粒径呈幂律分布的颗粒气体中的颗粒分离行为特性

摘要

采用分子动力学方法模拟了受到边界振动的粒径呈幂律分布的颗粒气体中的颗粒分离行为特性.研究发现当系统受到振动时,模拟区域出现温度梯度,系统出现颗粒分离现象,所有的颗粒都会朝着温度低的区域移动,且大颗粒比小颗粒更趋向于聚集在低温区域;系统大颗粒和小颗粒间的粒径差越大,系统的颗粒分离行为越显著.同时,系统的子区域中的局域粒径分布函数仍然为幂律分布.%Using the molecular dynamics simulations,the segregation behavior of a vibrated two-dimensional granular system with a power-law particle size distribution is investigated.Species segregation is observed.It is found that larger particles have a greater extent of condensation in the low-temperature regions than the smaller particles.The granular segregation is more significant with the increase of disparity in particle size.Furthermore,the local particle size distribution maintains the same form as the overall size distribution.