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为深入了解结晶器内复杂的流动情况及其对混合的影响,采用CFD(Computational Fluid Dynamics)软件模拟DTB结晶器内稳态单相流动过程和不同混合方式的多相流动过程。对不同搅拌桨在结晶器内单相流动作用时采用湍流模型中的标准k-ε双方程模型、MRF;在此基础上模拟4种不同混合方式对颗粒性质的影响时引入欧拉多相流模型,并分析其不同混合方式产生的不同剪切作用对颗粒粒度的影响,并分析产生影响的微观作用机理。结果表明,考虑颗粒在结晶器内所受剪切力的状况和悬浮状况有利于制备理想性质的颗粒。
In order to understand the complicated flow in the mold and its influence on mixing, CFD (Computational Fluid Dynamics) software was used to simulate the steady-state single-phase flow and multi-phase flow in different mixed mode of DTB crystallizer. The standard k-εtwo-equation model and MRF in turbulent model were used to simulate the effect of four different mixing modes on the particle properties of the impeller in the single-phase flow in the mold. The effects of different shearing effects on the particle size were analyzed and the microscopic mechanisms influencing them were analyzed. The results show that taking into account the particle shear force in the mold condition and suspension conditions conducive to the preparation of the desired properties of particles.