| 研究生: |
藍亦熒 Yi-Ying-Lan, |
|---|---|
| 論文名稱: |
二元乾燥顆粒混合物於二維旋轉漏槽中阻塞現象之研究 Jamming analysis of a binary dry granular mixture in a two-dimensional rotating hopper |
| 指導教授: |
方中
Fang, Chung |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 土木工程學系 Department of Civil Engineering |
| 論文出版年: | 2016 |
| 畢業學年度: | 104 |
| 語文別: | 中文 |
| 論文頁數: | 124 |
| 中文關鍵詞: | 長寬比 、阻塞機率 、拱阻塞 、開口跨距 、混合顆粒 |
| 外文關鍵詞: | Aspect ratio, Jamming probability, Arch jamming, Opening span, mixed grain |
| 相關次數: | 點閱:68 下載:0 |
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本實驗之目的是藉由改變顆粒之重力方向,去得到不同顆粒長寬比在不同邊界條件下之阻塞機率與拱阻塞之行為。在實驗過程中主要之參數變化有顆粒長寬比與實驗坡度θ、漏槽之開口大小,其中漏槽之開口大小是影響顆粒阻塞行為中最直接之因素,其他參數亦有可能影響實驗之結果,例如顆粒材質、轉盤轉速、顆粒數量、實驗次數、顆粒之排列方式等。
當顆粒長寬比增加,阻塞現象愈容易發生,因顆粒長寬愈大時,顆粒較細長,因此顆粒與顆粒間有較大之接觸面,當接觸面積增大,產生的接觸點亦較多,因此阻塞機率愈高。當長寬比愈大時,顆粒成拱數之範圍亦較大。原因為長寬比愈大顆粒較易產生顆粒偏轉現象,此時X向跨距會發生在橢圓顆粒之長軸上,導致顆粒數較少之情況發生。
3種坡度中,當顆粒長寬比較小時,斜率變化皆較大,而在長寬比3時,斜率變化皆較小,表示長寬比愈小,對開口寬度d之變化較敏感。比較3種坡度之阻塞機率,30°之阻塞機率最大,原因在於坡度較小時顆粒流動較順利,不易阻塞,故阻塞機率較低。
在混合顆粒實驗中,長寬比3之阻塞機率較混合顆粒高,原因為當顆粒皆為長寬比3時,顆粒間有較大之接觸面,接觸點較多,故阻塞機率較高。
The purpose of the study is on the influence of mixed ratio of binary dry granular mixture on the jamming probability in a rotating 2D hopper.
The 2D rotating hopper is self-constructed, with adjustable hopper slope and hopper opening. The elliptical grains with different aspect ratios are equally constructed. Both the hopper passage and elliptical grains are made of Plexiglass.
The parameters in the experiment are the aspect ratio of the elliptical grains, the experimental slope θ, the other parameters such as grain material, rotating speed, amount of grains, the number of the experiment done, the arrangement of the grains etc.
When the aspect ratio increases, the jamming probability increases corresponding, because the grains are relatively thin, therefore the contact points between the grains are increased. When the aspect ratio increases, it will increase the range of the arch numbers, because the higher aspect ratio of the grains is easier to occurs grains deflection phenomenon.
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校內:2021-08-10公開