Rotation characteristic and granular temperature analysis in a bubbling fluidized bed of binary particles

•An improved sub-grid scale model in large eddy simulation method was applied.•The particle rotational granular temperature was investigated.•The effects of restitution coefficients and binary solid composition were investigated.•The anisotropy characteristics of particles were presented.

In this work, a discrete particle model (DPM) was applied to investigate the dynamic characteristics in a gas–solid bubbling fluidized bed of binary solid particles. The solid phase was simulated by the hard-sphere discrete particle model. The large eddy simulation (LES) method was used to simulate the gas phase. To improve the accuracy of the simulation, an improved sub-grid scale (SGS) model in the LES method was also applied. The mutative Smagorinsky constant case was compared with the previously published experimental data. The simulation by the mutative Smagorinsky constant model exhibited better agreement with the experimental data than that by the common invariant Smagorinsky constant model. Various restitution coefficients and different compositions of binary solids were investigated to determine their influences on the rotation characteristics and granular temperatures of the particles. The particle translational and rotational characteristic distributions were related to certain simulation parameters.

Graphical abstractMean particle diameter distribution compared with experiment data and particle rotational velocity distribution with different bed heights. (The mass fraction of small particle was 0.3.)Figure optionsDownload full-size imageDownload as PowerPoint slide