Measurement and Correlation of the Thermal Conductivity of Propane from 86 K to 600 K at Pressures to 70 MPa

New experimental data on the thermal conductivity of propane are reported that allow improved
correlations to be developed. Previous correlations have been limited by a lack of thermal-conductivity
data for the vapor at temperatures below 300 K and liquid data near the critical point. In addition,
significant discrepancies were noted in the high-temperature dilute-gas thermal conductivity. The present
data cover the temperature range from the triple point at 85.5 K to 600 K and the pressure range 0.1 to
70 MPa. They are estimated to have an uncertainty of 1% for measurements removed from the critical
point and at pressures above 1 MPa, which increases to 3% in the critical region and 4% at low pressures
(<1 MPa). These new experimental data are used together with the previously available data to develop
improved correlations for the thermal conductivity of propane. The thermal-conductivity correlation for
propane is estimated to have an uncertainty of about 3% at a 95% confidence level, with the exception of
state points near the critical point and the dilute gas, where the uncertainty of the correlation increases
to 5%.

本文报道了丙烷热导率的全新实验数据，可为构建精度更优的关联模型提供支撑。此前的热导率关联模型受限于两方面数据缺失：一是300 K以下气相丙烷的热导率数据匮乏，二是临界点附近的液相丙烷热导率数据不足。此外，高温稀相气体的热导率数据曾存在显著偏差。本次实验获取的数据覆盖温度范围为85.5 K（三相点）至600 K，压力范围为0.1 MPa至70 MPa。据估算，远离临界点且压力高于1 MPa的测量点，其不确定度为1%；在临界区域内不确定度升至3%，低压区域（<1 MPa）则为4%。本研究将这批全新实验数据与已公开的历史数据相结合，构建了精度更优的丙烷热导率关联模型。经评估，该丙烷热导率关联模型在95%置信水平下的不确定度约为3%，临界点附近与稀相气体的工况点除外——此类工况下关联模型的不确定度升至5%。