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Thermal Properties of Silica Aerogel Formula

机译：二氧化硅气凝胶配方的热学性质

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摘要

The thermal conductivity of silica aerogel developed in this research program was measured using the transient hot-wire technique. The thermal conductivity of monolithic samples drops significantly from 9.3 mW/m · K to 3.2 mW/m · K with modest pressure reduction from 1 atm to 0.1 atm. The same aerogel in granular form has a thermal conductivity of 15.0 mW/m • K at ambient gas pressure with a modest compression applied to compact the granules and reduce the air void sizes. Radiation heat transfer in the hotwire test may not be representative of its contribution in large scale applications. Measurements of the monochromatic extinction coefficient over the wavelengths of interest resulted in a Rosseland mean extinction coefficient of 2400 m~(-1) at 300 K. The small thermal penetration distance during the hot-wire measurements suggest that in actual use radiation could contribute approximately 2.5 mW/m · K with a possible upper limit of 3.0 mW/m · K to the effective thermal conductivity over that measured using the transient hot-wire method.
机译：使用瞬态热线技术测量了该研究计划中开发的二氧化硅气凝胶的热导率。整体样品的热导率从9.3 mW / m·K显着下降到3.2 mW / m·K，压力从1 atm适度降低到0.1 atm。相同的颗粒状气凝胶在环境气压下的热导率为15.0 mW / m•K，并进行适度的压缩以压实颗粒并减小气孔尺寸。热线测试中的辐射传热可能无法代表其在大规模应用中的贡献。在目标波长上测量单色消光系数会导致在300 K时的Rosseland平均消光系数为2400 m〜（-1）。在热线测量过程中，较小的热穿透距离表明，在实际使用中，辐射可能会造成大约2.5 mW / m·K，相对于使用瞬态热线法测量的有效导热系数，可能的上限为3.0 mW / m·K。

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  • 来源
    《Journal of Heat Transfer》 |2015年第8期|081601.1-081601.8|共8页
  • 作者

    Ellann Cohen; Leon Glicksman;

  • 作者单位

    Building Technology Program, Department of Architecture and Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139;

    Building Technology Program, Department of Architecture and Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139;

  • 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

    aerogel; thermal conductivity; radiation; hot-wire measurement;

    机译：气凝胶导热系数;辐射;热线测量;

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