Abstract Experiments were conducted for this study to investigate the effects of liquid viscosity on density-induced granular segregation in a thin rotating drum. The goal of this study is to ultimately quantify the effect of the liquid bridge force on density-induced granular segregation. The movements of the granular materials were recorded by high-resolution and high-speed cameras. Image processing technology and particle tracking methods were applied to measure the segregation index, velocities, the fluctuation velocity and granular temperatures of heavy particles. The results of the experiment indicate that by adding small amounts of liquid with varying viscosities the segregation behavior and dynamic properties of wet granular materials are significantly influenced due to the formation and rupturing of liquid bridges. The segregation behavior is mitigated with the viscosity of the liquid due to the energy dissipation caused by the formation and rupturing of the liquid bridges that increase as liquid viscosity increases. The correlation between the intensity of the segregation and the angle of repose is also discussed in this study.

中文翻译：

---

液体粘度对转鼓中密度驱动湿颗粒分离影响的研究

摘要 本研究通过实验研究液体粘度对薄转鼓中密度引起的颗粒偏析的影响。本研究的目的是最终量化液桥力对密度引起的颗粒偏析的影响。颗粒材料的运动由高分辨率和高速摄像机记录。应用图像处理技术和颗粒跟踪方法测量重颗粒的离析指数、速度、波动速度和颗粒温度。实验结果表明，通过添加少量不同粘度的液体，由于液桥的形成和破裂，湿颗粒材料的离析行为和动态性能受到显着影响。由于随着液体粘度增加而增加的液桥的形成和破裂引起的能量耗散，分离行为随着液体的粘度而减轻。本研究还讨论了偏析强度与休止角之间的相关性。