Abstract The coefficient of restitution is widely used to characterize the energy loss rate in numerical simulations of discrete element modelling. The accurate input parameters can obtain the accurate simulation results for discrete element modelling. The determination of the coefficient of restitution for the single component particle is the relatively simple process, however, when considering multicomponent particles like fly-ash and humidity environment, the unpredictable property of particle after impact makes the analysis of the coefficient of restitution more complicated. This paper presents an experimental setup to determine normal coefficient of restitution using the high-speed digital camera in different humidity condition. The normal coefficient of restitution was measured for fly-ash micro-particles with different relative velocities and humidity, with a focus on collision velocities below 7 m/s. Therefore, this work focused on the effect of humidity and incident velocity on the normal coefficient of restitution.

中文翻译：

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不同湿度条件下微颗粒撞击板面法向恢复系数的实验测量

摘要 在离散元建模的数值模拟中，恢复系数被广泛用于表征能量损失率。准确的输入参数可以获得准确的离散元建模仿真结果。单组分颗粒恢复系数的确定是一个相对简单的过程，但是当考虑到粉煤灰和潮湿环境等多组分颗粒时，颗粒在撞击后的不可预测性使得恢复系数的分析变得更加复杂。本文提出了一种使用高速数码相机在不同湿度条件下确定正常恢复系数的实验装置。测量具有不同相对速度和湿度的粉煤灰微粒的正常恢复系数，重点是碰撞速度低于 7 m/s。因此，这项工作的重点是湿度和入射速度对法向恢复系数的影响。