碳酸二甲酯液相热导率

Thermal conductivity of dimethyl carbonate in liquid phase

利用瞬态单热线法重新研制了一套可耐高压的热导率测量装置,热导率测量的不确定度为±2%。用推荐物质甲苯对该装置在286～350K的温度范围内进行了检验,得到的结果与甲苯热导率推荐值的绝对平均偏差为0.48%。用该装置对温度区间为290～390K、压力区间为0.1～30MPa的碳酸二甲酯(DMC)的热导率进行了实验研究,并将实验数据拟合成关于温度和压力的热导率方程,实验数据与拟合方程计算值的最大偏差为-1.97%,绝对平均偏差为0.86%。

A new apparatus using the transient single hot-wire method was developed to measure the thermal conductivity under high pressure. The experimental system was tested by measuring the thermal conductivity of toluene from 286 K to 350 K, with an absolute average deviation from the recommended values of 0.48%. Measurements were performed with liquid dimethyl carbonate over the temperature range from 290 K to 390 K and pressure range from 0.1 MPa to 30 MPa. The data of thermal conductivity were correlated as a function of temperature and pressure. The maximum deviation and the absolute average deviation between the experiment values and the calculated values were -1.97% and 0.86%, respectively.