Abstract Dry mixing is a common operation in many industrial processes. The unloading of the mixer is an essential aspect of the process which actively contributes to the final quality of the mixture. Its effect however is often underestimate or even ignored. In the present work the consequences of the unloading process on mixture quality were investigated in three different types of tumbling mixers: a symmetric double cone, an asymmetric double cone and a conic mixer were considered. The symmetric double cone mixer is a standard geometry in the pharmaceutical industry, while the other two geometries are unconventional. The effects of mixer geometry on the mixture quality were studied and related to differences in the unloading flow patterns. A segregating polydispersed mixture was used during the experiments in order to emphasize the different performances of the three tumblers. Additional quasi-2D experiments and FEM simulation of the unloading process clearly showed the ability of the unconventional geometries to mitigate the effect of segregation improving the mixture quality evaluated at the outlet of the mixer.

中文翻译：

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滚筒卸载过程中离析的实验和计算研究

摘要 干混是许多工业过程中的常见操作。混合器的卸载是该过程的一个重要方面，它积极地促进了混合物的最终质量。然而，它的影响往往被低估甚至被忽视。在目前的工作中，卸载过程对混合质量的影响在三种不同类型的滚筒混合器中进行了研究：对称双锥、非对称双锥和锥形混合器被考虑。对称双锥混合器是制药行业的标准几何形状，而其他两种几何形状则是非常规的。研究了混合器几何形状对混合物质量的影响，并与卸载流动模式的差异有关。在实验过程中使用了一种隔离的多分散混合物，以强调三个滚筒的不同性能。卸载过程的额外准 2D 实验和 FEM 模拟清楚地表明，非常规几何形状能够减轻离析的影响，改善混合器出口处评估的混合物质量。