A Helmholtz energy equation of state for calculating the thermodynamic properties of fluid mixtures

1999 ◽  
Vol 165 (1) ◽  
pp. 1-21 ◽  
Author(s):  
Eric W. Lemmon ◽  
Reiner Tillner-Roth
Keyword(s):  
Equation Of State ◽  
Thermodynamic Properties ◽  
Energy Equation ◽  
Helmholtz Energy ◽  
Fluid Mixtures ◽  
Helmholtz Energy Equation

A Helmholtz Energy Equation of State for Sulfur Dioxide

2016 ◽  
Vol 61 (8) ◽  
pp. 2859-2872 ◽  
Author(s):  
Kehui Gao ◽  
Jiangtao Wu ◽  
Penggang Zhang ◽  
Eric W. Lemmon
Keyword(s):  
Equation Of State ◽  
Sulfur Dioxide ◽  
Energy Equation ◽  
Helmholtz Energy ◽  
Helmholtz Energy Equation

PHASE ENVELOPE CONSTRUCTION FOR MIXTURES USING HIGHLY ACCURATE HELMHOLTZ ENERGY EQUATION OF STATE

2020 ◽  
Vol 6 (4) ◽  
pp. 8-27
Author(s):  
Taiming Luo ◽  
Alexei Yu. Chirkov
Keyword(s):  
Equation Of State ◽  
Energy Equation ◽  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Low Pressure ◽  
Helmholtz Energy ◽  
Gas Industry ◽  
Helmholtz Energy Equation ◽  
Robinson Equation ◽  
Phase Envelope

Phase envelope construction for mixtures is very important in the oil and gas industry. The most widely used model for phase envelope construction is Peng — Robinson equation of state (PR-EOS) due to its simplicity. In order to construct phase envelopes of natural gas, a highly accurate Helmholtz energy equation of state GERG-2008 was proposed. In this work, the accuracy of phase envelopes calculated by a highly accurate equation of state GERG-2008, simplified GERG-2008 and traditional cubic PR-EOS was analyzed. The pressure-based algorithm is used to calculate phase envelopes. Phase envelopes of the methane—ethane mixtures were constructed and compared with reference data. The results show that phase envelopes can be constructed with GERG-2008 in high accuracy. PR-EOS has good accuracy in phase envelope construction under low pressure. The simplified GERG-2008 also works well under low pressure; however, as pressure increases, it performs worse than the simpler PR-EOS, especially in the vicinity of critical point. Besides, a modified density solver for the complicated GERG-EOS was proposed. Calculations show that the proposed density solver can provide reliable results.

Fluid Mixtures of 6:12 Molecules in the Percus–Yevick Theory Using the Energy Equation

1971 ◽  
Vol 49 (12) ◽  
pp. 1593-1596 ◽  
Author(s):  
E. W. Grundke ◽  
D. Henderson ◽  
R. D. Murphy
Keyword(s):  
Thermodynamic Properties ◽  
Energy Equation ◽  
Simulation Studies ◽  
Fluid Mixture ◽  
Fluid Mixtures

The thermodynamic properties of a fluid mixture are calculated using the 6:12 potential together with the energy equation and the Percus–Yevick theory. The agreement with the results of simulation studies is good.

scholarly journals Calculation of thermodynamic properties of mixtures in two-phase equilibrium

2021 ◽  
Vol 2039 (1) ◽  
pp. 012016
Author(s):  
Taiming Luo ◽  
A Yu Chirkov
Keyword(s):  
Free Energy ◽  
Phase Equilibrium ◽  
Equation Of State ◽  
Thermodynamic Properties ◽  
Energy Equation ◽  
Helmholtz Free Energy ◽  
High Accuracy ◽  
Liquid Equilibrium ◽  
Two Phase ◽  
Vapor Liquid Equilibrium

Abstract Thermodynamic properties of mixtures in vapor-liquid equilibrium (VLE) were studied. Thermodynamic properties of the methane-ethane mixtures in VLE were calculated with highly accurate Helmholtz free energy equation of state GERG-2008, simplified GERG-2008 and common cubic PR equation of state (EOS). Results show that GERG-2008 has high accuracy in VLE calculations. However, simplified GERG-2008 and PR-EOS both work unsatisfactorily in VLE calculations.

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