移动散料传热数学模型

MATHEMATICAL MODEL OF HEAT TRANSFER IN GRANULAR MATERIALS

探讨了移动散料层与壁面的传热和散料间传热的机理,提出了移动散料层传热的机理模型和二维准均相数学模型.并从机理模型出发,推导出颗粒物料间传热的有效导热系数和散料层与壁面的换热系数公式.在此基础上,对模型进行数值解析,所得移动散料层内温度分布与实验结果一致,证实了本文提出的模型和公式的可用性.

In this paper, the mechanism of heat transfer in granular materials and heat exchange between the bed wall and particles near the wall are investigated. The mechanismic model and two-dimensional pseudo-homogeneous mathematical model of heat trantfer in moving granular materials are presented. Three formulas about the effective thermal conductivity and the wall heat exchange coefficient are derived. The temperature distribution in the moving bed given by numerical solution of the mathematical model agrees with that measured in the experiment. Therefore, the validity of the model and formulas is verified.