化工学报 ›› 2012, Vol. 63 ›› Issue (3): 698-704.DOI: 10.3969/j.issn.0438-1157.2012.03.004

• 流体力学与传递现象 • 上一篇    下一篇

基于颗粒尺度的离散颗粒传热模型

卜昌盛,陈晓平,刘道银,段钰锋   

  1. 东南大学能源热转换及其过程测控教育部重点实验室,能源与环境学院
  • 收稿日期:2011-07-12 出版日期:2012-03-05 发布日期:2012-03-05
  • 通讯作者: 陈晓平

Heat transfer model for particles with discrete element method

BU Changsheng,CHEN Xiaoping,LIU Daoyin,DUAN Yufeng   

  • Received:2011-07-12 Online:2012-03-05 Published:2012-03-05

摘要: 颗粒间传热在诸多工业过程中有着十分重要的作用。详细考虑颗粒间传热机理,对颗粒间各传热途径建模,包括颗粒内部导热、颗粒粗糙表面传热、颗粒表面气膜及接触颗粒间隙气膜传热,并与离散颗粒模型(DEM)耦合,建立颗粒尺度下离散颗粒传热模型。以固定床为对象,考察颗粒粒径、颗粒比热容、颗粒热导率及压缩负载对固定床有效传热系数的影响,并将本文计算值和文献的实验值及模型预测值对比,结果表明,该模型可定量预测固定床有效传热系数。本文建立的离散颗粒传热模型为合理预测颗粒体系内的传热提供了一种有效方法。

关键词: 颗粒尺度, 离散颗粒模型, 传热, 固定床

Abstract: Heat conduction in granular assemblies plays an important role in industrial applications. In this paper, the details of heat transfer mechanism are considered in particle scale. The conduction resistances of solid interior, rough surface, gas film between solids, and gas-gap between contacted surfaces are modeled and coupled with discrete element method to deduce a heat transfer model. Numerical simulations are performed to investigate the effects of particle diameter, specific thermal capacity, thermal conductivity of particles and compressive load on effective thermal conductivity(ETC) in fixed beds. The predicted ETC is compared with experimental and simulated data in literature, indicating that the presented model can predict ETC satisfactorily, which provides a useful tool for studying heat transfer in particle assemblies.

Key words: particle scale, discrete element method;heat transfer;fixed beds

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