稠密流体导热系数和粘度计算的新方程

根据热力学面上流体无量纲化剩余迁移性质曲线与对比密度曲线的相似性,通过关联无量纲化剩余导热系数和粘度与对比密度的方程,提出了一个推算卤代烃制冷工质稠密流体迁移性质状态方程。在常压下迁移性质计算的基础上,应用该方程只要已知物质的临界参数、分子量和偏心因子便可以计算稠密流体（气相或液相）的导热系数和粘度。该方法的提出使得迁移性质的计算像平衡性质一样通过状态方程便可以求出。与实验数据比较,本方法计算导热系数的总平均偏差为 4.8％,最大偏差为18.0％;计算粘度的总平均偏差为4.4％,最大偏差为 15.6％。

NEW CORRELATION FOR ESTIMATING THERMAL CONDUCTI-VITY AND VISCOSITY OF DENSE FLUID

According to the phenomenological similarity between the reduced residual transport properties and the reduced density in terms of pressure and temperature over the entire thermodynamic surface, a new transport equation of state to estimate the thermal conductivity and the viscosity of the dense fluid for halogenated hydrocarbon refrigerants was put forward while the relationships between the reduced residual transport properties and the reduced density were determined. The new equation can calculate the thermal conductivity and the viscosity of the dense fluid including the vapor and liquid region with high accuracy, based on the calculation of the transport properties of gases at constant pressure, and only need the critical parameters, molecular weight and acentric factor as inputs. Using this method, the transport properties can be calculated with equation of state similar to the equilibrium properties. Compared with the experimental data, the absolute average deviation of the thermal conductivity of halogenated hydrocarbon refrigerants is 4.8% while its maximum is up to 18.0% , and the absolute average deviation of the viscosity of halogenated hydrocarbon refrigerants is 4.4% while its maximum is up to 15.6%.