Abstract

In this study, the effect of multi-density particles on granular segregation was experimentally investigated in a rotating drum. Optical cameras were used to record the motions of the granular materials. Particle tracking methods and image processing technology were used to determine the angle of repose, segregation index, and the velocities and granular temperatures of white POM (polyformaldehyde) beads (tracer particles). The experimental results showed that the final steady-state segregation index increases with the density ratio in a binary granular mixture. The results indicated that the final steady state segregation index is smaller with multi-density granular materials compared with those of materials with the binary granular mixture. The behavior of density-induced segregation is mitigated upon the addition of glass beads into the binary granular mixture. The relation between granular temperature and density-induced segregation was also discussed in this study.

Graphical Abstract

中文翻译：

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细转鼓中多密度颗粒材料的密度诱导偏析行为

摘要

在这项研究中，在转鼓中实验研究了多密度颗粒对颗粒偏析的影响。光学相机用于记录粒状材料的运动。颗粒跟踪方法和图像处理技术用于确定休止角，偏析指数以及白色POM（聚甲醛）珠（示踪颗粒）的速度和颗粒温度。实验结果表明，在二元颗粒混合物中，最终稳态偏析指数随密度比的增加而增加。结果表明，与具有二元颗粒混合物的材料相比，多密度颗粒材料的最终稳态偏析指数要小。向二元颗粒混合物中添加玻璃珠后，密度诱导的偏析行为得到缓解。这项研究还讨论了颗粒温度与密度引起的偏析之间的关系。

图形概要