Assessing fluidisation quality of cohesive powders using a combined continuum and discrete model

Bao Hua Xu, Richard A Williams, Ai Bing Yu

Research output: Contribution to journalArticlepeer-review


It has long been recognized that powders show four distinct types of behaviour, i.e., cohesive, aeratable, sand-like and spoutable, when fluidised. These effects are believed to be due to the variation in the relative importance of interparticle cohesive forces, such as van der Waals, capillary and electrostatic, compared with the drag force exerted on particles by a fluidising gas. However, such effects are difficult to quantify experimentally due to difficulties in the force measurements. In recent years, the Combined Continuum and Discrete Model (CCDM) has been developed to study flow of particulates where not only interactions between particle and particle but also particle and fluid are important. In CCDM, the continuum gas flow is solved by local averaged Navier-Stokes equations and the discrete solid flow by Newton's second law of motion based on Discrete Element Method with their coupling by Newton's third law of motion. This paper presents a study of the effect of interparticle cohesive forces on gas fluidisation by means of CCDM.
Original languageEnglish
Pages (from-to)189-194
Number of pages6
JournalEngineering Computations: International Journal for Computer Aided Engineering and Software
VolumeSpecial Issue
Publication statusPublished - 2002
Event3rd International Conference on Discrete Element Methods - Santa Fe, United States
Duration: 23 Sept 200225 Sept 2002


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