摘要
采用DEM离散单元法,对不同转速与倾角下半封闭式回转鼓内颗粒物料的混合过程进行了模拟。通过"颗粒接触数"定义的分离指数S,分析了不同转速和倾角对回转鼓内颗粒物料径向与轴向混合特性的影响。结果表明:转速与倾角对回转鼓内颗粒物料径向与轴向混合特性有显著的影响;倾角不变,转速分别为15r/min、30r/min、45r/min时,颗粒物料的径向与轴向混合速度随转速的增加而增加,当转速超过30r/min后,增加转速对径向与轴向混合速度的影响越来越小;转速不变,倾角分别为0°、17°、34°时,增大倾角能有效的增加轴向混合速度,但对径向混合速度没有促进作用,当倾角超过17°后,轴向混合速度的增幅随着倾角的增加而逐渐变小,而径向混合速度随着倾角的增大而减小,但增加转速可以减小径向混合速度下降幅度。
In semi-closed rotating drum under different rotating speeds and inclining angle,the mixing process of granular materials was simulated by using discrete element method(DEM),and the effects of radial and axial mixing characteristic of granular materials were analyzed by using segregation index S based on particle contact-numbers.The results showed that the rotating speed and inclining angle of rotary drum have significantly affected on the radial and axial mixing characteristic of granular materials.When the inclining angle is constant and the rotating speed is 15r/min,30r/min or 45r/min,respectively,the radial and axial mixing speed increase with the addition of rotating speed.The influence of raising rotating speed is smaller and smaller on the radial and axial mixing speed while the rotating speed is over 30r/min.When the rotating speed is constant and the inclining angle is 0°,17°or 34°,respectively,increasing inclining angle has an obviously promotion to the axial mixing speed,but it has never promoted to the radial mixing speed.When the inclining angle is over 17°,the growth rate of axial mixing is becoming smaller gradually,and the radial mixing speed is decreasing with the increase of inclining angle,but the decline of radial mixing speed will reduce with the increase of the rotating speed.
作者
刘义伦
伍天翔
赵先琼
刘思琪
苏家辉
LIU Yilun;WU Tianxiang;ZHAO Xianqiong;LIU Siqi;SU Jiahui(College of Mechanical and Electrical Engineering,Central South University,Changsha 410083,Hunan,China;Light Alloy Research Institute,Central South University,Changsha 410083,Hunan,China)
出处
《化工进展》
EI
CAS
CSCD
北大核心
2018年第5期1687-1691,共5页
Chemical Industry and Engineering Progress
基金
国家自然科学基金(51375500)
长沙市科技计划重点项目(K1508090-11)
中南大学研究生创新项目(2016zzts310)
关键词
回转鼓
混合
颗粒物料
离散单元法
模拟
rotary drum
mixing
granular materials
discrete element method
simulation
