不同密度顆粒於振動床中之分離現象分析

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陳文正(Wen-Zhen Cheng ) 查詢紙本館藏

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不同密度顆粒於振動床中之分離現象分析

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摘要(中)

在振動床中，對於大小不同之顆粒體會有大顆粒向上升，而小顆粒向下沈的分離效應有較多的研究，密度不同之顆粒混合振動則較少討論，本文即是探討在二維狀態下顆粒體在振動床的分離效應。顆粒體在垂直振動中，具有複雜且多樣的運動，而混合顆粒間在振動床上的分離現象在實驗中極易受到各種因素變化的影響。因此，本文是討論在二維的狀態下，不同密度大小組合的混合顆粒體與分離所需時間之間的關係及在不同加速度下，對分離時間的影響與分離強度的關係。實驗結果顯示了，當密度比越大時，其所需的分離時間越短。反之當密度比越小時，其所需的分離時間越長，甚至分離現象不明顯。而在迴流強度之影響方面，加速度越大，迴流強度越強，整體粒子溫度越大，分離效果越佳，所需的分離時間越短。

關鍵字(中)

★ 分離係數
★ 分離最終值
★ 振動床
★ 顆粒體

關鍵字(英)

論文目次

摘要………………………………………………………………… I
目錄………………………………………………………………… Ⅱ
附表目錄…………………………………………………………… Ⅳ
附圖目錄…………………………………………………………… V
符號說明…………………………………………………………… Ⅸ
第一章簡介
1.1 粒子流簡介………………………………………………… 1
1.2 垂直振動床的研究歷史…………………………………… 1
1.3 分離現象的發展研究……………………………………… 2
1.4 研究方向…………………………………………………… 5
第二章實驗設備與方法
2.1 實驗裝置…………………………………………………… 6
2.2 實驗操作步驟……………………………………………… 10
2.3 實驗計算原理……………………………………………… 12
2.3.1 速度向量、溫度的計算……………………………… 12
2.3.2 分離係數……………………………………………… 16
2.3.3 迴流速度……………………………………………… 17
2.3.4 分離最終值…………………………………………… 17
2.4 誤差分析…………………………………………………… 17
第三章結果與討論
3.1 不同時間分離流場狀態…………………………………… 19
3.2 分離係數…………………………………………………… 21
3.3 密度比與參數的關係……………………………………… 25
第四章結論…………………………………………………… 27
參考文獻…………………………………………………………… 28

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指導教授

蕭述三(Shu-San Hsiau)

審核日期

2001-7-4

推文