作者：付文强¹, 高辉², 薛征欣², 关卫军¹, 韩飞¹, 王兴东¹

作者单位：1. 陕西省计量科学研究院, 陕西 西安 710065;
2. 西安交通大学 热流科学与工程教育部重点实验室, 陕西 西安 710049

关键词：瞬态热线法;多孔材料;有效导热系数;多孔结构模型

摘要：

为研究多孔材料的传热机理,采用实验测量验证理论模型的方式,利用瞬态热线法测量283~333 K范围内多孔保温材料挤塑式聚苯乙烯(XPS)的有效导热系数,并根据多孔材料各组成部分导热系数、密度以及结构特点,使用5种基本模型包括串联模型、并联模型、Kopelman isotropic模型、Maxwell-Eucken模型以及EMT模型,分别对其有效导热系数进行计算。结果证明:对于XPS,Kopelman iostropic和Maxwell-Eucken模型更具适用性,其计算结果与实验结果最大偏差均小于0.5%,为进一步开展多孔材料的有效导热系数模型和实验研究提供理论依据。

Experimental measurement and calculation of thermal conductivity of porous material

FU Wenqiang¹, GAO Hui², XUE Zhengxin², GUAN Weijun¹, HAN Fei¹, WANG Xingdong¹

1. Shaanxi Institute of Metrology Science, Xi'an 710065, China;
2. MOE Key Laboratory of Thermo-Fluid Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China

Abstract: The effective thermal conductivity of porous insulation materials XPS was measured by transient hot-wire method at the temperature ranging from 283 K to 333K. In particular, the effective thermal conductivity of the XPS was calculated with 5 basic models, viz., Series, Parallel, Kopelman isotropic, Maxwell-Eucken and EMT, according to the thermal conductivity, density and structural characteristics of each component of the material. The experimental results and calculations show that Kopelman isotropic model and the Maxwell-Eucken model are more suitable for the calculation of effective thermal conductivity of porous materials. The bias between calculation and experimental results was less than 0.5%.

Keywords: transient hot-wire;porous insulation material;effective thermal conductivity;porous model

2016, 42(5): 124-130  收稿日期: 2015-11-26;收到修改稿日期: 2015-12-21

基金项目: 国家质检总局科技计划项目(20130K147)

作者简介: 付文强(1961-),男,安徽颍上县人,高级工程师,主要从事计量测试研究。

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