Comparative study of two fluid model and dense discrete phase model for simulations of gas-solid hydrodynamics in circulating fluidized beds
Comparative study of two fluid model and dense discrete phase model for simulations of gas-solid hydrodynamics in circulating fluidized beds
复制标题
循环流化床气固流体动力学模拟的二流体模型与致密离散相模型对比研究
DOI：
10.1016/j.partic.2020.05.001
复制
发表时间：
2021-02-03
期刊：
影响因子：
3.5
通讯作者：
Chen, Xiaoping
中科院分区：
文献类型：
--
作者：
Wu, Ying;Liu, Daoyin;Chen, Xiaoping
计算流体动力学（CFD）已成为研究循环流化床（CFB）中复杂气固流体动力学的重要工具。本文基于欧拉-欧拉框架下的二流体模型（TFM）和欧拉-拉格朗日框架下的致密离散相模型（DDPM），对两种不同模型下的CFB立管内气固流体动力学进行了对比研究。结果表明，DDPM可以用来预测循环流化床内的气固流体动力学，但TFM和DDPM之间存在差异，特别是在固相径向分布剖面上。敏感性分析结果表明，气固阻力模型对两种模型的结果都有显着影响。 TFM 中的镜面反射系数和恢复系数，以及 DDPM 中的反射系数和包裹数对模拟结果的影响较小。 (C) 2020 由Elsevier B.V.代表中国颗粒学会、中国科学院过程工程研究所出版。
Computational fluid dynamics (CFD) has become a valuable tool to study the complex gas-solid hydrodynamics in the circulating fluidized bed (CFB). Based on the two fluid model (TFM) under the Eulerian-Eulerian framework and the dense discrete phase model (DDPM) under the Eulerian-Lagrangian framework, this work conducts the comparative study of the gas-solid hydrodynamics in a CFB riser by these two different models. Results show that DDPM could be used to predict gas-solid hydrodynamics in the circulating fluidized bed, and there are differences between TFM and DDPM, especially in the radial distribution profiles of solid phase. Sensitivity analysis results show that the gas-solid drag model exhibits significant effects on the results for both the two models. The specularity coefficient and the restitution coefficient in the TFM, as well as the reflection coefficient and the parcel number in the DDPM, exhibit less impact on the simulated results. (C) 2020 Published by Elsevier B.V. on behalf of Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences.