Abstract A new instrument for determining the thermal conductivity as a function of temperature and pressure for liquids is described. The system is based on the transient hot wire technique. It is totally automatized: pressure and temperature are controlled and voltage drop through the wire is acquired using a digital system, which automatically performs all required actions. The instrument calibration can be made using only one reference liquid over the whole temperature and pressure ranges. Using rigorous metrological methodologies, it was found uncertainty in thermal conductivity to be around 4%. The thermal conductivity for methanol, ethanol, 1-propanol, heptane, octane, toluene, 1,3-dichloropropane, 1,2-dichloropropane, 1-nitropropane, propionitrile, propionic acid and 1-propylamine, was determined in the temperature and pressure ranges (283.15–313.15) K and (0.1–65) MPa. These data are compared with available literature values; good agreement was obtained for all liquids, which reveals the validity of the experimental procedure. Thermal conductivity data as well as their dependency against temperature and pressure are discussed in terms of the chemical nature of the studied compounds.

中文翻译：

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高压下有机液体的热导率测量

摘要 描述了一种用于确定作为液体温度和压力函数的热导率的新仪器。该系统基于瞬态热线技术。它是完全自动化的：压力和温度受到控制，通过电线的电压降是使用数字系统获取的，该系统会自动执行所有必需的操作。仪器校准可以在整个温度和压力范围内仅使用一种参考液体进行。使用严格的计量方法，发现热导率的不确定性约为 4%。甲醇、乙醇、1-丙醇、庚烷、辛烷、甲苯、1,3-二氯丙烷、1,2-二氯丙烷、1-硝基丙烷、丙腈、丙酸和1-丙胺的热导率是在温度和压力下确定的范围 (283. 15–313.15) K 和 (0.1–65) MPa。将这些数据与现有文献值进行比较；所有液体都获得了良好的一致性，这表明了实验程序的有效性。根据所研究化合物的化学性质讨论了热导率数据及其对温度和压力的依赖性。