Application of Discrete Element Modelling (DEM) to Particulate Systems in the Process Industries
DEM is a particle-based Lagrangian simulation technology that is increasingly being deployed in design and optimisation of a broad range of industrial manufacturing operations. It is a numerical method which models the movement and contact between each particle. A DEM model particle can represent either a single particle or group of particles in the physical system. The most common and physically accurate implementation of DEM is the soft-sphere approach which calculates the forces acting on each particle using models which can account for the particle mechanical and surface properties. DEM is very well established as a powerful tool for studying the mechanics of granular bulks. Advanced DEM software tools such as EDEM can model both particles and equipment which enables direct application to complex processes. EDEM provides a framework for investigating the relative effect of particle material properties, environmental conditions and equipment design. Factors such as particle shape, surface properties (e.g. cohesion and electrostatic charge), temperature and moisture content can be accounted for using appropriate models. The authors will outline an enhanced approach where the particle nature of the solids carried within a fluid can be introduced through the use of DEM coupled with Computational Fluid Dynamics (CFD) analysis. DEM coupled with CFD is explored as an avenue to incorporate more of the physics necessary to allow multiphase CFD to address fluid-particulate systems present in the pharmaceutical, nuclear, chemical, biomedical,mineral, food and household product industries. Examples include fiuidised beds, solid-liquid mixing in stirred tanks, tablet coating and dry-powder inhalers. Advances in computing hardware and software have greatly enhanced the capabilities of DEM for modelling industrial particulate applications. It is now possible to conduct DEM simulations of over a million particles in just a few clays rather than months in the recent past. In this paper, we introduce and discuss the possibilities and advantages of using advanced DEM software for modelling process manufacturing systems involving particulate flow.
DEM CFD multiphase particle-fluid
Wai Sam Wong Richard LaRoche John Favier David Byrne
DEM Solutions Ltd.,49 Queen Street,Edinburgh,EH2 3NH,UK
国际会议
北京
英文
207-213
2008-09-24（万方平台首次上网日期，不代表论文的发表时间）