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Study of Microstructure-Based Effective Thermal Conductivity of Graphite Foam

机译：基于微观结构的石墨泡沫有效导热系数的研究

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摘要

As a relatively new type of functional material, porous graphite foam exhibits unique thermophysical properties. It possesses the advantages of low density, high specific surface area, and high bulk thermal conductivity and could be used as the core component of compact, lightweight, and efficient heat exchangers. Effective thermal conductivity serves one of the key thermophysical properties of foam-based heat exchangers. The complex three-dimensional topology and interstitial fluids significantly affect the heat conduction in the porous structure, reflecting a topologically based effective thermal conductivity. This paper presents a novel geometric model for representing the micro-structure of graphite foams with simplifications and modifications made on the realistic pore structure, where the complex surfaces and tortuous ligaments were converted into a simplified geometry with cylindrical ligaments connected between cuboid nodes. The multiple-layer method was used to divide the proposed geometry into solvable areas, and the series-parallel relation was used to derive the analytical model for the effective thermal conductivity. To explore heat conduction mechanisms at the pore scale, direct numerical simulation was also conducted on the realistic geometric model. Achieving good agreement with experimental data, the simplified geometric model was validated. The numerically simulated conductivity followed the simplified model prediction that the two geometries are equivalent from thermal aspect. It validates further that the simplified model is capable of reflecting the internal microstructure of graphite foam, which would benefit the understandings of the thermophysical mechanisms of pore-scaled heat conduction and microstructures of graphite foam.
机译：作为一种相对新型的功能材料，多孔石墨泡沫具有独特的热物理性质。它具有低密度，高比表面积和高导热系数的优点，可以用作紧凑，轻巧和高效的热交换器的核心组件。有效的热导率是基于泡沫的热交换器的关键热物理性质之一。复杂的三维拓扑和间隙流体会显着影响多孔结构中的热传导，从而反映出基于拓扑的有效热导率。本文提出了一种新颖的几何模型，用于表示石墨泡沫的微观结构，并对实际的孔结构进行了简化和修改，将复杂的表面和曲折的韧带转换为简化的几何形状，并在长方体节点之间连接了圆柱状的韧带。采用多层方法将所提出的几何形状划分为可求解区域，并使用串-平行关系得出有效导热系数的分析模型。为了探索孔隙尺度下的热传导机理，还对真实的几何模型进行了直接数值模拟。与实验数据取得良好的一致性，简化几何模型进行了验证。数值模拟的电导率遵循简化的模型预测，即从热方面看，这两个几何形状是等效的。它进一步证明简化模型能够反映石墨泡沫的内部微观结构，这将有助于理解孔尺度热传导的热物理机理和石墨泡沫的微观结构。

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  • 来源
    《Journal of Heat Transfer》 |2017年第5期|052004.1-052004.9|共9页
  • 作者

    L.W.Jin; Y.Chai; X.H.Yang; M.Zhao; Z.Y.Chen; X.Z.Meng; Q.L.Zhang; W.J.Hu;

  • 作者单位

    School of Human Settlement and Civil Engineering, Xi'an Jiaotong University, Xi'an 710049, China;

    School of Human Settlement and Civil Engineering, Xi'an Jiaotong University, Xi'an 710049, China;

    School of Human Settlement and Civil Engineering, Xi'an Jiaotong University, Xi'an 710049, China;

    School of Human Settlement and Civil Engineering, Xi'an Jiaotong University, Xi'an 710049, China China Northwest Architecture Design and Research Institute Co. Ltd., Xi'an 710018, China;

    School of Human Settlement and Civil Engineering, Xi'an Jiaotong University, Xi'an 710049, China;

    School of Human Settlement and Civil Engineering, Xi'an Jiaotong University, Xi'an 710049, China;

    School of Environment and Energy Engineering,Beijing University of Civil Engineering and Architecture, Beijing 100044, China;

    School of Environment and Energy Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, 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

    graphite foam; proposed model; effective thermal conductivity; numerical simulation;

    机译：石墨泡沫;拟模型;有效导热系数;数值模拟;

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