摘要
本文首先对纳米尺度受限空间中分子自由程进行了修正,进而提出了受限空间中气体的"净热导率"模型,并使用DSMC结果验证了该模型。采用扩散集团凝聚(DLCA)方法构造了气凝胶三维物理模型。结合提出的气相"净热导率"模型,采用LBM方法对气凝胶中气相贡献热导率进行了数值求解。结果表明:数值预测结果与实验值吻合较好。
In this paper, the mean free path of gas confined in nanospace was modified. Based on the modified gas mean free path, a model for predicting the thermal conductivity of gas in nanospace was proposed and validated by DSMC results. With the proposed gaseous thermal conductivity model, the gas-contributed thermal conductivity of aerogel was studied with the method of LBM, in which the 3-D aerogel structure was reconstructed by the three-dimensional diffusion-limited cluster-cluster aggregation （DLCA） method. The results show that the numerical results are in good agreement with the available experimental data.
作者
朱传勇
李增耀
ZHU Chuan-Yong LI Zeng-Yao(MOE Key Laboratory of Thermo-F1uid Science and Engineering, Xi＇an Jiaotong University, Xi＇an 710049, China)
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2017年第8期1753-1757,共5页
Journal of Engineering Thermophysics
基金
国家自然科学基金项目(No.51276138)
关键词
气凝胶
气相贡献热导率
LBM
aerogel
gas-contributed thermal conductivity
LBM
