基于静态和动态休止角的超细碳酸钙离散元参数标定  

Discrete elemental parameter calibration of ultrafine calcium carbonate based on static and dynamic angle of repose

作　　者：蔡文源 王利强 徐立敏 CAI Wenyuan;WANG Liqiang;XU Limin(School of Mechanical Engineering,Jiangnan University,Wuxi 214122,China;Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology,Jiangnan University,Wuxi 214122,China;Jiangsu Innovative Packaging Technology Co.,Ltd.,Yangzhou 225600,China)

机构地区：[1]江南大学机械工程学院,江苏无锡214122 [2]江南大学江苏省食品先进制造装备技术重点实验室,江苏无锡214122 [3]江苏创新包装科技有限公司,江苏扬州225600

出　　处：《中国粉体技术》2024年第4期81-93,共13页China Powder Science and Technology

基　　金：中央高校基本科研业务费专项资金项目,编号:JUSRP21115;江苏省食品先进制造装备技术重点实验室自主研究课题资助项目,编号:FMZ202304。

摘　　要：【目的】获得超细碳酸钙准确的仿真模型参数,实现超细碳酸钙的可靠仿真研究。【方法】将超细碳酸钙精简为软质球形粒子,使用颗粒接触缩放原理与量纲分析进行颗粒缩放,采用Hertz-Mindlin with JKR接触模型,结合物理实验和离散元软件EDEM仿真实验对超细碳酸钙的静态和动态休止角进行接触参数标定。首先利用单因素实验排除对静态和动态休止角影响不显著的参数。采用Box-Behnken实验搭建静态和动态的休止角和显著性参数之间的回归模型。将实际测定的静态和动态休止角作为响应值,进而对静态和动态休止角回归模型求解获得最佳的仿真参数组合,并对得到的仿真参数进行物理实验验证。【结果】得到显著性参数的最佳组合为:超细碳酸钙-超细碳酸钙静摩擦系数和滚动摩擦系数为0.36、0.31,超细碳酸钙-不锈钢静摩擦系数和滚动摩擦系数为0.38、0.22,离散元仿真实验所得到的静态动态休止角分别为42.5°和61.3°,与实测值的误差分别为0.96%和1.32%,无明显差异。【结论】参数标定后的接触参数能够应用于超细碳酸钙离散元仿真。Objective With the rapid development of material science and engineering technology,ultrafine calcium carbonate has shown broad application prospects in various fields owning to its excellent physiochemical properties.As an important inorganic powder material,it is widely used in industries such as paper,rubber,coatings,food,and pharmaceuticals to improve and enhance product performance.Ultrafine calcium carbonate requires a parameter calibration process before conducting discrete element simulation to obtain precise simulation parameters.However,most existing simulation parameter calibration methods use the static angle of repose as a response variable,which cannot fully represent the real characteristics of ultrafine calcium carbonate.Therefore,to improve the accuracy of discrete element simulation parameters for ultrafine calcium carbonate,obtain accurate simulation model parameters,and achieve reliable simulation results,the simulation parameters of the ultrafine calcium carbonate need to be calibrated.Methods Basic parameters such as particle size distribution,surface morphology,static and dynamic angles of repose of ultrafine calcium carbonate were initially measured.Then,physical and simulation models of the static and dynamic angle of repose were developed for parameter calibration.Due to the extremely small size of ultrafine calcium carbonate,the number of particles can reach tens to hundreds of millions even in very small volumes,far exceeding the processing limit of ordinary computers.Therefore,particle scaling principle and dimensional analysis were used to scale the particles and reduce the ultrafine calcium carbonate to soft spherical particles.The Hertz-Mindlin with JKR contact model takes into account factors such as elastic deformation,friction,and adhesion,providing a comprehensive description of the contact behavior of solid surfaces at the microscopic scale.This allows for an accurate depiction of actual contact situations.The contact parameters for its static and dynamic angles of repose were

关 键 词：超细碳酸钙 休止角 粒径 参数标定 离散元 

分 类 号：TB44[一般工业技术]