| 描述微纳米多孔复合绝热材料的单元体传热模型 |
| |
| 引用本文： | 魏高升,张欣欣,于帆.描述微纳米多孔复合绝热材料的单元体传热模型[J].北京科技大学学报,2008,30(7). |
| |
| 作者姓名： | 魏高升 张欣欣 于帆 |
| |
| 作者单位： | 1. 华北电力大学能源与动力工程学院,电站设备状态监测与控制教育部重点实验室,北京,102206
2. 北京科技大学机械工程学院,北京,100083 |
| |
| 基金项目： | 国家自然科学基金，华北电力大学校科研和教改项目 |
| |
| 摘 要： | 根据硬硅钙石-气凝胶复合绝热材料的微观结构特点,建立了描述材料内气固耦合导热的三维单元体传热模型.通过模型计算对硬硅钙石型硅酸钙、气凝胶及硬硅钙石-气凝胶复合绝热材料的导热系数进行了对比研究.结果表明:硬硅钙石型硅酸钙密度是影响复合绝热材料有效导热系数的关键因素,而气凝胶密度的影响不大;在高温下,复合绝热材料的导热系数要明显低于硬硅钙石型硅酸钙及二氧化硅气凝胶的导热系数.
|
| 关 键 词： | 有效导热系数 纳米孔绝热材料 硬硅钙石型 硅酸钙 气凝胶 多孔介质 |
Unit cell model for micro, nano-porous composite insulation material |
| |
| WEI Gaosheng,ZHANG Xinxin,YU Fan.Unit cell model for micro, nano-porous composite insulation material[J].Journal of University of Science and Technology Beijing,2008,30(7). |
| |
| Authors: | WEI Gaosheng ZHANG Xinxin YU Fan |
| |
| Abstract: | Based on the microstructure features of xonotlite-aerogel composite insulation material,a three dimensional unit cell model was developed for the coupled heat transfer of gas and solid in the material.The effective thermal conductivities of xonotlite-type calcium silicate,aerogel and xonotlite-aerogel composite insulation material were compared by model calculation.The results show that the density of xonotlite-type calcium silicate has great influence on the effective thermal conductivity of xonotlite-aerogel composite insulation material,but the density of aerogel has little influence.The effective thermal conductivity of xonotlite-aerogel composite insulation material is apparently lower than those of xonotlite-type calcium silicate and aerogel at an elevated temperature. |
| |
| Keywords: | effective thermal conductivity nano-porous insulator xonotlite-type calcium silicate aerogel porous media |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
|
