Thermodynamic properties of unsaturated vapour and liquid states from a cubic equation of state: Supercritical and compressed liquid regions

Mak, P.C.N.; Lielmezs, J.

doi:10.1016/0040-6031(92)87045-c

Cited by 6 publications

(5 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In other articles by Lielmezs et al. (1983, 1986), − the normal boiling temperature was introduced as a variable to the alpha function. This modified alpha function reduced the predictive deviation in the vapor pressure and the liquid and vapor volumes for organic, inorganic, and quantum fluids in the saturated and supercritical regions.…”

Section: Development Of Polynomial Alpha Functionsmentioning

confidence: 99%

“…The last kind of alpha function is entirely different from the Soave 1972 function, such as that explored by Lielmezs et al in 1983 and 1986. − In this function, T , T b , and T c are chosen as variables, and the parameters are the empirical constants adjusted individually for each compound. A similar method was adopted by Hosseinifar et al (2016) to predict the vapor pressure of light hydrocarbons, heavy hydrocarbons, polar, and quantum fluids with the PR EoS.…”

Section: Development Of Polynomial Alpha Functionsmentioning

confidence: 99%

See 1 more Smart Citation

Research into the Polynomial Alpha Function for the Cubic Equation of State

Zhao

Sun

et al. 2018

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

Alpha functions usually aim at predicting the thermodynamic properties of specific compounds in a limited range of reduced temperatures. The differences between polynomial alpha functions are mainly the functional forms and the parameter correlations. In this work, the functional forms, the parameter correlations, and the scope of 64 polynomial alpha functions are reviewed. The inherent relationships between the polynomial alpha functions as well as developing trends are also discussed. These functions were modified by changing the coefficients, exponents, or variable terms. The parameter formulas were re-correlated with the acentric factors or the other natural parameters. In recent years, research into polynomial alpha functions has mainly focused on reservoir fluids, and the alpha functions have been modified by adding characteristic constants of pseudocomponents to the equations or the parameter correlations. The Soave-type function has significant research value and will influence the development of polynomial alpha functions in the coming years.

show abstract

Section: Development Of Polynomial Alpha Functionsmentioning

confidence: 99%

Section: Development Of Polynomial Alpha Functionsmentioning

confidence: 99%

Research into the Polynomial Alpha Function for the Cubic Equation of State

Zhao

Sun

et al. 2018

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…Those equations provided a foundation for the development of mathematical models of fluids working in a classic gas turbine system. Similar approach and modelling attempts can be found in the literature: [1][2][3][7][8][9][10]. However, these publications are only concerned with selective equations of state for real gas (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…The only attempts to determine analytical relations focus on one selected gas equation and concern individual selected thermodynamic parameters (e.g. only specific enthalpy or specific entropy) [8][9][10]. There are no publications which present universal analytical relations for real gas equations with respect to all thermodynamic parameters necessary for a complete description of working fluids (e.g.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Archives of Thermodynamics

Trawiński

2020

View full text Add to dashboard Cite

Identification of working fluids and development of their mathematical models should always precede construction of a proper model of the analysed thermodynamic system. This paper presents method of development of a mathematical model of working fluids in a gas turbine system and its implementation in Python programming environment. Among the thermodynamic parameters of the quantitative analysis of systems, the following were selected: specific volume, specific isobaric and isochoric heat capacity and their ratio, specific enthalpy and specific entropy. The development of the model began with implementation of dependencies describing the semi-ideal gas. The model was then extended to the real gas model using correction factors reflecting the impact of pressure. The real gas equations of state were chosen, namely due to Redlich-Kwong, Peng-Robinson, Soave-Redlich-Kwong, and Lee-Kesler. All the correction functions were derived analytically from the mentioned equations of real gas behaviour. The philosophy of construction of computational algorithms was presented and relevant calculation and numerical algorithms were discussed. Created software allowed to obtain results which were analysed and partially validated.

show abstract

A Review of the Alpha Functions of Cubic Equations of State for Different Research Systems

Zhao

Sun

et al. 2019

Int J Thermophys

View full text Add to dashboard Cite

Thermodynamic properties of unsaturated vapour and liquid states from a cubic equation of state: Supercritical and compressed liquid regions

Cited by 6 publications

References 9 publications

Research into the Polynomial Alpha Function for the Cubic Equation of State

Research into the Polynomial Alpha Function for the Cubic Equation of State

Archives of Thermodynamics

A Review of the Alpha Functions of Cubic Equations of State for Different Research Systems

Contact Info

Product

Resources

About