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浙江大学学报(工学版)
J4  2010, Vol. 44 Issue (6): 1178-1184    DOI: 10.3785/j.issn.1008-973X.2010.06.024
化学工程     
埋管流化床内传热行为的微观尺度模拟研究
赵永志1, 江茂强1, 徐平2, 郑津洋1
1.浙江大学 化工机械研究所, 浙江 杭州 310027；2.浙江大学 应用力学研究所, 浙江 杭州 310027
Micro-scale simulation of heat transfer behavior in fluidized bed with immersed tube
ZHAO Yong-zhi1, JIANG Mao-qiang1, XU Ping2, ZHENG Jin-yang1
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摘要：

为了模拟埋管流化床内的流动和传热行为,将有限元方法（FEM）、基于非结构化网格的计算流体力学方法（CFD）与离散单元法（DEM）结合,建立了CFDDEMFEM耦合方法,并在此基础上采用kε湍流模型及考虑颗粒间和气固间作用的多向耦合传热模型.通过计算结果从微观尺度探讨了埋管流化床内的传热机制,分析影响床内传热的关键因素,得到换热管壁周围固含率和传热系数的分布规律,考察了流化气速对埋管周围传热系数的影响.数值模拟结果与实验结果基本一致,证实了CFDDEMFEM耦合方法模拟复杂气固流动和传热的可行性和准确性,为进一步了解流化床内热传递行为的机理、准确预测各种流化床内的传热以及开展流化床内多尺度流动传热反应流的模拟奠定基础.
Abstract:

A new coupling method, CFD-DEM-FEM method, was founded by combining finite element method (FEM), computational fluid dynamics (CFD) based on unstructured mesh, and discrete element method (DEM). The flow and the heat transfer behaviors in the fluidized bed with immersed tube were simulated by the programs based on the new method when the kε turbulence model and the multi-way coupling heat transfer model among particles, tube wall and gas were employed. The microscale mechanism of heat transfer in the fluidized bed was explored by the simulation results and the critical factors that influence the heat transfer between the tube and the bed were discussed. The profiles of average solids fraction and heat transfer coefficient around the tube were obtained and the influence of gas velocity on the transfer coefficient was revealed by simulation. The computational results agree well with the experimental data, which shows that the CFD-DEM-FEM method is feasible and accurate for the simulation of complex gassolid flow with heat transfer. And this will improve the further simulation study of the gassolid two phase flow with chemical reactions in the fluidized bed.
出版日期: 2010-07-16
:  TQ 018  
基金资助:

浙江大学优秀青年教师资助计划；国家“973”重点基础研究发展计划资助项目 (2007CB209706);中央高校基本科研业务费专项资金资助项目.
通讯作者: 徐平，女，副教授.     E-mail: pingxu@zju.edu.cn
作者简介: 赵永志（1977—），男，山东聊城人，副教授，从事多相流及流态化研究. E-mail: yzzhao@zju.edu.cn
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引用本文:

赵永志, 江茂强, 徐平, 郑津洋. 埋管流化床内传热行为的微观尺度模拟研究[J]. J4, 2010, 44(6): 1178-1184.

DIAO Yong-Zhi, JIANG Mao-Jiang, XU Beng, ZHENG Jin-Xiang. Micro-scale simulation of heat transfer behavior in fluidized bed with immersed tube. J4, 2010, 44(6): 1178-1184.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2010.06.024    或    http://www.zjujournals.com/eng/CN/Y2010/V44/I6/1178

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[1] 江茂强,赵永志,郑津洋. 非等密度颗粒气固流化床的微观尺度模拟与分析[J]. J4, 2009, 43(09): 1703-1708.