Accuracy of Discrete Element Method Simulations: Rolling and Sliding Frictions Effects-Case study: Iron Ore Pellets

IF 1.1 Q3 MINING & MINERAL PROCESSING
E. Nemattolahi, A. Ghasemi, E. Razi, S. Banisi
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引用次数: 0

Abstract

DOI:10.22044/jme.2020.10208.1958 The discrete element method (DEM) has been used as a popular simulation method in order to verify the designs by visualizing how materials flow through complex equipment geometries. Although DEM simulation is a powerful design tool, finding a DEM model that includes all real material properties is not computationally feasible. In order to obtain more realistic results, particle energy loss due to rolling friction has been highlighted by many researchers using various models to implement a reverse torque. On account of the complexity of the problem, there is no unique model for all applications (i.e. dynamic and pseudo-static regimes). In this research work, an inhouse developed DEM software (KMPCDEM©) was used to assess the robustness of three models by comparing the repose angle obtained through the draw down test. The elastic–plastic spring dashpot model was then modified based on considering the individual parameters instead of the relative parameters of two contact entities. The results showed that the modified model could produce a higher repose angle. The modified model was used for the calibration of DEM input parameters in the simulation of repose angle of iron ore pellets in a laboratory setup of the draw down test. Comparison of the calibrated DEM simulation (using 0.0007 and 0.75 for the rolling and sliding friction coefficients, respectively) with the laboratory results showed a good agreement between the predicted and measured angle of repose. The non-calibrated DEM simulations are susceptible to error, and therefore, it is strongly recommended to use the laboratory experiments to characterize the materials before using the DEM simulation as a design tool of industrial equipment. Keywords
离散元方法模拟的准确性:滚动和滑动摩擦效应-案例研究:铁矿石球团
DOI:10.22044/jm .2020.10208.1958离散元素法(DEM)已被用作一种流行的模拟方法,通过可视化材料如何流经复杂的设备几何形状来验证设计。虽然DEM仿真是一个强大的设计工具,但找到一个包含所有真实材料属性的DEM模型在计算上是不可行的。为了获得更真实的结果,许多研究人员使用各种模型来实现反向扭矩,以突出滚动摩擦引起的粒子能量损失。由于问题的复杂性,没有适用于所有应用程序的唯一模型(即动态和伪静态机制)。本研究采用自主开发的DEM软件(KMPCDEM©),通过对比下拉试验获得的休止角,对三种模型的鲁棒性进行评估。在此基础上,对弹塑性弹簧阻尼器模型进行了修正,不再考虑两个接触实体的相对参数,而是考虑单个参数。结果表明,改进后的模型能产生较大的休止角。将修正后的模型用于实验室下放试验中铁矿球团休止角模拟中DEM输入参数的标定。校准的DEM模拟(滚动和滑动摩擦系数分别使用0.0007和0.75)与实验室结果的比较表明,预测和测量的休止角之间的一致性很好。未校准的DEM模拟容易出现误差,因此,强烈建议在使用DEM模拟作为工业设备的设计工具之前,使用实验室实验来表征材料。关键字
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来源期刊
Journal of Mining and Environment
Journal of Mining and Environment MINING & MINERAL PROCESSING-
CiteScore
1.90
自引率
25.00%
发文量
0
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