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Zhou, Jia-wei; Du, Chang-long; Liu, Song-yong; Liu, Yu
Powder technology, 11/2016, Volume: 301Journal Article
The present investigation aims at developing a gas and particle flow model based on CFD-DEM coupling for three types of swirling generators. Grid and time size dependence tests were performed to validate the numerical model; the prediction ability of the model was confirmed through comparison with experimental data. Detailed studies of certain parameters (including the fluid pattern, swirling number and pressure drop) were based on the CFD method for the three-lobed, rifle and internal spiral vanes swirling generator pipelines. These studies were performed using dimensionless forms and numerical simulations. The peak regions of the axial velocity for the three-lobed and internal spiral vanes pipes have obvious asymmetrical patterns that rotate quasi-periodically downstream; the three-lobed pipe generates the largest swirl number and decays the fastest. In addition, quantitative calculations using the CFD-DEM coupling model, which include the particle distribution and the pneumatic conveying efficiency, suggest that the three-lobed swirling generator is suitable for the preliminary conveying stage and that the internal spiral structure in this work is a favorable option for swirling pneumatic conveying systems for coarse particles. Display omitted •A quasi-periodical and asymmetrical rotating pattern in swirling flow•The three-lobed pipe has induced the largest swirl number in the three objects.•The particle dispersity increasing with inlet velocity and swirling intensity.•The three-lobed swirling generator is suitable for startup of conveying.•The internal spiral swirling generator is fit for the stabilization conveying.
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