Abstract The particle-wall collision behavior for non-spherical particles has significant effects on gas-solid separation, which is important in mechanical, energy and other industries. Particle-wall collision experiments of spherical and non-spherical glass particles with polished and rough walls were conducted. The collision velocities were measured by high-speed photography, and the effects of particle sphericity and wall roughness were analyzed. The results show for large impact angles α1, the restitution coefficient e is independent of α1 and increases with increasing particle diameter. For the non-spherical particles or the rough wall, e increases when α1 is small and the friction coefficient f increases with decreasing α1. The non-spherical particles have smaller e, and larger f for small α1. The rough wall has smaller e for large α1 but greater dependence of e on α1, resulting in larger e instead for α1 → 20°. Under sliding condition, f increases with increasing wall roughness or decreasing particle diameter.

中文翻译：

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非球形颗粒的颗粒壁碰撞行为：实验研究

摘要 非球形颗粒的颗粒壁碰撞行为对气固分离具有显着影响，在机械、能源等行业具有重要意义。进行了具有抛光和粗糙壁的球形和非球形玻璃颗粒的颗粒壁碰撞实验。通过高速摄影测量碰撞速度，分析了颗粒球形度和壁面粗糙度的影响。结果表明，对于大的冲击角 α1，恢复系数 e 与 α1 无关，并且随着粒径的增加而增加。对于非球形颗粒或粗糙壁面，α1 较小时e 增大，摩擦系数f 随α1 减小而增大。非球形颗粒的 e 较小，α1 较小时 f 较大。对于大的 α1，粗糙壁的 e 较小，但 e 对 α1 的依赖性更大，导致 α1 → 20° 的 e 较大。在滑动条件下，f随着壁面粗糙度的增加或粒径的减小而增加。