Effects of Interstitial Liquid and Sphere Size on the Development of a Steady Granular Flow in a Rotating Drum
Date Issued
2010
Date
2010
Author(s)
Yang, Chih-Yao
Abstract
This thesis focuses on the unsteady motion of dry and wet granular flow in a rotating drum using solid spheres of identical material but two different sizes. The mixture bulk behavior was recorded by a high-speed digital camera and the obtained digital images were analyzed for the segregation phenomenon. Particular efforts were made to identify possible liquid effects on modifying the bulk behaviors. To achieve this, the algorithm of an existing Circular Hough transformation routine was modified to locate the motions of the two species. The mixture bulk behavior was obtained by coarse-graining spatial average. The investigated bulk behavior include repose angle, flowing layer thickness, volume fraction, intensity of segregation and granular temperature. The repose angle increased with increasing rotating speed. At the same rotating speed but different interstitial liquid, wet granular bulk velocity profile will smaller than dry granular. About segregation phenomenon, wet granular will occur delay than dry granular. At the low rotating speed condition, no matter dry or wet granular, the segregation phenomenon will occur lately.
Subjects
Rotating Drum
Granular Flow
Hough Transformation
PTV
Intensity of Segregation
Interstitial Liquid Effects
Type
thesis
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