Phase Transitions in Shear-Induced Segregation of Granular Materials

被引:58
作者
Fan, Yi [1 ]
Hill, K. M. [1 ]
机构
[1] Univ Minnesota, Dept Civil Engn, St Anthony Falls Lab, Minneapolis, MN 55414 USA
基金
美国国家科学基金会;
关键词
PARTICLE-SIZE SEGREGATION; KINETIC-THEORY; FLOW; MIXTURES; DYNAMICS; STRESS; MODEL; DENSE;
D O I
10.1103/PhysRevLett.106.218301
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We computationally study shear-induced segregation of different-sized particles in vertical chute flow. We find that, for low solid fractions, large particles segregate toward regions of low shear rates where the granular temperature (velocity variance) is low. As the solid fraction increases, this trend reverses, and large particles segregate toward regions of high shear rates and temperatures. We find that this is a global phenomenon: local segregation trends reverse at high system solid fractions even where local solid fractions are small. The reversal corresponds to the growth of a single enduring cluster of 30%-60% of the particles that we propose changes the segregation dynamics.
引用
收藏
页数:4
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