底盤摩擦係數對剪力顆粒流動行為之影響

NCUIR > Engineering College > Graduate Institute of Mechanical Engineering > Electronic Thesis & Dissertation > Item 987654321/61206

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/61206

Title:	底盤摩擦係數對剪力顆粒流動行為之影響
Authors:	張霈賢;Chang,Pei-hsien
Contributors:	機械工程學系
Keywords:	二維剪力槽;庫葉流;邊壁運動形式;計算流體力學
Date:	2013-07-26
Issue Date:	2013-08-22 12:14:57 (UTC+8)
Publisher:	國立中央大學
Abstract:	本研究使用計算流體力學軟體ANSYS FLUENT探討顆粒體在二維剪力槽中，不同邊壁驅動形式對於顆粒體動態行為的影響。二維剪力槽為一種環狀裝置，其目的是模擬兩無窮平板之間的粒子流動，而此種類型的流動，可以視為流體力學中的庫葉流(Couette Folw)。本研究模擬剪力槽內、外邊壁單獨轉動，內、外邊壁同時同向及反向轉動四種邊壁運動形式，模擬結果與過去發表的實驗結果比較後發現其結果相當吻合。本論文亦以實驗方法探討剪力顆粒流中底盤粗糙度對粒子動態行為的影響，由實驗結果得知，當粗糙程度減小時，粒子的切向速度、粒子溫度會有較大值，此結果與過去文獻指出提升側邊壁的粗糙度來降低邊壁與粒子之間的滑移現象以提高粒子運動速度與粒子溫度，有著不同的結果。 Computational fluid dynamics software ANSYS FLUENT simulation method was used to investigate the granular dynamics in the two-dimensional shear cell with different rotational types in this study. The shear cell is a circular device and can be used to simulate the particle flow between two infinite flat plates. This type of flow can be regarded as the Couette folw. In this study we discuss the flow behaviors by rotating only inner wall or outer wall, the same direction rotation and inverse direction rotation, and we verify that the simulation results are in well agreement with the experimental results. This study also applied experimental method to investigate the effect of roughness of bottom wall on the dynamic behavior in sheared granular flow. The results show that the roughness of bottom wall plays a crucial role in the dynamic properties. The result shows that the tangential velocity and granular temperature are reduced with the increase of roughness of bottom wall due to the larger energy dissipation. The results are different with the previous studies that the dynamic properties are enhanced with the increasing the roughness of the side wall.
Appears in Collections:	[Graduate Institute of Mechanical Engineering] Electronic Thesis & Dissertation

Files in This Item:

File	Description	Size	Format
index.html		0Kb	HTML	845	View/Open

社群 sharing

Loading...