基于格子Boltzmann方法的纤维增强气凝胶复合材料等效热导率求解  

Predictions of the Effective Thermal Conductivity for Aerogel-Fiber Composite Insulation Materials Using Lattice Boltzmann Method

作　　者：何超[1] 何雅玲[1] 谢涛[1] 刘清[1] 

机构地区：[1]西安交通大学能源与动力工程学院热流科学与工程教育部重点实验室,陕西西安710049

出　　处：《工程热物理学报》2013年第4期742-745,共4页Journal of Engineering Thermophysics

基　　金：国家重点基础研究发展计划(973计划)资助项目(No.2013CB228304);国家科技支撑计划课题(No.2012BAJ02B03)

摘　　要：对于纤维增强SiO2气凝胶复合隔热材料的等效热导率,以往主要通过提出简化结构之后利用等效电路方法进行理论求解。本文提出一种纤维结构的计算机随机生成方法,生成了不同的纤维气凝胶复合材料等效结构单元;采用三维格子Boltzmann模型求解该等效结构的温度场,并计算了复合材料常温下的等效热导率。本文数值预测结果与理论计算结果及相关实验结果吻合良好,表明本文模型能够有效地预测纤维-气凝胶复合材料的等效热导率。Effective thermal conductivity of aerogel-fiber composite insulation materials were often investigated with simplified models using equivalent circuit method in previous studies. In this paper a random generation method for fibers structure is proposed and different fiber-aerogel structures are reproduced. Then a 3-D lattice Boltzmann method is proposed to computed the effective thermal conductivity of the composite insulation material. The present results agree well with the theoretical results and experimental results. It indicates that the present model can predict well the effective thermal conductivity of fiber-aerogel composite insulation materials.

关 键 词：SIO2气凝胶 复合隔热材料 结构生成 格子BOLTZMANN方法 等效热导率 

分 类 号：TK124[动力工程及工程热物理—工程热物理]