| 热针法测量材料导热系数研究 |
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| 引用本文： | 谢华清,王锦昌,程曙霞,刘岩.热针法测量材料导热系数研究[J].应用科学学报,2002,20(1):6-9. |
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| 作者姓名： | 谢华清 王锦昌 程曙霞 刘岩 |
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| 作者单位： | 1. 中国科学院上海硅酸盐研究所, 上海 200050;2. 中国科技大学热能工程系, 安徽合肥 230026 |
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| 基金项目： | 国家自然科学基金资助项目 ( 5 0 0 0 60 14 ) |
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| 摘 要： | 研究了可测量软性材料导热系数的热探针法,所用热探针由20匝直径为0.02mm的漆包铜丝紧密封进外径为0.3mm的不锈钢针管制成,铜丝同时起加热和测温元件作用.理论和实验研究表明,采用适当延迟测量时间可以克服因热针壁厚引起的误差.测量误差估计小于±3%.
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| 关 键 词： | 热针 导热系数 |
| 文章编号： | 0255-8297(2002)01-0006-04 |
| 收稿时间： | 2000-08-08 |
| 修稿时间： | 2000年8月8日 |
A Fine Needle Probe for Determining the Thermal Conductivity of Penetrable Materials |
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| XIE Hua qing ,WANG Jin chang ,CHENG Shu xia ,LIU Yan.A Fine Needle Probe for Determining the Thermal Conductivity of Penetrable Materials[J].Journal of Applied Sciences,2002,20(1):6-9. |
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| Authors: | XIE Hua qing WANG Jin chang CHENG Shu xia LIU Yan |
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| Institution: | 1. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;2. Department of Thermal Science and Energy Engineering, University of Science and Technology of China, Hefei 230026, China |
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| Abstract: | A fine needle probe for determining the thermal conductivity of penetrable materials such as fluids, fruit, animal fresh has been developed. The present probe is constructed by inserting twenty strands of copper wire with electrical insulation coating into a fine stainless steel needle. The copper wire serves both as a heating unit and as an electrical resistance thermometer. The effects on the thermal conductivity measurement caused by the thin needle wall has been analyzed. It is found that the effects can be negligibly small if the instruments and the measurement procedure is adequately designed. The usability of the as-constructed apparatus for the penetrable materials has been tested to measure the thermal conductivity of liquid, fruit and animal fresh. The accuracy of the measurement was estimated to be ±3%. |
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| Keywords: | thermal probe thermal conductivity |
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