The effect of rotational speed on granular flow in a vertical bladed mixer
作者： J. Havlica , K. Jirounkova , T. Travnickova , M. Kohout
DOI: 10.1016/J.POWTEC.2015.04.035
关键词:
摘要: Abstract Granular mixing is an important unit operation used to ensure the uniformity of mixture properties. Unfortunately, mechanisms particles' motion and role parameters remain poorly understood. In this work, granular studied using computer simulations via DEM (discrete element method). The examined process approximately 42 thousand glass spherical particles with a 2 mm diameter in vertical cylindrical mixer two opposed flat blades 45° rake angle. effect different blade rotational speeds (varying from 0.1 rpm 960 rpm) on formation evolution flow patterns investigated. Examining individual particle trajectories shows that exhibit basic types periodic movements. first one, characterized by higher frequency, related stirrer. second one (lower frequency) associated recirculations plane. A methodology for their detection proposed. observed recirculation zones are secondary commonly occurring liquid cases also mechanism emergence similar. Unlike liquids, systems exhibits greater diversity zones. tangential does not create complex structures angular direction, because height layer several times than blade. For reason, we have focused only velocity distribution radial axial directions. Three global transport characteristics describing tangential, directions were Significant changes behavior these variables distinguish six dynamical regimes depending speed. These patterns.
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