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.
作者
刘念
张颖娟
杨毅
贾金志
周秀文
LIU Nian;ZHANG Yingjuan;YANG Yi;JIA Jinzhi;ZHOU Xiuwen(Research Center of Laser Fusion,China Academy of Engineering Physics,Mianyang 621900,China)
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2020年第1期7-11,共5页
Journal of Materials Science and Engineering
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
hollow micro-sphere
metal foam
finite element method
equivalent thermal resistance
effective thermal conductivity
