Abstract

The spouted bed provides efficient gas-solid contact, favoring heat and mass transfer. Thus, it has been applied to various physical and chemical processes. In this work, the effects of six cone angles (28°, 30°, 45°, 60°, 75°, and 90°) on the fluid dynamics of a spouted bed with sorghum grains were analyzed by CFD-DEM. Based on fluid dynamics principles, the objective was to identify better configurations for the drying process performance. Smaller cone angles provided better solids circulation, with a higher mass transfer coefficient (k_c), granular temperature (gt), and solids mass flow rate (W_s), together with a shorter cycle time (t_c). For the range of cone angles analyzed, increase of the cone angle reduced W_s by about 75% and increased t_c 4-fold.

摘要

喷射床提供有效的气固接触，有利于传热和传质。因此，它已应用于各种物理和化学过程。在这项工作中，通过 CFD-DEM 分析了六个锥角（28°、30°、45°、60°、75°和 90°）对高粱颗粒喷动床流体动力学的影响。基于流体动力学原理，目标是确定干燥过程性能的更好配置。较小的锥角提供更好的固体循环，具有较高的传质系数 (k _c )、颗粒温度 (gt) 和固体质量流量 (W _s )，以及较短的循环时间 (t _c )。对于分析的锥角范围，锥角的增加减小了 W _s约 75%，t _c增加4 倍。