一种新的蒸气压方程

提出了一种新的2参数蒸气压方程,并用12种饱和蒸气压实验数据比较完整的典型物质对新方程的外推性与W agner方程、项方程和吴方程进行了比较。结果表明:新方程在三相点方向的外推性具有明显的优势,总体平均偏差为1.05%,而W agner方程、项方程和吴方程的总体平均偏差分别为41.4%,5.20%和5.60%;在临界点方向的外推性略差于W agner方程,与项方程和吴方程相当。尝试仅用4个实验数据点拟合各方程,结果表明:新方程在三相点和临界点方向同时外推的精度明显优于其他方程。

A new type equation for vapor pressure

A new two-parameter equation for vapor pressure was presented.12 kinds of fluids were used to gain the saturated vapor pressure experimental data,which are much more sufficient to make a comparison of the extrapolation among the new equation,Wagner equation,Xiang equation and Wu equation,respectively.The results indicate that the new equation has the obvious advantage in the extrapolation behavior down to the triple point,and the overall average deviation is 1.05%.But the overall average deviations of Wagner equation,Xiang equation and Wu equation are 41.4%,5.20% and 5.60%,respectively.Whereas,the extrapolation in the critical point of the new equation is slightly worse than that of Wagner equation,but is quite similar to that of Xiang equation and Wu equation.Only 4 experimental data points were adopted,attempting to fit in with each equation.The result shows that when the extrapolating to the triple point and the critical point at the same time,the precision of the new equation is clearly superior to the three other equations.