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在分形理论的基础上,确定了基于石墨烯气凝胶(graphene aerogel,GA)骨架复合相变材料的分形维数,并基于改进的Sierpinski地毯建立了带有空穴的导热系数预测模型。预测结果表明,对于基于GA骨架的复合相变材料,在所制得的材料孔隙率为0.7的条件下,无论空穴尺寸如何,均可将导热系数从相变材料本身的0.250 W/(m·K)提升至10.900 W/(m·K),增长幅度达40倍以上。结果显示,复合相变材料的导热系数随着孔隙率的减小而增加,且在低孔隙率下,导热系数随空穴尺寸的减小而增加。
Based on the fractal theory, the fractal dimension based on graphene aerogel (GA) matrix composite phase change material was determined, and the prediction model of thermal conductivity with holes was established based on the improved Sierpinski carpet. The results show that for the composite phase change material based on the framework of GA, the thermal conductivity can be reduced from 0.250 W / (m) of the phase change material itself, regardless of the hole size, under the condition that the porosity of the material is 0.7. · K) to 10.900 W / (m · K), an increase of more than 40 times. The results show that the thermal conductivity of the composite phase change material increases with the decrease of porosity, and at low porosity, the thermal conductivity increases with decreasing hole size.