A new approach to the investigation of vdW type of equations of state (EOS) is developed by embedding a vapor pressure equation and a saturated liquid volume equation into vdW type EOS, which results in a new function...A new approach to the investigation of vdW type of equations of state (EOS) is developed by embedding a vapor pressure equation and a saturated liquid volume equation into vdW type EOS, which results in a new function AS(T). The AS(T) possesses the properties of an attractive parameter A(T), and if an EOS is accurate in the whole PVT space, then its numerical value equals A(T). As a useful tool for investigating EOS, the As(T) has been used to make comparisons among RKS, PRSVII, PT and ALS EOS, and to indicate where the shortcomings of the EOS are coming from. Based on the AS(T), a possible way to develop a real predictive equation of state is also suggested.展开更多
In this paper, a molecular aggregation function which represents the degree of molecular aggregation is derived based on statistical mechanic method. Then,a truncated vinal equation is modified by the molecular aggreg...In this paper, a molecular aggregation function which represents the degree of molecular aggregation is derived based on statistical mechanic method. Then,a truncated vinal equation is modified by the molecular aggregation theory. The proposed extended equation of state gives good representation of the PVT properties of saturated vapors for some strong polar fluids including water, alcohols and carboxylic acid etc.展开更多
文摘A new approach to the investigation of vdW type of equations of state (EOS) is developed by embedding a vapor pressure equation and a saturated liquid volume equation into vdW type EOS, which results in a new function AS(T). The AS(T) possesses the properties of an attractive parameter A(T), and if an EOS is accurate in the whole PVT space, then its numerical value equals A(T). As a useful tool for investigating EOS, the As(T) has been used to make comparisons among RKS, PRSVII, PT and ALS EOS, and to indicate where the shortcomings of the EOS are coming from. Based on the AS(T), a possible way to develop a real predictive equation of state is also suggested.
文摘In this paper, a molecular aggregation function which represents the degree of molecular aggregation is derived based on statistical mechanic method. Then,a truncated vinal equation is modified by the molecular aggregation theory. The proposed extended equation of state gives good representation of the PVT properties of saturated vapors for some strong polar fluids including water, alcohols and carboxylic acid etc.
