竖直振动下颗粒物质的行为模式研究进展

摘要

Research on behavior mode of granular matter under vertical vibration is of great significance in improving the efficiencies of chemical engineering industries. The research has been a popular topic and continuous progresses have been made in this field. The behavior modes of granular matter under vibration were summarized as granular behaviors in a vertically vibrated bed,particle climbing along the pipe inserted in the vertically vibrated granular bed,particle migration in the vibrated U-tube and particle climbing along the vertically vibrated pipe inserted in the static granular bed,and the relevant research progresses were reviewed. It was found that the motion of granular matter was still not well understood and that the mechanism lying in the granular behavior mode remained controversial. Since the discrete element method (DEM) can be used to obtain the information of individual particle motion and thus to well reflect the mechanism and behavior of granular process,the DEM simulations on behavior modes of granular matter both in a vertically vibrated U-tube and in a vertically vibrated pipe were performed to reproduce the experimental results.On this basis,it was proposed that taking advantage of the DEM,the future work should focus on the investigation of the dynamic nature of granular behavior mode and the factors affecting the granular behavior mode in order to provide theoretical foundation and method guidance for the optimization of granular transportation process.%竖直振动下颗粒物质行为模式的研究对化工过程中效率的提升具有重要意义，该研究近年来成为热点，并不断取得新进展。本文将已有竖直振动下颗粒物质行为模式研究归纳为：竖直振动颗粒床中颗粒的行为、竖直振动颗粒床中颗粒沿直管的爬升、竖直振动U形管中颗粒的迁移、静止颗粒床中颗粒沿竖直振动管的爬升，并对相关研究进展进行评述，发现目前对颗粒物质运动规律的认识还不深入，颗粒物质行为模式的内在机理上尚存争议。鉴于离散元方法（DEM）能够获得每一个颗粒的运动信息，从而很好地反映颗粒过程的机理和特性，对竖直振动U形管和竖直振动管中颗粒物质行为模式进行DEM模拟再现；据此提出在今后的研究中应充分发挥DEM的优势，深入研究颗粒行为模式的动力学本质和影响颗粒行为模式的因素，为颗粒输运过程的优化提供理论基础和方法指导。