原子堆积因子
干扰
体积分数
粒状材料
球体
粒子(生态学)
结块
硬球
材料科学
集聚经济
质量分数
等球密排
物理
机械
凝聚态物理
复合材料
几何学
热力学
数学
地质学
化学工程
天文
工程类
海洋学
核磁共振
作者
José Manuel Valverde,A. Castellanos
出处
期刊:EPL
[Institute of Physics]
日期:2006-08-25
卷期号:75 (6): 985-991
被引量:63
标识
DOI:10.1209/epl/i2006-10208-4
摘要
The volume fraction ϕ of a disordered packing of noncohesive hard spheres may vary between the random loose packing at the limit of zero gravitational stress (ϕRLP ≃ 0.56) and the random close packing (ϕRCP ≃ 0.64). When interparticle attractive forces are present it is known however that ϕ can be as low as ∼ 0.01 for nanoparticles. Experimental and numerical works show that ϕ decreases as the ratio of interparticle attractive force to particle weight (Bog) is increased. We focus on the packing fraction of cohesive particles settled at the limit of zero gravity (jamming transition). From a model of particle agglomeration in suspensions we find the simple equation ϕJ ≃ ϕJ*Bog(D − 3)/(D + 2), where ϕJ* is the volume fraction of particle agglomerates at jamming, which is close to ϕRLP, and D their fractal dimension. Our experimental results on fine powders agree with this equation and show that agglomeration of particles in suspension is the relevant physical mechanism to understand the packing of cohesive particles.
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