Micromechanical Origin of Particle Size Segregation

We computationally study the micromechanics of shear-induced size segregation and propose distinct migration mechanisms for individual large and small particles. While small particles percolate through voids without enduring contacts, large particles climb under shear through their crowded neighborh...

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Published inPhysical review letters Vol. 118; no. 11; p. 118001
Main Authors Jing, L, Kwok, C Y, Leung, Y F
Format Journal Article
LanguageEnglish
Published United States 17.03.2017
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Abstract We computationally study the micromechanics of shear-induced size segregation and propose distinct migration mechanisms for individual large and small particles. While small particles percolate through voids without enduring contacts, large particles climb under shear through their crowded neighborhoods with anisotropic contact network. Particle rotation associated with shear is necessary for the upward migration of large particles. Segregation of large particles can be suppressed with inadequate friction, or with no rotation; increasing interparticle friction promotes the migration of large particles, but has little effect on the percolation of small particles.
AbstractList We computationally study the micromechanics of shear-induced size segregation and propose distinct migration mechanisms for individual large and small particles. While small particles percolate through voids without enduring contacts, large particles climb under shear through their crowded neighborhoods with anisotropic contact network. Particle rotation associated with shear is necessary for the upward migration of large particles. Segregation of large particles can be suppressed with inadequate friction, or with no rotation; increasing interparticle friction promotes the migration of large particles, but has little effect on the percolation of small particles.
Author Leung, Y F
Kwok, C Y
Jing, L
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  surname: Jing
  fullname: Jing, L
  organization: Department of Civil Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, China
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  surname: Kwok
  fullname: Kwok, C Y
  organization: Department of Civil Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, China
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  givenname: Y F
  surname: Leung
  fullname: Leung, Y F
  organization: Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China
BackLink https://www.ncbi.nlm.nih.gov/pubmed/28368626$$D View this record in MEDLINE/PubMed
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