Radial segregation easily occurs in a horizontal rotating drum partially filled with particles of different properties under various operational conditions. DEM (discrete element method) simulations and experiments were combined together to investigate the segregation of bi-disperse particles of the same density but unequal sizes in a quasi-two-dimensional horizontal rotating drum. A linear spring-dashpot model was adopted in simulations. An easy and effective image analysis was conducted for the segregation/mixing of particles of different sizes. By comparing the repose angles, degrees of segregation, and particular phenomenon (“sun pattern” and reverse segregation) in simulations under different operating conditions with those in experiments, the discrete-element model is verified. The effects of rotational speed and volume ratio on radial segregation are also considered systematically. From an analysis of the results of experiments and simulations, the degree of segregation generally decreases with increasing rotational speed, whereas the volume ratio shows different influences on segregation in different flow regimes. Moreover, the mechanism underlying the reverse segregation in the cataracting regime has been clarified as well.

在水平旋转鼓中，在各种操作条件下，部分填充了不同性质的颗粒的情况下，径向偏析容易发生。将DEM（离散元方法）模拟和实验结合在一起，以研究相同密度但大小不等的双分散颗粒在准二维水平旋转鼓中的分离。仿真中采用了线性弹簧缓冲器模型。进行了简单有效的图像分析，以分离/混合不同大小的颗粒。通过比较在不同操作条件下的仿真中的休止角，偏析程度和特定现象（“太阳模式”和反向偏析）与实验中的相比，验证了离散元素模型。还系统地考虑了转速和体积比对径向偏析的影响。通过对实验和模拟结果的分析，偏析程度通常随转速的增加而降低，而体积比对不同流态下的偏析影响却不同。此外，白内障逆向偏析的机理也已经阐明。