Moisture Distribution in Fluidized Beds with Liquid Injection
Moisture Distribution in Fluidized Beds with Liquid Injection
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DOI：
10.1002/ceat.201100132
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发表时间：
2011-07-01
影响因子：
2.1
通讯作者：
Palzer, Stefan
中科院分区：
文献类型：
--
作者：
Fries, Lennart;Dosta, Maksym;Palzer, Stefan
耦合离散元法-计算流体动力学 (DEM-CFD) 模拟已用于研究流化床造粒机中单个颗粒规模的流体和颗粒动力学。气体和颗粒动力学的模拟与传热和传质机制相结合，因为水分分布是流化床喷雾造粒机功能的关键参数。该模型可以监测每个颗粒的水分含量和温度以及周围气相的温度和湿度。提出了一种新颖的建模方法，使用耦合 DEM-CFD 模拟在参考时间间隔内详细描述流化床的过程动力学。气体和颗粒的运动曲线被外推到更大的时间尺度，并用于计算传热和传质。通过这种多尺度方法，朝着基于物理的造粒微观过程描述迈出了一步。
Coupled discrete element method-computational fluid dynamics (DEM-CFD) simulations have been performed to study the fluid and particle dynamics in a fluidized-bed granulator on the scale of individual particles. Simulation of the gas and particle dynamics is combined with heat and mass transfer mechanisms, as the moisture distribution is a key parameter for the functionality of a fluidized-bed spray granulator. The model allows monitoring the moisture content and temperature of each individual particle as well as the temperature and humidity of the surrounding gas phase. A novel modeling approach is presented to describe the process dynamics of a fluidized bed in full detail for a reference time interval using coupled DEM-CFD simulations. The motion profile of gas and particles is extrapolated to larger time scales and used for the calculation of heat and mass transfer. Through this multiscale approach, a step forward is taken towards a physically based description of the microprocesses in granulation.