一个新的适用于近临界区域CO_(2)导热系数计算的关联式

A new correlation for the thermal conductivity of carbon dioxide in near-critical region

提出了一个新的CO_(2)导热系数关联式,该关联式适用于273.00~1273.00 K、0.07~210.00 MPa、1.0~1145.0 kg/m^(3)。与以往CO_(2)导热系数关联式相比,提出的关联式只需温度T和密度ρ两个已知参数,不仅在全域范围内提高了计算精度,而且解决了以往关联式在近临界区域计算精度变差的问题,便于工程应用。在整个温度压力的适用范围内,新关联式计算值与实验值的相对偏差绝对平均值为2.79%;在近临界区域内,相对偏差绝对平均值为4.94%。

A new correlation for calculating the thermal conductivity of carbon dioxide is presented.The applied thermodynamic region of this correlation is 273.00~1273.00 K,0.07~210.00 MPa and 1.0~1145.0kg/m^(3).Compared with the previous thermalconductivity correlations of carbon dioxide,the proposed correlation is convenient for engineering application that only two known parameters are required,temperature T and densityρ,which improves the computation alaccuracy in the whole region,especially for the near-criticalregion.The absolute average value of relative deviations between the calculated values and the literature data are 2.79%and 4.94%for the whole applied range and the near-criticalregion,respectively.