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首页> 外文期刊>International Journal of Heat and Mass Transfer >Thermal conductivity of highly porous mullite materials
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Thermal conductivity of highly porous mullite materials

机译：高度多孔莫来石材料的热导率

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摘要

The thermal conductivity of highly porous mullite materials (from 72 to 86 vol% porosity) has been measured by the transient plane source (TPS) technique at room temperature. These materials were fabricated by foaming and starch consolidation and showed similar microstructures with different porosities. From the point of view of heat conduction, these materials can be considered as a two-phase system, viz. a dense mullite skeleton and air, and their thermal conductivities describe heat transfer through these composite materials. Through comparing experimental data and predicted values derived from theoretical models, these materials can be classified as "internal porosity" materials and their thermal conductivities are bounded between the Maxwell-Eucken 1 model and the effective medium theory (EMT) equation. Then the porosity dependence of thermal conductivity was modeled by a simple model which assumes that components were contained in a uniform medium with thermal conductivity k_m.
机译：高度多孔莫来石材料的热导率（孔隙率为72至86 vol％）已通过室温下的瞬态平面源（TPS）技术进行了测量。这些材料是通过发泡和淀粉固结制成的，并显示出具有不同孔隙率的相似微观结构。从导热的观点来看，这些材料可以被认为是两相系统。致密的莫来石骨架和空气，它们的热导率描述了通过这些复合材料的热传递。通过比较实验数据和理论模型得出的预测值，可以将这些材料归类为“内部孔隙率”材料，并且其热导率限制在Maxwell-Eucken 1模型和有效介质理论（EMT）方程之间。然后，通过一个简单的模型对热导率的孔隙率依赖性进行建模，该模型假定组分包含在热导率为k_m的均匀介质中。

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  • 作者

    Lunlun Gong; Yonghong Wang; Xudong Cheng; Ruifang Zhang; Heping Zhang;

  • 作者单位

    State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, Anhui 230027, PR China;

    School of Materials Science and Engineering, Hefei University of Technology, Hefei, Anhui 230009, PR China;

    State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, Anhui 230027, PR China;

    State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, Anhui 230027, PR China;

    State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, Anhui 230027, PR 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

    Thermal conductivity; Porous materials; Mullite; Modeling;

    机译：导热系数;多孔材料莫来石造型;

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