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

化工学报 ›› 2014, Vol. 65 ›› Issue (6): 2003-2012.DOI: 10.3969/j.issn.0438-1157.2014.06.008

EMMS曳力模型及其颗粒团模型的构建和检验

陈程, 祁海鹰

清华大学热科学与动力工程教育部重点实验室, 北京 100084

收稿日期:2013-07-18 修回日期:2014-03-18 出版日期:2014-06-05 发布日期:2014-06-05
通讯作者: 祁海鹰
作者简介:陈程（1987- ），女，博士研究生。
基金资助:
国家自然科学基金项目（91334111）。

Development and validation of cluster and EMMS drag model

CHEN Cheng, QI Haiying

Key Laboratory for Thermal Science & Power Engineering of Ministry of Education, Tsinghua University, Beijing 100084, China

Received:2013-07-18 Revised:2014-03-18 Online:2014-06-05 Published:2014-06-05
Supported by:
supported by the National Natural Science Foundation of China (91334111).

摘要/Abstract

摘要： 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。

关键词: 两相流, 流态化, 数值模拟, 颗粒团, 曳力模型

Abstract: Reasonable description of cluster parameters is significant for the development of drag model for heterogeneous gas-solids flows. This study proposed the cluster model for solids concentration in clusters and the cluster size based on theoretical analysis. The profile of cluster parameters with solids concentration had a peak locating between local solids concentration of 0.1 and 0.15, indicating largest heterogeneity there. The cluster model was validated directly by experimental data. Energy minimum multiscale method (EMMS) was improved by introducing the cluster model. The improved drag model agreed well with the experiment-based empirical model. Drag correction factors of both models first decreased and then increased with increasing solids concentration, and tended to unity at extremely small solids concentration close to zero and solids concentration at minimum fluidization. The improved drag model was coupled with the two-fluid model for simulations of gas-solids flows in CFB risers containing Geldart A and B particles. Heterogeneous solids distributions, local slip velocity, local heterogeneity and choking state were predicted and agreed well with experimental results, indicating the reasonability of the cluster and drag models.

Key words: two-phase flow, fluidization, numerical simulation, clusters, drag model

中图分类号:

O359
TQ051

陈程, 祁海鹰. EMMS曳力模型及其颗粒团模型的构建和检验[J]. 化工学报, 2014, 65(6): 2003-2012.

CHEN Cheng, QI Haiying. Development and validation of cluster and EMMS drag model[J]. CIESC Journal, 2014, 65(6): 2003-2012.

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EMMS曳力模型及其颗粒团模型的构建和检验

Development and validation of cluster and EMMS drag model

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