deCastro C A N, Roder H M
National Bureau of Standards, Boulder, CO 80303.
J Res Natl Bur Stand (1977). 1981 May-Jun;86(3):293-307. doi: 10.6028/jres.086.011.
The thermal conductivity of argon at room temperature and for pressures up to 68 MPa has been measured with a transient hot-wire technique in order to assess the accuracy of an instrument of this type. The data are presented for a nominal temperature of 300.65 K and comparison with other authors shows that our data is accurate to within ± 1 percent, and it is the most accurate set of data for pressures above 35 MPa. Experimental evidence of a thermal conductivity enhancement near the critical density for a temperature about twice the critical temperature is herein reported. The experimental data were compared with the values predicted by the hard sphere model and it has been found that the theory gives values that are about 4 percent lower than the experimental ones in the density range 0-400 kg/m and about 1 to 2 percent lower in the high density region 400-825 kg/m.
为了评估此类仪器的准确性，采用瞬态热线技术测量了室温下氩气在高达68兆帕压力下的热导率。给出了名义温度为300.65 K时的数据，与其他作者的数据比较表明，我们的数据精确到±1%以内，并且是35兆帕以上压力下最精确的数据集。本文报道了在临界温度约两倍的温度下，临界密度附近热导率增强的实验证据。将实验数据与硬球模型预测的值进行了比较，发现在密度范围0 - 400千克/立方米内，该理论给出的值比实验值低约4%，在高密度区域400 - 825千克/立方米内低约1%至2%。
