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Theoretical model of radiative transfer in opacified aerogel based on realistic microstructures

机译:基于真实微观结构的不透明气凝胶中辐射传递的理论模型

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摘要

Opacified silica aerogels are composite insulating materials containing silica nanoparticles and microsize opacifier grains. The radiative heat transfer in this dispersed medium was analyzed using a realistic microstructure model to calculate the opacified aerogel's optical properties. The aerogel matrices were simulated using aggregates generated by a DLA algorithm, where the particle sizes and numbers were determined from the basic physical parameters. The theoretical predictions of the aerogel's optical parameters agreed well with experimental data. A geometric unit containing one opacifier particle and a large number of aerogel particles was then built to study the coupled radiation effect between the aerogel and the opacifier. The optical parameters were computed using a multi-sphere T-matrix code with comparisons with Mie scattering solutions. The results show how the opacifier's modified optical properties reduce the aerogel's radiative conductivity.
机译:不透明的二氧化硅气凝胶是包含二氧化硅纳米颗粒和微尺寸遮光剂颗粒的复合绝缘材料。使用实际的微观结构模型分析了这种分散介质中的辐射传热,以计算不透明气凝胶的光学性能。使用DLA算法生成的聚集体模拟气凝胶基质,其中的粒径和数量是从基本物理参数确定的。气凝胶光学参数的理论预测与实验数据吻合良好。然后构建包含一个遮光剂颗粒和大量气凝胶颗粒的几何单元,以研究气凝胶和遮光剂之间的耦合辐射效应。使用多球面T矩阵代码并与Mie散射解决方案进行比较来计算光学参数。结果表明,遮光剂的改进光学性能如何降低气凝胶的辐射传导率。

著录项

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  • 作者单位

    Key Laboratory for Thermal Science and Power Engineering of MOE, Beijing Key Laboratory for CO_2 Utilization and Reduction Technology, Tsinghua University, Beijing 100084, China;

    Key Laboratory for Thermal Science and Power Engineering of MOE, Beijing Key Laboratory for CO_2 Utilization and Reduction Technology, Tsinghua University, Beijing 100084, China;

    Key Laboratory for Thermal Science and Power Engineering of MOE, Beijing Key Laboratory for CO_2 Utilization and Reduction Technology, 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;

  • 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; Opacifier; Radiative transfer; T-matrix; DLA;

    机译:气凝胶;遮光剂辐射传递;T-矩阵;DLA;

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