化工学报2025，Vol.76Issue(11)：5533-5543,11.DOI:10.11949/0438-1157.20250309
基于随机弹道沉积方法的黏附性椭球颗粒疏松堆积极限的研究
Study on adhesion loose packing limit of adhesive ellipsoids based on random ballistic deposition method
摘要
Abstract
The effect of the geometric shape of ellipsoids(covering a wide aspect ratio range from 0.003 to 60)on the structure of adhesive loose packings is investigated by the random ballistic deposition method with the hit-stick-freeze assumption.Statistical results show that the packing density of spherical particles is the largest,which is 0.1469.As the particle shape deviates from spherical shape,the packing density decreases rapidly.When the aspect ratio is below 0.1 and above 10,the packing density is approximately correlated with the aspect ratio in 1 and-2 power-law relations.The local coordination number is independent of the particle shape,which not only follows the Gaussian normal distribution,but also has a common average value of 2.001.This result indicates that for packing systems of non-spherical particles controlled by short-range interparticle contact interactions,2 is the lowest coordination number for forming a mechanically stable structure.The radial distribution function shows that the local packing structure is dominated by local minor-to-major and major-to-major contact for oblate ellipsoids,and by local minor-to-minor and minor-to-major contact for prolate ellipsoids.Finally,analogous to the classical filling theory of spherical particles,a predicting correlation between the packing density and the aspect ratio is established.关键词
计算机模拟/粒子/沉积物/颗粒过程/随机堆积/非球形Key words
computer simulation/particle/deposition/particulate processes/random packing/non-spherical分类
化学化工引用本文复制引用
方筑,廖亚琴,张乾,张易阳,李水清..基于随机弹道沉积方法的黏附性椭球颗粒疏松堆积极限的研究[J].化工学报,2025,76(11):5533-5543,11.基金项目
国家自然科学基金项目(52406187,52322608) （52406187,52322608）
东方电气中央研究院企业委托项目 （）
清华大学水木学者计划项目(2022SM021) （2022SM021）
