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 2 0匝直径为 0 .0 2 mm的漆包铜丝紧密封进外径为 0 .3 m m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 %
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%.
出处
《应用科学学报》
CAS
CSCD
2002年第1期6-9,共4页
Journal of Applied Sciences
基金
国家自然科学基金资助项目 ( 5 0 0 0 60 14 )
