基于Lattice-Boltzmann方法的泡沫材料有效导热系数研究

Research on Effective Thermal Conductivity of Foam Material Based on Lattice-Boltzmann Method

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。

To improve the calculation accuracy of effective thermal conductivity of the foam material, a method using computer softwares to process electron micrographs of the foam material was presented to calculate the volume fraction of foam materials, and the physical model using Lattice-Boltzmann Method （LBM） was built. Basing on it, the D2Q9LBM model was used to calculate the effective thermal conductivity of the foam material. Comparing simulation results with experimental results, the effective thermal conductivity of the foam material was studied. The results show that the simulation has high accuracy. When the volume fraction increases from 0.04 to 0.09, the effective thermal conductivity increases approximately linearly; when the volume fraction is reduced to less than 0.04 and decreases continuously, the effective thermal conductivity decreases rapidly.