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姓名 謝明凱(ming-kai Hsieh)  查詢紙本館藏   畢業系所 機械工程學系
論文名稱 溼度對振動顆粒床堆積現象影響之探討
(The Heaping Angle of Vertical Vibrated Granular Effect of Humidity)
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摘要(中) 溼度改變是影響顆粒體運動的主因之一,因此溼度對顆粒體的影響已經受到許多學者的重視。本論文以實驗的方式研究不同溼度下顆粒體於垂直振動時所形成堆角的變化。觀察以不同的振動加速度配合不同的相對溼度對顆粒堆積的影響,並對結果作深入的探討。
本實驗以導入蒸氣的方式控制溼度,首先固定相同的溼度,改變不同的振動加速度觀察堆角的變化。接著再改變溼度觀察溼度對堆角的影響。結果顯示,當振動加速度到達某個特定值時顆粒會有較大的堆積角。而溼度方面,實驗的結果也顯示當溼度變化時,顆粒的堆積角會有先增後減的變化。
摘要(英) Variable humidity is the main factor to affect the behaviors of granular materials. In this study, experimental method is used to investigate the variations of heaping angles with different humidity in the vertical vibrated granular bed. At the same time, vibrating acceleration is also changed to obtain the granular heaping. To control the humidity inside the closed bed system, water vapor is induced into the bed by a vacuum motor and many valves. The heaping angle of granular materials increase initially with increasing humidity, however, it decrease with increasing humidity after the relative humidity approaches 37%. On the other hand, heaping angle become larger when the vibrating acceleration has been over somewhat value.
關鍵字(中) ★ 溼度
★ 振動床
★ 堆積
關鍵字(英) ★ granular
★ vibrated bed
★ humidity
★ heaping
論文目次 摘要…………………………………………………………………….…I
附表目錄………………………………………………………….…….III
附圖目錄…………………………………………………….………….IV
符號說明…………………………………………………………..… ....V
第一章 簡介…………………………………………………………..…1
1.1 粒子流簡介………………………………….……………………1
1.2 垂直振動床實驗的文獻回顧…………………………………….4
1.3 溼度對顆粒體影響的研究動機……………...………………..…5
1.4 振動床之堆積現象………………………………………...….….8
第二章 實驗設備與方法………………………………………………13
2.1 實驗設備………………………………………………………...13
2.2 實驗參數………………………………………………………...18
2.3 實驗步驟………………………………………………..……….19
2.4 堆積角量測方法………………..……………………………….20
2.5 誤差分析………………………………………………………...21
第三章 結果與討論……………………………………………………22
3.1氣體壓力對堆積現象的影響……………….…………………...22
3.2 振動加速度對堆積現象的影響………..……………………….22
3.3相對溼度對堆積現象的影響…………………………….……...24
第四章 結論……………………………………………………………30
參考文獻………………………………………………………………..32
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指導教授 蕭述三(Shu-San Hsiau) 審核日期 2002-7-18
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