Abstract CFD-DEM is an established approach to simulate spouted beds, but researchers usually focus on batch units, without commenting on the residence time distribution of the particles. In this work, we employed our validated CFD-DEM approach to simulate a continuously-fed square-based spouted bed, in the framework of the development of a scaled-up multiple unit. After analysing several flow patterns of the spouted bed, we propose three methods that permit evaluating the residence time distribution curve of the particles on the basis of the results of the simulations. These methods allow exploiting CFD-DEM's great reliability without reproducing the actual tracer experiment, which would be too time-consuming. Each method has advantages and disadvantages, but all of them were able to provide a good match of the experimental E(t) curve and may be applied to other devices as well.

中文翻译：

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连续方形喷射床的 CFD-DEM 模拟和固体停留时间分布的评估

摘要 CFD-DEM 是模拟喷射床的成熟方法，但研究人员通常关注批次单位，而不会评论颗粒的停留时间分布。在这项工作中，我们采用经过验证的 CFD-DEM 方法，在按比例放大的多单元开发框架内模拟连续进料的方形喷射床。在分析了喷射床的几种流动模式后，我们提出了三种方法，可以根据模拟结果评估颗粒的停留时间分布曲线。这些方法允许利用 CFD-DEM 的巨大可靠性，而无需重现实际的示踪剂实验，这将太耗时。每种方法都有优点和缺点，