报告题目 Particle Shape Matters! - Packing and Flow of Ellipsoidal Particles

报告人：周宗彦 高级讲师，澳大利亚蒙纳士大学化工学院

时  间：2018年8月13日 10：00-11：00

地  点：大连理工大学综合1号实验楼602会议室

报告摘要

Particle shape is one of the most important properties of particles, and it affects the packing and flow structures that are critical to transport properties such as permeability related to pore connection and thermal conductivity related to particle connection. Particle shape can be regular or irregular. In particular, ellipsoids attract a lot of attention in recent years as it can represent a large number of shapes, e.g. from platy to elongated. In this presentation, I give a brief review of studies of ellipsoidal particles on the basis of discrete element method, and examine the effects of particle shape in some typical particulate systems, including: (1) particle packing, focusing on how aspect ratio affects packing density and structures; (2) hopper flow, demonstrating the dependence of discharging rate and wall stress on particle shapes; (3) sandpile formation, focusing on how aspect ratio affects the angle of repose and stress dip distribution; and (4) fluidization, illustrating how particle shape affects the bed permeability, orientation, and bed flow/force structures. The results show that discrete element method for ellipsoids provides a useful approach to investigate shape effect on the behavior of granular materials.

个人简介

周宗彦，东北大学工程学士(1996)和硕士(2000)，新南威尔士大学博士(2007)，目前系澳大利亚蒙纳士大学化工学院高级讲师。周宗彦博士长期从事于粉体系统、粉体-流体多相流动系统和传热传质的基础研究，以及各种工业过程的应用研究。在模型理论方面完善了CFD-DEM耦合模型理论,探讨双流体模型中颗粒相的本构关系,以及气固两相流中微细颗粒的流动状态;将CFD-DEM耦合模型拓展到传热传质的研究,建立了基于CFD-DEM的详尽的数学模型来探讨传热机理,探讨颗粒的软化和熔化行为；对颗粒系统中非球形颗粒行为的基础研究，建立了可以用来模拟非球形颗粒的离散单元模型，探讨颗粒形状对颗粒堆积及流动行为和传热的影响；针对冶金过程(如高炉和非高炉炼铁)建立了基于离散元法的数学模型来探讨高炉布料和炉内物料流动，预测高炉内部传热传质行为。近年来，周博士出色地主持或参与了多项澳大利亚科研基金，已在高水平国际期刊发表了60多篇SCI论文，被国内外同行引用达2600多次。多次受邀特邀报告或大会报告，担任重要学术会议秘书、技术委员会委员、以及分会主席等，受邀担任澳大利亚科研项目评审和10多种国际权威学术刊物评审专家。