Combined effects of pores and cracks on the effective thermal conductivity of materials: a numerical study

IF 3.4 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Yu-Lin Shen, Garrett Rose
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引用次数: 0

Abstract

Porous solids are commonplace in engineering structures and in nature. Material properties are inevitably affected by the internal inhomogeneity. The effective thermal conductivity of porous materials has been and remains to be a subject of extensive research. Less attention has been devoted to thermal conductivity impacted by internal cracks. This study is devoted to theoretical analyses of the combined effects of pores and cracks on the effective thermal conductivity. Systematic numerical simulations using the finite element method are performed based on two-dimensional models, with periodic distributions of internal pores and cracks. The parametric investigations seek to address how individual geometric layout can influence the overall thermal conduction behavior. In addition to circular pores and isolated cracks, angular pores with cracks extending from their sharp corners are also considered. It is found that both isolated cracks and cracks connected to existing pores can significantly reduce the effective thermal conductivity in porous materials. Since it is much easier to microscopically detect internal pores than thin cracks, care should be taken in using the apparent porosity from microscopic images and density measurements to estimate the overall thermal conductivity. Quantitative analyses of the detailed geometric effects are reported in this paper.

孔隙和裂缝对材料有效导热性的综合影响:数值研究
多孔固体在工程结构和自然界中都很常见。材料特性不可避免地受到内部不均匀性的影响。多孔材料的有效导热性一直是并将继续是广泛研究的主题。人们对内部裂缝影响的导热性关注较少。本研究致力于从理论上分析孔隙和裂缝对有效导热率的综合影响。在二维模型的基础上,采用有限元法对内部孔隙和裂缝的周期性分布进行了系统的数值模拟。参数研究旨在解决个别几何布局如何影响整体热传导行为的问题。除了圆形孔隙和孤立裂缝外,还考虑了从尖角处延伸出裂缝的角形孔隙。研究发现,孤立的裂缝和与现有孔隙相连的裂缝都能显著降低多孔材料的有效热传导率。由于在显微镜下检测内部孔隙比检测细小裂缝要容易得多,因此在使用显微图像和密度测定得出的表观孔隙率来估算整体导热率时应谨慎小心。本文报告了对详细几何效应的定量分析。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
8.60
自引率
0.00%
发文量
1
审稿时长
13 weeks
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