Abstract
• Analyzed gas jet penetration in packed bed and particle entrainment into the jets. • Reconstructed collision energy spectra from statistical kinetic theory-based approach. • Calculated local attrition rate using first moment of local collision energy spectra. • Evaluated steady state attrition of grid jet attrition device. • Discussed published jet-induced attrition mechanisms and proposed an additional one. The flow dynamics, collisional behavior and attrition rates of a grid jet attrition unit are computationally investigated using a kinetic theory-based approach. Profiles of the flow statistical properties are presented and discussed to describe the jet dynamics. Attrition behavior and rates are analyzed from the local reconstruction of the collision energy spectra. The commonly used jet-induced attrition mechanisms which involve the entrainment of the particles into the jet followed by their acceleration and collision at the jet tip is reproduced by the CFD calculations in this work. Supported by the local attrition rates, it is shown that the shear-based collisions around the jets, due to counter-current particle axial motions, are an additional jet-induced mechanism generating more fines than at the jet tips.
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