The pneumatic conveying drying process is widely used due to the high mass- and heat-transfer efficiency between the gas and solid phases, large dehydration rate, and wide range of operation conditions. The flexible ribbon particles are often involved in the pneumatic conveying drying of agricultural products, food, and biological products. These types of particles are easy to hold together due to the flexibility and the nonuniformity of ribbon shape. It is important to understand the dynamic behaviors of flexible ribbon particles in a pneumatic conveying dryer. Therefore, research on flexible ribbon particles in a pneumatic conveying dryer is necessary. However, previous studies were scarcely concerned about the particle of this special type. The flexible ribbon particles in the gas–solid fluidized bed would exist in the form of single discrete particles or clusters. Moreover, the hydrodynamic characteristics were impacted by the inhomogeneity of particle flow, which affected the performance of the pneumatic conveying dryer. In this paper, the flexible ribbon chain model was proposed, and the 3D flexible ribbon particle computing method with GPU was established. The dynamic behavior of the flexible ribbon particles was investigated in a pneumatic conveying dryer. Specially, the effects of particle flow rate, superficial gas velocity, and other parameters on the dynamic behavior of flexible ribbon particles were analyzed. The experimental verification was also performed by a fluidization test of cut tobacco particles. The results provide guidance for the further study of ribbon particles.

中文翻译：

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用于模拟气力输送干燥机中柔性带状颗粒动态行为的 3D 柔性带状链模型

气力输送干燥工艺由于气固相间传质传热效率高、脱水率大、操作条件范围广而得到广泛应用。柔性带状颗粒常用于农产品、食品、生物制品的气力输送干燥。由于带状形状的灵活性和不均匀性，这些类型的颗粒很容易聚集在一起。了解气力输送干燥机中柔性带状颗粒的动态行为非常重要。因此，有必要对气力输送干燥机中的柔性带状颗粒进行研究。然而，之前的研究很少关注这种特殊类型的粒子。气固流化床中的柔性带状颗粒将以单个离散颗粒或簇的形式存在。此外，颗粒流的不均匀性影响了流体动力学特性，从而影响了气力输送干燥机的性能。本文提出了柔性带链模型，建立了基于GPU的3D柔性带状粒子计算方法。在气力输送干燥机中研究了柔性带状颗粒的动态行为。特别分析了颗粒流量、表观气速等参数对柔性带状颗粒动态行为的影响。还通过烟丝颗粒的流化试验进行了实验验证。研究结果为带状颗粒的进一步研究提供了指导。