Multiphase flow field and mixing performance of vertical turbulent mixer
In order to research the mixing characteristics of liquid and solid particles in large-volume vertical mixer,the models of dual-axis vertical mixer and single-axis vertical mixer with coupled motion of rotating shaft and rotating drum were established.The mixing process of material inside the two types of vertical mixers was simulated by using the Euler-Euler model and RNG k-ε turbulence model in the computational fluid dynamics simulation software Fluent.Sludge and iron tailings particles were used as mixing media respectively.The flow field characteristics of fluids and volume fraction distribution of solid particles were analyzed and the effects of biaxial and uniaxial stirring on liquid-solid mixing were compared.The results show that under the same operating conditions,there is a significant difference in the flow field characteristics between the two types of mixers,and the turbulent flow effect of the fluid in the dual-axis mixer is significantly stronger than that of the single-axis mixer.Solid phase particles are distributed in a stepped pattern from top to bottom in a single axis mixer,while they are uniformly distributed throughout the dual-axis mixer.Based on the diffusion time of the tracer,it can be conclu-ded that the mixing energy consumption per unit volume of the dual-axis mixer is much lower than that of the single-axis mixer.Therefore,the mixing effect and efficiency of the dual-axis mixer are better than those of the single axis mixer.The simulation results can provide important reference for the design and optimization of large volume mixing equipment.
mixerliquid-solid two-phase flowdual-axis rotationstirring and mixingnumerical analysismixing efficiency
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