计及温度影响的散体有效导热系数模型  

EFFECTIVE THERMAL CONDUCTIVITY MODEL OF DISPERSE SYSTEM CONSIDERING TEMPERATURE INFLUENCE

作　　者：张海林[1] 杨善让[1] 徐志明[2] 吴立锋[2] 衡世权[2] 贾瑞庆[2] 

机构地区：[1]华北电力大学,河北保定071003 [2]东北电力学院,吉林吉林132012

出　　处：《工程热物理学报》2005年第2期277-279,共3页Journal of Engineering Thermophysics

摘　　要：本文导出了基于逾渗理论并考虑温度影响的散体有效导热系数预测模型。针对孔隙中流体的传热机理,诠释了无量纲参数φ的物理意义。对SiC、SiO2和煤灰等散体材料在自行研制的实验系统上采用断电热线法测量了其在50-600℃范围内的有效导热系数。结果表明:实验值与模型预测值吻合良好,这三种散体材料的有效导热系数都随温度的增加而增大。On the basis of percolation theory, a effective thermal conductivity model of disperse system was presented considering temperature influence. The physics meaning of dimensionless parameter φ was given according to heat transfer theory in the pores. By means of the cut-out hot wire method to measure the thermal conductivity of materials, an experimental system was designed and the effective thermal conductivity of SiC, SiO2 and coal ashes was measured in the temperature range of 50-600°C. The results showed that the effective thermal conductivity of these three kinds of disperse materials increases with the temperature up and the experimental results accord with the model prediction value.

关 键 词：辐射 散体 有效导热系数 逾渗 

分 类 号：TK124[动力工程及工程热物理—工程热物理]