Vo Thanh-Trung, Mutabaruka Patrick, Nezamabadi Saeid, Delenne Jean-Yves, Radjai Farhang
Bridge and Road Department, Danang Architecture University, 550000 Da Nang, Vietnam.
LMGC, Université de Montpellier, CNRS, Montpellier, France.
Phys Rev E. 2020 Mar;101(3-1):032906. doi: 10.1103/PhysRevE.101.032906.
We use particle dynamics simulations to investigate the evolution of a wet agglomerate inside homogeneous shear flows of dry particles. The agglomerate is modeled by introducing approximate analytical expressions of capillary and viscous forces between particles in addition to frictional contacts. During shear flow, the agglomerate may elongate, break, or be eroded by loss of its capillary bonds and primary particles. By systematically varying the shear rate and surface tension of the binding liquid, we characterize the rates of these dispersion modes. All the rates increase with increasing inertial number of the flow and decreasing cohesion index of the agglomerate. We show that the data points for each mode collapse on a master curve for a dimensionless scaling parameter that combines the inertial number and the cohesion index. The erosion rate vanishes below a cutoff value of the scaling parameter. This leads to a power-law borderline between the vanishing erosion states and erosion states in the phase space defined by the inertial number and the cohesion index.
我们使用颗粒动力学模拟来研究干颗粒均匀剪切流中湿团聚体的演化。通过引入颗粒间毛细力和粘性力的近似解析表达式以及摩擦接触，对团聚体进行建模。在剪切流过程中，团聚体可能会伸长、破碎或因毛细键和初级颗粒的损失而被侵蚀。通过系统地改变结合液体的剪切速率和表面张力，我们表征了这些分散模式的速率。所有速率都随着流动惯性数的增加和团聚体内聚指数的降低而增加。我们表明，对于结合惯性数和内聚指数的无量纲缩放参数，每种模式的数据点都汇聚在一条主曲线上。侵蚀速率在缩放参数的截止值以下消失。这导致在由惯性数和内聚指数定义的相空间中，消失侵蚀状态和侵蚀状态之间出现幂律边界。
