摘要
采用实验、模拟及理论的分析方法,研究了在圆形混合器、椭圆形混合器、正方形混合器中,不同转速和填充率条件下,容器形状对二元颗粒体系分聚与混合的影响.实验中通过改变转速与填充率,可获得不同的颗粒分聚与混合图样,对示踪颗粒运动轨迹的分析发现,在圆形混合器中,随着混合器转速的增大,颗粒在径向的随机性减少;在正方形混合器中,随着混合器转速的增大,颗粒在径向的随机性增大.模拟结果发现颗粒流动分为两个区域,在表面的快速流动和在整体的旋转运动.通过理论分析发现颗粒分聚在圆形混合器中最明显,在正方形混合器中最弱,椭圆形混合器介于二者之间.
The effects of filling conditions and angular speeds of circle, ellipse and square mixers on segregation and mixing are studied adopting theoretical, experimental and simulation approaches. Different segregation and mixing patterns of granular material can be obtained by changing the angular speed or filling conditions in experiments. From the analysis of trajectory of tracer particles, we find that particles＇ motion randomness in radial direction decreases with the angular speeds augment, and contrast results occur in rectangular mixer. The simulation results show that the flow consists of two distinct regions： a flowing layer with nearly unidirectional flow and a bed below it undergoing solidbody rotation. Through theoretical analysis, we find the segregation phenomenon is most apparent in circle mixer, then in the ellipse mixer, and the weakest is in rectangular mixer.
出处
《力学学报》
EI
CSCD
北大核心
2016年第1期64-75,共12页
Chinese Journal of Theoretical and Applied Mechanics
基金
国家自然科学基金(11274354,11275156,91226101,11474326)
地震行业科研经费(201208011)
中国科学院空间科学战略性先导科技专项(XDA04020200)资助项目
关键词
颗粒体系
分聚与混合
模拟
granular system
segregation and mixing
simulation
