【作者】 李睿； 任成； 杨星团； 吴浩； 姜胜耀；

【Author】 Li Rui;Ren Cheng;Yang Xingtuan;Wu Hao;Jiang Shengyao;Institute of Nuclear and New Energy Technology of Tsinghua University, Key Laboratory of Advanced Reactor Engineering and Safety, Ministry of Education;

【机构】 清华大学核能与新能源技术研究院先进反应堆工程与安全教育部重点实验室；

【摘要】 本文利用离散单元法(DEM)进行了球床结构的数值模拟,分析了球床的堆积结构特点。随机堆积的球床中颗粒一般不能达到最密的堆积状态,出现频率最高的是配位数为8的颗粒球;不同球床的径向分布函数(RDF)具有很大的相似性;在靠近球床壁面处,径向孔隙率振荡增加;由于重力的原因,孔隙率的轴向分布与径向分布存在较大区别;通过球床局部微观结构观察,在大空间区域处堆积具有随机特点,在靠近壁面处呈现有序堆积特征。更多还原

【Abstract】 In order to analysis the structures of packed beds, discrete element method(DEM) reveals great advantages for numerical simulation. There are only few particles at densest state in random packed beds and highest frequency coordination number is 8. Moreover, there is a great similarity for radial distribution function(RDF) among various packed beds. Porosity increases rapidly with oscillation at near-wall region. More local microstructure information will be obtained. Packing characteristics at bulk region is random and ordered at wall region instead.更多还原