非均质泡沫结构与导热性能的2D模拟  

2D Simulation of Structure and Thermal Conductivity of Non-homogeneous Porous Foams

作　　者：张新铭[1] 谷沁洋[1] 王济平[1] 凌娅[1] 

机构地区：[1]重庆大学动力工程学院低品位能源利用技术及系统教育部重点实验室,重庆400030

出　　处：《材料导报》2012年第24期125-128,共4页Materials Reports

基　　金：重庆市科技攻关计划资助项目(81826);"211工程"三期建设项目(S-09101);中央高校基本科研业务费资助项目(CDJXS11140014)

摘　　要：以石墨泡沫为代表的新型多孔功能材料具有低密度、高孔隙率、高导热性能等优良特性,因而受到广泛关注和研究。多孔材料的有效导热系数与孔隙结构有关,通常用孔隙率作为结构参数,但实际多孔材料的孔隙分布大多是非均匀的、随机的,因此单一的孔隙率不足以描述其孔隙结构。提出一种2D随机结构的多孔泡沫导热模型,根据大样本的有限元法数值模拟结果,指出非均质多孔泡沫的有效导热系数可表示为孔隙率和孔隙均匀度的函数。As the representative of new functional materials, graphite foam exhibits low density, high porosity, high thermal conductivity and other excellent properties, has been widely concern and study. The effective thermal conductivity of porous materials is relevant to pore structure, which is usually described by porosity. Porous materials are non-homogeneous, the pore distribution is non-uniform and random, so porosity can not express the randomness of the pore structure well. The two-dimension random models are set up, base on the finite element method（FEM） simulation with large sample, it is pointed that the effective thermal conductivity of non-homogeneous porous foam can be expressed as function of porosity and pore uniformity.

关 键 词：非均质多孔泡沫 有效导热系数 偏心因子 孔隙均匀度 

分 类 号：TB34[一般工业技术—材料科学与工程] TK124[动力工程及工程热物理—工程热物理]