旋轉鼓內漿態顆粒分離與流動行為之探討 ; The investigation about segregation and dynamic properties in slurry rotating drum

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Title:	旋轉鼓內漿態顆粒分離與流動行為之探討;The investigation about segregation and dynamic properties in slurry rotating drum
Authors:	吳政倫;Zheng-Lun Wu
Contributors:	機械工程研究所
Keywords:	顆粒流;液體黏度;填充率;安息角;分離;Granular flow;liquid viscosity;segregation;angle of repose;filling ratio
Date:	2011-01-26
Issue Date:	2011-06-04 15:01:33 (UTC+8)
Publisher:	國立中央大學
Abstract:	本研究是以類二維的精密旋轉鼓為實驗設備，並以實驗的方式分別針對在當顆粒和顆粒的間隙被液體完全充滿時，針對在不同填充率下，間隙流體黏度對於顆粒的分離現象、安息角(angle of repose)和流動型態的探討，與在相同填充率但不同黏度條件下，旋轉鼓中顆粒的分離現象和安息角關聯性的探討。實驗結果顯示添加之液體量為飽和態(slurry)，在相同顆粒填充率的情況下，隨著間隙流體黏度越大，分離強度越低，用於抵抗因為顆粒重量產生的下滑力的力量將越大，因此安息角角度將會隨之增加。在固定間隙流體黏度的情況下，隨著填充率的增加，分離強度值會隨之變大，分離速率則會隨之變小。隨著間隙流體黏度越大，顆粒之流動型態從滾動型態(rolling)轉變成翻滾型態(cascading)，但是當填充率較低的情況下，若顆粒的流動形態要從滾動型態(rolling)轉變成翻滾型態(cascading)則需要更高的間隙流體黏度。 A quasi-2D rotating drum is used to investigate segregation phenomena in this study. The effects of viscosity of interstitial fluid and filling ratio on segregation mechanism, repose angle and flowing behavior are experimental studied in this thesis. The relation between segregation index and repose angle is also discussed. The result shows that segregation index decreases and repose angle increases with the increase of interstitial fluid viscosity under the same filling ratio. The result also indicates that segregation index is larger and segregation rate becomes smaller as the filling ratio increases with the same viscosity of interstitial fluid. Finally, the result shows that the flowing regime changes from rolling regime to cascading regime with increasing the interstitial fluid viscosity.
Appears in Collections:	[Graduate Institute of Mechanical Engineering] Electronic Thesis & Dissertation

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