用变长度"T"形法测量单根纤维热导率

工程热物理学报 , 2009, 30(12): 2068-2070.

用变长度"T"形法测量单根纤维热导率

王建立 ^1, , 顾明 ^2, , 马维刚 ^3, , 张兴 ^4, , 宋燕 ^5,

1.热科学与动力工程教育部重点实验室,清华大学工程力学系,北京,100084

2.热科学与动力工程教育部重点实验室,清华大学工程力学系,北京,100084

3.热科学与动力工程教育部重点实验室,清华大学工程力学系,北京,100084

4.热科学与动力工程教育部重点实验室,清华大学工程力学系,北京,100084

5.中国科学院山西煤炭化学研究所,山西,太原,030001

基金项目: 国家自然科学基金(50676046;50730006)

关键词：接触热阻 , 变长度"T"形法 , 单根纤维 , 热导率

MEASUREMENT OF THERMAL CONDUCTIVITY OF AN INDIVIDUAL FIBER USING CHANGING LENGTH T-TYPE METHOD

WANG Jian-Li ^1, , GU Ming ^2, , MA Wei-Gang ^3, , ZHANG Xing ^4, , SONG Yan ^5,

1.热科学与动力工程教育部重点实验室,清华大学工程力学系,北京,100084

2.热科学与动力工程教育部重点实验室,清华大学工程力学系,北京,100084

3.热科学与动力工程教育部重点实验室,清华大学工程力学系,北京,100084

4.热科学与动力工程教育部重点实验室,清华大学工程力学系,北京,100084

5.中国科学院山西煤炭化学研究所,山西,太原,030001

Keywords： thermal contact resistance , changing length T-type method , individual fiber , thermal conductivity

为了解决"T"形法中的接触热阻问题,本文在不改变纤维与热线之间的接触节点的前提下,通过测量同一根纤维不同长度对应的表观热阻,同时得到了纤维热导率以及节点的接触热阻.用变长度"T"形法测量得到 Pt 丝以及两根沥青基碳纤维的热导率分别为 73,480 和 500 W m-1 K-1.

Based on a T-type probe, the thermal conductivity of an individual fiber and the thermal contact resistance of the junction between the fiber and the hot wire are simultaneously obtained,by measuring one fiber with different lengths when an identical junction is maintained. Using the changing length T-type method, the thermal conductivity of the Pt wire and two individual pitch-based carbon fibers are found to be 73, 480 and 500 W m-1 K-1, respectively.

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