多孔介质有效导热系数的实验与模拟

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多孔介质有效导热系数的实验与模拟

材料科学与工程 | 更新时间：2023-11-14

- 多孔介质有效导热系数的实验与模拟
- Experiment and Numerical Simulation of Effective Thermal Conductivity of Porous Media
- 工程科学与技术 2011年43卷第3期页码：198-203
- 作者机构：
- 作者简介：
- 基金信息：
  
  国家自然科学基金资助项目(50676016;50906007)
- DOI：
  中图分类号：
- 纸质出版日期：2011，
  
  网络出版日期：2010-6-17，
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史玉凤,刘红,孙文策.多孔介质有效导热系数的实验与模拟[J].工程科学与技术,2011,43(3):198-203.

Experiment and Numerical Simulation of Effective Thermal Conductivity of Porous Media[J]. Advanced Engineering Sciences, 2011,43(3):198-203.
史玉凤,刘红,孙文策.多孔介质有效导热系数的实验与模拟[J].工程科学与技术,2011,43(3):198-203. DOI：

Experiment and Numerical Simulation of Effective Thermal Conductivity of Porous Media[J]. Advanced Engineering Sciences, 2011,43(3):198-203. DOI：

摘要

中文摘要: 应用实验与数值模拟相结合的方法研究了多孔介质的有效导热系数。将分形理论与孔道网络模型相结合的分形孔道网络模型用于研究多孔介质的有效导热系数，为太阳池储热、地源热泵传热、食品干燥等方面打下了基础。模拟计算结果与实验结果吻合较好，证明了分形孔道网络模型适用于计算多孔介质的有效导热系数。研究了孔喉比、配位数、垂直热流方向喉道比例、喉道长度、孔隙率、固体骨架导热系数(Ks)及流体导热系数(Kf)等多方面对多孔介质有效导热系数的影响。结果表明

垂直热流方向喉道会增大多孔介质的热阻，降低多孔介质的有效导热系数。当Ks大于Kf时，随着孔喉比的增大以及喉道长度的减小，多孔介质的有效导热系数越大。当平行热流方向喉道数目相等时，多孔介质的有效导热系数随着配位数的减小而增大；当垂直热流方向喉道数目相等时，多孔介质的有效导热系数随着配位数的增大而增大。

Abstract

Abstract:Effective thermal conductivity of porous media was investigated by experimental and numerical approaches. Fractal pore network model

which was the combination of fractal theory and pore network model

was used to research the effective thermal conductivity of porous media. The numerical results agreed well with experimental ones

which indicated that the fractal pore network model is suitable for researching effective thermal conductivity of porous media. The effects of pore-throat ratio

coordination number

vertical throat proportion

throat length

porosity

thermal conductivity of matrix and fluid on the effective thermal conductivity of porous media were studied. It was revealed that vertical throat proportion can enlarge the thermo-resistance of porous media and decrease its effective thermal conductivity. If thermal conductivity of matrix is larger than that of fluid

the effective thermal conductivity of porous media increases with the increase of pore-throat ratio and decrease of throat length. When the number of parallel throat is fixed

the effective thermal conductivity of porous media increases with the decrease of coordination number. On the contrary

when the number of vertical throat is fixed

the effective thermal conductivity of porous media increases with the increase of coordination number.

关键词

多孔介质有效导热系数分形孔道网络模型

Keywords

porous mediaeffective thermal conductivityfractal pore network model

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