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化工学报  2014 

EMMS曳力模型及其颗粒团模型的构建和检验

DOI: 10.3969/j.issn.0438-1157.2014.06.008, PP. 2003-2012

Keywords: 两相流,流态化,数值模拟,颗粒团,曳力模型

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Abstract:

准确描述颗粒团聚特性是发展完善基于多尺度最小能量原理(EMMS)的曳力模型的重要方向之一。提出描述颗粒团聚特性的数学模型,不仅符合物理判断,而且与实验结果吻合。采用颗粒团模型,改进EMMS曳力模型,与实验及直接数值模拟结果吻合较好。改进的曳力模型与欧拉-欧拉双流体方法耦合,实现了不同工况下A、B类颗粒流化床流动特性的数值模拟。成功预测了颗粒非均匀分布特性、局部滑移速度、局部非均匀度以及噎塞状态。

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