文档介绍：纳米颗粒聚集结构模拟及导热系数研究
摘要采用连续算法,对纳米颗粒聚集结构的微观近似模型进行数字生成。根据Bruggeman模型对纳米颗粒聚集结构的传热特性进行分析和计算,并将计算所得聚集结构的有效导热系数引入MG模型,进一步对氧化铜纳米颗粒悬浮液的有效导热系数进行计算。采用以上方法及单元体传热模型,计算不同条件下二氧化硅气凝胶的有效导热系数,分析气凝胶导热系数随结构参数、温度和压强变化的一般规律。通过与实验测得数据的对比,验证了以上方法和计算过程的可行性及合理性。关键词聚集体分形理论气凝胶有效导热系数9008
毕业设计说明书(论文)外文摘要
Title Imitation of Nanoparticle Clusters and Research of Effective Thermal Conductivity
Abstract
The approximate microscopic model of nanoparticle clusters is numerically established by the Sequential Algorithm. The analysis and calculation of heat transfer in aggregated structure of nanoparticles is based on the Bruggeman Model. In order to calculate the effective thermal conductivity of nanoparticle suspension of CuO, the result obtained by the Bruggeman Model is used in the MG Model. The effective thermal conductivity of silica aerogel in different condition is calculated by the method above and unit cell model. And the result shows that the geometric parameters of aerogel, temperature and pressure have an influence on the effective thermal conductivity of silica aerogel. The method and process of calculation is proved to be feasible and reasonable paring the calculation with experimental data.
Keywordsaggregatefractal theoryaerogeleffective thermal conductivity
目次
由纳米级胶体粒子或高聚物分子构成的气凝胶,作为纳米材料的一种,因其纳米多孔及三维网络结构,具有密度小,孔隙率高(最高可达99%以上)等特点,/(m•K),是一种理想高效的隔热材料。然而气凝胶的力学性能较差,因此许