流運動機制之研究

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沈柏諺(Po -Yen) 查詢紙本館藏

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機械工程學系

論文名稱

不同粒子堆積高度振動床迴流運動機制之研究
(The transport properties of convection roll in a vibrated granular bed)

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摘要(中)

本論文以實驗的方式，研究顆粒體受到垂直振動時的迴流運動現象，以振動床作為實驗設備，探討在相同振動加速度與振動頻率下，改變顆粒體堆積高度，對顆粒體迴流運動現象的影響。
在實驗方面，應用影像處理技術及粒子追蹤的方法，可準確量測並計算出追蹤粒子的位置與速度大小，藉由追蹤粒子的垂直速度與容器寬度的關係可以算出顆粒體迴流中心質量流率J的大小，由實驗結果顯示，顆粒體的堆積高度改變與顆粒體迴流之質量流率J有顯著的雙峰化關係。

摘要(英)

he transport properties of convection roll in a two-dimensional vibrated granular bed in the same vibration acceleration and vibration frequency are investigated by increasing the heap height of the granule in this paper.
The image processing technology and particle tracking method were employed to measure the fluctuating velocity and the dimensionless mass flow rate.

關鍵字(中)

★ 質量流率
★ 迴流
★ 振動床

關鍵字(英)

★ vibrated bed
★ convection
★ mass flow rate

論文目次

目錄
摘要 I
附表目錄 IV
附圖目錄 V
符號說明 VIII
第一章簡介 1
1.1顆粒體介紹 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粒子流的研究發展 5
1.1.4顆粒體應用於垂直振動床的介紹 8
1.2振動床內的迴流現象 11
1.3振動床內的偏析現象 13
1.4研究動機與方向 16
第二章實驗方法 18
2.1實驗設備 18
2.2實驗參數 23
2.3 Correlation 簡介 23
2.3.1 Correlation 程式流程 25
2.4粒子溫度及無因次質量流率之概念 27
2.5實驗步驟 29
2.6誤差分析 31
第三章結果與討論 33
3.1不同粒子堆積高度對質量流率的影響 33
3.2不同床高對迴流胞大小的影響 35
3.3 迴流胞粒子溫度對迴流現象的影響 41
3.4 床台輸入能量對於迴流現象的影響 43
第四章結論 45
參考文獻 47

參考文獻

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指導教授

蕭述三(Shu-san Hsiau)

審核日期

2009-7-24

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