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• Main Authors: Po Han Huang, 黃柏翰
• Other Authors: 蕭述三
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/3up2t4

碩士 === 國立中央大學 === 機械工程學系 === 107 === A double-wall rotating drum was used to investigate segregation phenomena in this research. The effects of fill rate and rotation speed on segregation index in the rotating drum were discussed by experimental method in the paper. The steady state value of segregation index remain the same which represent the small particle located on inside and big particle on outside when the rotation speed is low. As the rotation beyond the critical value, the segregation phenomena would change to mixing state. After that, segregation index decrease with the increase of rotation speed. The critical value of rotational speed would decrease when fill rate decrease. A high-speed camera was used to capture the velocity field in this research. The result shows that when segregation index was approximately to 1, the fluctuation of particles would concentrate at the tiny area which located on nearly the outside wall of the drum. The level of that fluctuation was also very high. When segregation index was approximately to 0, the fluctuation of particles would concentrate at the area which located on the zone between outside wall and the middle. When segregation index was between 0 and -1, the fluctuation of particles would concentrate at the area which located on the zone between the middle and inside wall.