Modelling and experiments of wet granular flows in rotating drums
Seminar Room 1, Newton Institute
AbstractIn addition to its wide usage in industry as mixers and kilns, rotating drums partially filled with granular materials is a prototypical systems for studying fundamentals of dynamics and mixing in dense granular flows. This study incorporates pendular liquid-bridge forces into a nonlinear soft-sphere discrete element method (DEM) to investigate the behavior of wet granular materials in rotating drums under the rolling flow regime. Simulations with two- and three-dimensional flow fields are compared and the importance of three-dimensional effects are evaluated. Simulated results, including the dynamic angle of repose and the time-averaged velocity profiles at the bed surface and along the bed depth, are validated against a series of experiments based on application of particle image velocimetery (PIV) to a quasi-two dimensional (i.d.120mm×10mm) rotating tumbler. The roles of rolling and sliding frictions are compared, and a model of resistance to rolling is developed for a better prediction of granular velocity. Particularly, the influence of dimensionless liquid bridge volume on behavior of wet granular materials in both the active layer and the plug-flow region is investigated.
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