摘要
采用有限体积法,对空气导热系数可变的多孔绝热材料进行三维数值实验分析。构建细胞模型,推导热传导方程及边界条件,进而结合多孔绝热材料特点,得到共轭热传导方程。对共轭热传导方程进行求解,以相对导热系数为衡量标准,探讨在不同空气导热系数下,在三角形、椭圆形、菱形、T形和I形五种孔隙形状下,多孔绝热材料的绝热性能。研究发现:1)多孔绝热材料相对导热系数随着空气导热系数的增大而增大;2)在垂直于有效接触面积较大的热通量方向上,I形孔隙和T形孔隙是降低多孔绝热材料相对导热系数的最佳形状。
The Finite Volume Method(FVM)is used to analyze the porous insulation materials with variable air thermal conductivities.The cell model is established,the heat conduction equation and boundary conditions are derived,and then the conjugate heat conduction equation is obtained.By solving the conjugate heat conduction equation and taking the relative thermal conductivity as the standard,the thermal insulation performances of porous insulation materials with different air thermal conductivity as well as 5 pore shapes,namely,triangle,ellipse,diamond,T-shape and I-shape are discussed.The studies show that:1)the relative thermal conductivity of porous insulation materials increases with the increase of air thermal conductivity;2)perpendicular to the direction of heat flux with larger effective contact area,the I-shaped and T-shaped pores are the best pore shapes to reduce the relative thermal conductivity of porous insulation materials.
作者
邱潇薇
汪晓雪
王小见
QIU Xiao-wei;WANG Xiao-xue;WANG Xiao-jian(Lanzhou Jiaotong University,Lanzhou 730070,China)
出处
《工业技术创新》
2020年第2期93-96,共4页
Industrial Technology Innovation
关键词
多孔绝热材料
孔隙形状
空气导热系数
相对导热系数
共轭热传导方程
细胞模型
有限体积法
Porous Insulation Material
Pore Shape
Air Thermal Conductivity
Relative Thermal Conductivity
Conjugate Heat Conduction Equation
Cell Model
Finite Volume Method
