Generalized equation of state for vapors and liquids

Sugie, Hidezumi; Lu, Benjamin C.‐Y.

doi:10.1002/aic.690170510

Cited by 10 publications

(3 citation statements)

References 21 publications

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“…The group standard fractional deviation, up, is calculated using the following equation: Lee-Kesler (1975) 3-parameter corresponding states correlation 2 Lee-Erbar-Edmister (1973) eq. of state 3 Sugie-Lu (1970, 1971) eq. of state 4 Soave (1972) modification of the Redlich-Kwong eq.…”

Section: Sources Of Heat Capacity Databasementioning

confidence: 99%

Comparison of generalized equations of state to predict gas‐phase heat capacity

Garipis

Stamatoudis

1992

AIChE Journal

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Section: Sources Of Heat Capacity Databasementioning

confidence: 99%

Comparison of generalized equations of state to predict gas‐phase heat capacity

Garipis

Stamatoudis

1992

AIChE Journal

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“…The listing of the functions is available upon request. 2 The values used are from ref (17), (18). 3 The values used are from ref (19), (20).…”

Section: Principle Of Computationmentioning

confidence: 99%

Computer estimation of thermodynamic properties of real gases

Llinas¹,

Fréze²

1976

J. Chem. Educ.

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A large number of papers dealing with the computer estimation of thermodynamic properties of real fluids have appeared recently (1-5). Generally; the predicting methods which yield accurate results over a wide range of conditions are quite complex to use and need lengthy calculations on large core memory computers. They are often limited to the prediction of the departure functions. Our purpose was to provide the students and the research staff of our school with a simple and efficient means to evaluate some properties of real gases for computer calculations in applied thermodynamics and chemical engineering. We set up on a small computer, a package of FUNCTION subroutines written in Fortran IV, which were able to calculate separately specific volumes, heat capacities, enthalpy and entropy of a large number of compounds fur a given pressure and temperature. The characteristic ptoperties of these compounds, used in these functions, are stored in a permanent file on disc memory. Principle of ComputationThe method we used involved, first the estimation of the value of the thermodynamic function for the compound in the ideal gas state, and second, the associated isothermal function departure which was derived from a generalized equation of state.Several types of correlations have been used (6-9,24) to obtain analytical expressions for the ideal gas heat capacity ( C p o ) , (9) used a set of thermodynamically consistent equations ((1)-(3)), based on a polynomial development of the fifth degree for the enthalpy H " = A + B T + C T 2 + D T 3 + E T 4 + F T 5 (1) CPD = B + 2CT + 3 D P + 4ET3 + 5 F P (7) So = BlnT + 2CT + 312DP + 413 E F + 514 FT4 + G (3) (Ho = 0 kJ kg-' a t O°K, S o = 0 kJ kg-lK-' at ODK and 1 atm) These equations produce values which fit well with the values calculated by statistical mechanical procedures for 146 gases. Among the numerous generalized equations of state (10-17) which we have tested, we selected the three parameters model of Lee and Edmister (16): This equation (4) was initially intended for the calculation of fugacity coefficients and enthalpy departure of gases. This model gives a good representation of PVT data in a wide pressure and temperature range. I t is very simple to use and can readily he extended to gas mixtures. enthalpy (Ho), and entropy (So). Passut and Danner (8) and Huang and Dauhertwhere T, = critical temperature (OK), PC = critical 'pressure (atm), w = acentric factor, and R = gas constant (82.05606 em3 atm mole-' K-'1. To obtain the specific volume, the compressibility factor (Z = PVIRT) is computed fur each value of P and T by solving the cubic eqn. (14) derived from eqn. (4). In all cases the largest real root was retained.Z3 -ZZ -Z[P2b2/R2T2 + PbIRTo P / R 2 P ] + (abe ) P2/R3T3 = 0 (14)

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“…Some equations of state are obtained by fitting various functions to the experimental isotherms. An early example is Sugie and Lu (1971). This approach can successfully replicate the behavior of three-phase systems in specific ranges of thermodynamic space.…”

Section: Introductionmentioning

confidence: 99%

An equation of state for more than two phases, with an application to the Earth’s mantle

Robles-Dominguez

Robles-Gutiérrez

Lomnitz

2007

GeofInt

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Se deriva una ecuación general de estado para fluidos de cualquier número de fases. La ecuación contiene a las principales ecuaciones de estado experimentales como casos especiales. Las energías no-aditivas de 3,4,... partículas deben también de ser consideradas, además de las energías binarias aditivas. Para derivar la isoterma en la vecindad de un punto crítico, se encuentra que la ecuación de estado debe contener al menos tres parámetros, incluyendo la energía potencial no-aditiva de tres cuerpos. Mostramos como obtener el espectro de interacciones de una ecuación de estado para el manto terrestre.

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Generalized equation of state for vapors and liquids

Cited by 10 publications

References 21 publications

Comparison of generalized equations of state to predict gas‐phase heat capacity

Comparison of generalized equations of state to predict gas‐phase heat capacity

Computer estimation of thermodynamic properties of real gases

An equation of state for more than two phases, with an application to the Earth’s mantle

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