中国电机工程学报2012，Vol.32Issue(2)：104-109,6.
考虑热辐射效应的泡沫金属有效导热系数数值分析
Numerical Analysis of the Effective Thermal Conductivity of Metal Foams With Thermal Radiation Effects
摘要
Abstract
The effective thermal conductivity （ETC） of metal foams is an important property for thermal designing in related engineering applications. The ETCs of FeCrA1Y open-cell foams were studied by solving the conductive- radiative heat transfer equations based on simplified geometrical models. The results based on the sphere-subtracted structure and that based on traditional structures with uniform ligaments were compared, and the effects of porosity, pore size and bulk mean temperature on ETCs were analyzed. The results show that the cell morphology affects the ETCs significantly, which implies the variations of ETCs can not just be studied by changing the porosity and pore size. Thermal radiative heat transfer is the dominant heat transfer mode at high temperature. The ETC becomes more sensitive to the temperature with the increase of porosity and pore size. Larger porosity, smaller pore size and lower temperature will lead to a lower ETC. It is demonstrated that direct numerical simulation based on simplified models is an efficient way to estimate the ETCs of metal foams for academic and engineering applications.关键词
泡沫金属/有效导热系数/热辐射/数值模拟Key words
metal foams/effective thermal conductivity/thermal radiation/numerical simulation分类
能源科技引用本文复制引用
张文杰,谭建宇,赵军明,刘林华..考虑热辐射效应的泡沫金属有效导热系数数值分析[J].中国电机工程学报,2012,32(2):104-109,6.基金项目
国家自然科学基金项目(50836002,50906017). （50836002,50906017）
