化工学报2026，Vol.77Issue(5)：2413-2423,11.DOI:10.11949/0438-1157.20251266
饱和气液相密度关联外推的新通用对比态方程
New universal corresponding state equation for correlation and extrapolation of saturated vapor-liquid density
摘要
Abstract
Saturated density,a key thermophysical property of fluids at vapor-liquid equilibrium,is widely used in power cycles and chemical processes.However,experimental data of saturated density are often scarce and scattered;consequently,developing a correlation equation that accurately reproduces existing measurements while providing reliable extrapolation is essential.In this work,based on the thermodynamic similarity between saturated density and saturated vapor pressure,the previously proposed three-parameter saturated vapor pressure equation is extended to saturated density.The functional form is preserved,ensuring positive density and correct limiting behavior toward the critical point and triple point.Using thirty-two substances that possess abundant experimental data,the new equation is compared with the Zhang equation and Wagner equation.The results demonstrate that,with respect to correlation,the deviations of the new equation are of the same magnitude as those of the Zhang equation and Wagner equation and lie within the reported experimental uncertainties.In terms of extrapolation,the new equation is superior to or equivalent to the Zhang equation and Wagner equation,exhibiting a more stable and accurate extrapolation trend.Further improvement in the stability and accuracy of the extrapolation trend can be achieved by fixing some parameters of the new equation during extrapolation fitting.关键词
热力学性质/气液平衡/模型/预测/饱和密度/Wagner型方程Key words
thermodynamics properties/vapor-liquid equilibrium/model/prediction/saturated density/Wagner equation分类
能源科技引用本文复制引用
卿康,汪尔奇,杨震,段远源..饱和气液相密度关联外推的新通用对比态方程[J].化工学报,2026,77(5):2413-2423,11.基金项目
国家重点研发计划项目(2023YFB4102201) （2023YFB4102201）
云南省西南联合研究生院科技专项基金项目(202302AO370018) （202302AO370018）
清华大学-山西清洁能源研究院创新种子基金项目 （）
