• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>International Journal of Heat and Mass Transfer >Radiative properties and heat transfer characteristics of fiber-loaded silica aerogel composites for thermal insulation
【24h】

Radiative properties and heat transfer characteristics of fiber-loaded silica aerogel composites for thermal insulation

机译：纤维负载的二氧化硅气凝胶复合材料的散热性能和传热特性

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The radiative properties and heat transfer in fiber-loaded silica aerogel composites were investigated using modified anomalous diffraction theory in a combined heat conduction and radiation model. The randomly parameterized 2-D fiber distribution was generated to simulate a very realistic material structure. The finite volume method was then used to solve a two flux radiation model and the steady-state energy equation to calculate the effective thermal conductivity of the composite. The numerical results provide theoretic guidelines for material designs with optimum parameters, such as the inclination angle, diameter and length-to-diameter ratio of the fibers. The results show that the fiber extinction coefficient increases as the fiber length-to-diameter ratio is reduced or the fiber inclination angle is increased. The effective thermal conductivity of the fiber-loaded aerogel can be reduced by reducing the fiber length-to-diameter ratio and the inclination angle and by moderately increasing the fiber volume fraction. The 4-6 μm diameter silicon fibers are optimum for high-temperature thermal insulation.
机译：结合改进的反常衍射理论，在热传导与辐射相结合的模型中研究了纤维负载二氧化硅气凝胶复合材料的辐射性能和热传递。生成了随机参数化的二维纤维分布，以模拟非常逼真的材料结构。然后使用有限体积法求解两通量辐射模型和稳态能量方程，以计算复合材料的有效导热系数。数值结果为具有最佳参数的材料设计提供了理论指导，例如纤维的倾角，直径和长径比。结果表明，纤维消光系数随着纤维长径比的减小或纤维倾斜角的增加而增加。可以通过减小纤维的长径比和倾斜角以及适度增加纤维的体积分数来降低纤维负载气凝胶的有效导热率。直径4-6μm的硅纤维是高温隔热的最佳选择。

著录项

  • 来源
    《International Journal of Heat and Mass Transfer》 |2012年第20期|p.5196-5204|共9页
  • 作者

    Jun-Jie Zhao; Yuan-Yuan Duan; Xiao-Dong Wang; Bu-Xuan Wang;

  • 作者单位

    Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Tsinghua University, Beijing 100084, China;

    Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Tsinghua University, Beijing 100084, China;

    State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China, Beijing Key Laboratory of Multiphase Flow and Heat Transfer for Low Grade Energy, North China Electric Power University, Beijing 102206, China;

    Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Tsinghua University, Beijing 100084, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    fibrous insulation; silica aerogel; effective thermal conductivity; radiation; extinction coefficient; two flux method;

    机译：纤维绝缘二氧化硅气凝胶有效导热系数;辐射;消光系数二通量法;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号