DEM modeling of ball mills with experimental validation: influence of contact parameters on charge motion and power draw

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• 作者：Dominik Boemer ; Jean-Philippe Ponthot
• 关键词：Ball mill ; Discrete element method ; Contact parameters ; Experimental validation
• 刊名：Computational Particle Mechanics
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：4
• 期：1
• 页码：53-67
• 全文大小：
• 刊物类别：Theoretical and Applied Mechanics; Computational Science and Engineering; Classical Continuum Physic
• 刊物主题：Theoretical and Applied Mechanics; Computational Science and Engineering; Classical and Continuum Physics;
• 出版者：Springer International Publishing
• ISSN：2196-4386
• 卷排序：4

文摘

Discrete element method simulations of a 1:5-scale laboratory ball mill are presented in this paper to study the influence of the contact parameters on the charge motion and the power draw. The position density limit is introduced as an efficient mathematical tool to describe and to compare the macroscopic charge motion in different scenarios, i.a. with different values of the contact parameters. While the charge motion and the power draw are relatively insensitive to the stiffness and the damping coefficient of the linear spring-slider-damper contact law, the coefficient of friction has a strong influence since it controls the sliding propensity of the charge. Based on the experimental calibration and validation by charge motion photographs and power draw measurements, the descriptive and predictive capabilities of the position density limit and the discrete element method are demonstrated, i.e. the real position of the charge is precisely delimited by the respective position density limit and the power draw can be predicted with an accuracy of about 5 %.