Soft particle clogging in two-dimensional hoppers
Soft particle clogging in two-dimensional hoppers
复制标题
软颗粒堵塞二维料斗
DOI：
10.1103/physreve.104.044909
复制
发表时间：
2021
影响因子：
2.4
通讯作者：
Weeks, Eric R.
中科院分区：
文献类型：
--
作者：
Tao, Ran;Wilson, Madelyn;Weeks, Eric R.
我们通过实验和模拟研究了软颗粒通过准二维料斗的流出。实验使用由水凝胶、硅橡胶和玻璃制成的球体。料斗室具有可调节的出口宽度和倾斜角度（后者用于控制重力的大小）。我们的模拟使用具有粘性相互作用但没有摩擦的纯二维软粒子来模拟实验。模拟和实验的结果表明，重力减小或颗粒较硬时更容易堵塞。对于低摩擦力或无摩擦力的颗粒，堵塞拱中的平均颗粒数仅取决于料斗出口宽度与平均颗粒直径之间的比率。相反，对于具有较大摩擦相互作用的硅橡胶颗粒，拱形比低摩擦情况具有更多颗粒。此外，对堵塞发生时留在料斗中的颗粒数量的分析提供了静水压力效应的证据，该效应与软颗粒的堵塞有关，但对于较硬的（玻璃）或摩擦性（硅橡胶）颗粒的堵塞则较少。
We study the outflow of soft particles through quasi-two-dimensional hoppers with both experiments and simulations. The experiments utilize spheres made with hydrogel, silicone rubber, and glass. The hopper chamber has an adjustable exit width and tilt angle (the latter to control the magnitude of gravitational forcing). Our simulation mimics the experiments using purely two-dimensional soft particles with viscous interactions but no friction. Results from both simulations and experiments demonstrate that clogging is easier for reduced gravitational force or stiffer particles. For particles with low or no friction, the average number of particles in a clogging arch depends only on the ratio between hopper exit width and the mean particle diameter. In contrast, for the silicone rubber particles with larger frictional interactions, arches have more particles than the low friction cases. Additionally, an analysis of the number of particles left in the hopper when clogging occurs provides evidence for a hydrostatic pressure effect that is relevant for the clogging of soft particles, but less so for the harder (glass) or frictional (silicone rubber) particles.