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超重力旋转床能够显著强化反应与分离过程,在传统化工、环保、能源等领域得到广泛应用,对其微观混合的研究有助于刻画其微观层次的混合、传质机理。本文根据旋转填充床流体流动与反应传质过程的固有特性,构建三环境模型描述其内部的微观混合和传质情况。模型模拟结果与实验结果吻合较好,确证三环境模型应用描述旋转床微观混合、传质是可行的。分析探讨了旋转床内流体流动、三环境体积分率p_n对微观混合程度的影响、不同体积比及不同转速对离集指数的影响。研究结果加深了对旋转填充床内微观混合、传质的理解,为后续研究提供理论基础。
The supercritical rotating bed can remarkably enhance the reaction and separation process and is widely used in the fields of traditional chemical industry, environmental protection, energy and so on. The research on its micromixing helps to depict the mixing and mass transfer mechanism at the microscopic level. In this paper, based on the inherent characteristics of fluid flow and mass transfer in a rotating packed bed, a three-environment model is constructed to describe the internal micro-mixing and mass transfer. The model simulation results are in good agreement with the experimental results. It is concluded that the application of the three environmental models to micro-mixing and mass transfer of rotating beds is feasible. The influences of the fluid flow in the rotating bed, the influence of the three environmental volume fraction p_n on the microscopic mixing degree, the different volumetric ratios and the different rotational speeds on the separation index were analyzed. The results deepen the understanding of the microscopic mixing and mass transfer in a rotating packed bed and provide a theoretical basis for subsequent research.