空心微球结构泡沫金有效热导率的数学模型以及低温数值模拟  

Analytical and Numerical Model for Effective Thermal Conductivity of Hollow Sphere Metal Foam at Low Temperature

作　　者：刘念[1] 张颖娟[1] 杨毅[1] 贾金志 周秀文[1] LIU Nian;ZHANG Yingjuan;YANG Yi;JIA Jinzhi;ZHOU Xiuwen(Research Center of Laser Fusion,China Academy of Engineering Physics,Mianyang 621900,China)

机构地区：[1]中国工程物理研究院激光聚变研究中心

出　　处：《材料科学与工程学报》2020年第1期7-11,共5页Journal of Materials Science and Engineering

摘　　要：通过等效热阻法求得了空心微球型二维结构的有效热导率与半径、壁厚以及交错角的关系。发现有效热导率只与交错角以及壁厚与半径的比值t有关。采用Abaqus商用有限元软件建立了三维随机堆积的空心微球模型和球壳表面带孔的几何模型,计算得到在12~25K、不同t(0.016~0.022)下的三维结构泡沫金的有效热导率为1.36~1.43W/m·K;比较不同流相下泡沫金的有效热导率,发现流相的热导率对计算结果有较大影响;发现在真空中,球壳表面孔对其有效热导率的影响很小,不同孔径下有效热导率的平均绝对误差为0.021。The relationship between the effective thermal conductivity(ETC)and the radius,the wall thickness and the staggered angle of the hollow micro-sphere was obtained by the equivalent thermal resistance method.It is found that the ETC is only related to the staggered angle and the ratio t of wall thickness to radius.By using Abaqus commercial finite element software,three-dimensional(3D)random stacked hollow micro-sphere model and geometric model with holes on the spherical shell surface were established.The ETC of 3D gold foam under different t(0.016-0.022)at 12-25K was calculated as 1.36-1.43W/m·K.The effective thermal conductivity of gold foam under different flow phases was compared,and it was found that the thermal conductivity of the flow phase had great influence on the calculation results.In the vacuum,the effect of the holes on the spherical shell is very small,and the average absolute error of the ETC under different apertures is 0.021.

关 键 词：空心微球 泡沫材料 有限元分析 等效热阻法 有效热导率 

分 类 号：TK124[动力工程及工程热物理—工程热物理]