Abstract
Coarse particles in liquid-solid freight pipelines form a highly concentrated zone or moving bed near the bottom of the pipe and a large part of the energy seems to be dissipated by the particles coming into contact with each other. The DEM (Distinct Element Method) mayprovide some insight into the mechanisms governing dense phase solid-liquid flows. This method can deal with collisions of many bodies and long time contact. The aim of the presentpaper is to apply this method to solid-liquid flows. As preliminary work for simulating solid-liquid flows in a freight pipeline, the motion of descending glass beads (10mm in meandiameter) in water was simulated in an hourglass-like tube. The selection of the DEM modeland the coefficients of interparticle and particle-wall friction are also discussed in this paper. Although there are some slight differences between the simulation and the measurement, the simulation satisfactorily represents the overall motion of descending particles.The DEM proved to be an effective tool for providing an inside view of highly concentrated solidliquid flows.
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