快速流态化是颗粒材料工业处理过程中的重要工艺手段,在各领域中都有极广泛应用.本文利用计算流体力学离散单元方法(CFD-DEM),对典型快速流态化装置 微型流化床内的复杂气固流动现象进行尝试性模拟,模拟结果真实地还原了流化床内各个组件内复杂的气固流动特性.在此基础上,对装置内气固时均速度场、时均空隙率分布等进行了分析.发现这些统计量在入口和出口附近都有明显的波动变化,颗粒时均速度沿轴线呈反“C”型分布,装置结构对气固流动特性有重要影响.
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