论文部分内容阅读
为了提高泡沫多孔材料有效导热系数的数值计算精度,文章提出一种用计算机软件处理泡沫多孔材料电镜图,计算泡沫多孔材料的体积分数,并建立了用Lattice-Boltzmann方法(LBM)计算的物理模型。在此基础上,用D2Q9LBM模型计算泡沫多孔材料有效导热系数。通过模拟结果与实验结果对比,研究泡沫多孔材料的有效导热系数。研究结果表明模拟具有很高的精度;当体积分数从0.04增加到0.09时,有效导热系数随固相体积分数的增加而近似线性增加;当体积分数小于0.04且继续减小时,有效导热系数下降较快。
In order to improve the numerical accuracy of the effective thermal conductivity of foamed cellular materials, a computer software was used to process the electron microscope images of foamed cellular materials to calculate the volume fraction of foamed cellular materials. The physical model calculated by Lattice-Boltzmann method (LBM) . Based on this, the effective thermal conductivity of foam cellular material is calculated by D2Q9LBM model. By comparing the simulation results with the experimental results, the effective thermal conductivity of foamed porous materials is studied. The results show that the simulation has high precision. When the volume fraction increases from 0.04 to 0.09, the effective thermal conductivity increases approximately linearly with the volume fraction of the solid phase. When the volume fraction is less than 0.04 and continues to decrease, the effective thermal conductivity decreases more fast.