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应用科学学报 ›› 2002, Vol. 20 ›› Issue (1): 6-9.

• 论文 • 上一篇    下一篇

热针法测量材料导热系数研究

谢华清1, 王锦昌1, 程曙霞2, 刘岩1   

  1. 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
  • 收稿日期:2000-08-08 修回日期:2001-07-21 出版日期:2002-03-31 发布日期:2002-03-31
  • 作者简介:谢华清(1970-),男,福建古田人,助研.
  • 基金资助:
    国家自然科学基金资助项目(50006014)

A Fine Needle Probe for Determining the Thermal Conductivity of Penetrable Materials

XIE Hua-qing1, WANG Jin-chang1, CHENG Shu-xia2, LIU Yan1   

  1. 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
  • Received:2000-08-08 Revised:2001-07-21 Online:2002-03-31 Published:2002-03-31

PDF

196

被引次数

91

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%.

关键词: 热针, 导热系数

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%.

Key words: thermal conductivity, thermal probe

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