Solids mixing plays an essential role in industrial processes. In this study, solids mixing in the bubbling fluidized bed were investigated numerically by the Eulerian-Eulerian method. The solids mixing behaviour in the bubbling fluidized bed was studied via comparison of the dispersion coefficient of particles (the mixing index). The study mainly compared the effects of design parameters (gas distributor and baffles) and operating conditions (superficial gas velocity) on the solids mixing in the bubbling fluidized bed. A baffle can improve the vertical dispersion coefficient in the upper section, while the inlet gas distributor configuration more affects the lower section. Combining both a baffle and a gas distributor does show noticeable improvement in the solids mixing.
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