摘要
研制了高精度瞬态双热线法导热系数测量装置及数据采集系统,整个测量系统的不确定度小于±1%.用液相甲苯标定213～363 K温度区间的饱和液相导热系数,并与标准值进行了比较,测量的平均偏差为0.37%,最大偏差为0.73%.用此装置对245～385 K温度区间的二甲醚饱和液相导热系数进行了实验研究,利用测量得到的饱和液相导热系数数据,拟合了二甲醚饱和液相的导热系数方程,该方程的计算值与实验数据的平均偏差为0.32%,最大偏差为0.85%,为二甲醚作为替代制冷剂和替代燃料等研究提供了急需的热物性数据.
A new apparatus based on the transient two hot-wires method and data acquisition system was constructed for absolute measurements of the thermal conductivity of liquids and gases and of pure fluids and mixtures. The apparatus could operate at temperature of 200-470K and pressure up to 30 MPa. The uncertainty was estimated to be within ±1%. Measurements were performed with saturated liquid toluene at 213-363 K. The absolute mean deviation in thermal conductivity was less than 0.37 % and maximum deviation was less than 0.73% compared with the reference data. Measurements were also performed with liquid dimethyl ether near the saturation line at 240-380K. The results of thermal conductivity were correlated as a polynomial function of the temperature. The average deviation of the computing results from the experimental data was less than 0.32%, and maximum deviation was less than 0.85%.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2005年第9期1026-1029,1034,共5页
Journal of Xi'an Jiaotong University
基金
国家重点基础研究发展规划资助项目(2001CB209208)
国家自然科学基金重点资助项目(50336020
50323001).
关键词
导热系数
瞬态双热线法
二甲醚
thermal conductivity
transient two hot-wires method
dimethyl ether
