转筒中两种形状颗粒的雪崩过程对比

Comparison of the avalanche process of two shaped particles in a drum

为了研究颗粒形状对转筒内颗粒雪崩运动过程的影响,采用散斑能见度光谱法(SVS)和图像法测量了粒径均为0.5 mm的球形颗粒和不规则颗粒的间歇性雪崩运动过程。研究结果表明,球形颗粒雪崩过程与不规则颗粒不同,不规则颗粒会发生单压实和双压实两种压实现象,填充率不同双压实现象的出现概率不同。单、双压实的持续时间也与填充率存在不同比例关系。同时研究发现不规则颗粒的倾斜角大于球形颗粒的倾斜角,而不规则颗粒压实前颗粒堆积的重力势能越大,越容易发生双压实现象。

In order to study the influence of particle shape on the avalanche movement process of particles in the drum,we use the speckle visibility spectroscopy and image method to measure the intermittent avalanche movement of spherical particles and irregular particles with a diameter of 0.5 mm.The research results show that the avalanche process of spherical particles is different from that of irregular particles.Irregular particles will have two compaction phenomena,single compaction and double compaction,and the probability of occurrence of double compaction phenomenon is different under different filling degrees.The duration of single and double compaction also has a different proportional relationship with the filling degree.Additionally,it is found that the tilt angle of irregular particles is larger than that of spherical particles,and the larger the gravitational potential energy of the particle accumulation before compaction of irregular particles,the easier it is to produce double compaction.