结块
渗透(认知心理学)
粒子(生态学)
材料科学
无定形固体
粒径
统计物理学
化学物理
粒度分布
渗流阈值
机械
矿物学
化学工程
化学
复合材料
物理
结晶学
地质学
工程类
神经科学
海洋学
生物
电阻率和电导率
量子力学
作者
Vasco C. Braz,André Carvalho Matias,Laurent Forny,Delphine Pasche,Vincent Meunier,Jan Engmann,Nuno A. M. Araújo
标识
DOI:10.1016/j.powtec.2022.117248
摘要
Caking in amorphous powders compromises their quality during storage. Individual particles absorb water vapor, which changes their viscosity and promotes the formation of sinter bridges. Lumps of particles grow and eventually span the whole powder, affecting the mechanical properties and quality of the powder. Previous studies of the caking dynamics largely neglect the role of spatial heterogeneities in the particle-size distribution. We perform particle-based simulations and show that, if caking is mapped into a percolation transition, the role of spatial heterogeneities is well captured by the corresponding percolation threshold. Since this threshold only depends on the geometry of the granular assembly, we can separate the contribution of the spatial heterogeneities and of the individual particle properties. This enables a rational approach for interpreting and mitigating caking propensity of commercial products consisting of particle species with different particle size distributions. We corroborate the numerical and analytical predictions with experiments.
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