Phase Equilibrium of Asymmetric Systems by Predictive Equations of State Models

2002 ◽  
Vol 41 (5) ◽  
pp. 963-967 ◽  
Author(s):  
Hasan Orbey ◽  
Ceyhun Balcı ◽  
Güniz A Gürüz
Keyword(s):  
Phase Equilibrium ◽  
Equations Of State ◽  
Predictive Equations ◽  
State Models

scholarly journals QUARK–DIQUARK EQUATIONS OF STATE MODELS: THE ROLE OF INTERACTIONS

2003 ◽  
Vol 12 (03) ◽  
pp. 519-526 ◽  
Author(s):  
J. E. HORVATH ◽  
G. LUGONES ◽  
J. A. DE FREITAS PACHECO
Keyword(s):  
Equation Of State ◽  
Boundary Conditions ◽  
Neutron Stars ◽  
Hard Sphere ◽  
Degrees Of Freedom ◽  
Equations Of State ◽  
Compact Star ◽  
Star Models ◽  
State Models

Recent observational data suggests a high compacticity (the quotient M/R) of some "neutron" stars. Motivated by these works we revisit models based on quark–diquark degrees of freedom and address the question of whether that matter is stable against diquark disassembling and hadronization within the different models. We find that equations of state modeled as effective λϕ4 theories do not generally produce stable self-bound matter and are not suitable for constructing very compact star models, that is the matter would decay into neutron matter. We also discuss some insights obtained by including hard sphere terms in the equation of state to model repulsive interactions. We finally compare the resulting equations of state with previous models and emphasize the role of the boundary conditions at the surface of compact self-bound stars, features of a possible normal crust of the latter and related topics.

A generalized process for phase equilibrium calculation with cubic equations of state

1993 ◽  
Vol 14 (5) ◽  
pp. 1101-1108 ◽  
Author(s):  
J. L. Daridon ◽  
H. Saint-Guirons ◽  
B. La Courette ◽  
P. Xans ◽  
C. Leibovici
Keyword(s):  
Phase Equilibrium ◽  
Equations Of State ◽  
Equilibrium Calculation

scholarly journals Perturbation Theory and Phase Behavior Calculations Using Equation of State Models

2020 ◽  
Author(s):  
Vassilis Gaganis
Keyword(s):  
Perturbation Theory ◽  
Statistical Mechanics ◽  
Phase Behavior ◽  
Chemical Engineering ◽  
Equations Of State ◽  
Feed Composition ◽  
Fluid Properties ◽  
State Models ◽  
Equilibrium Phases

Equations of State (EoS) live at the heart of all thermodynamic calculations in chemical engineering applications as they allow for the determination of all related fluid properties such as vapor pressure, density, enthalpy, specific heat, and speed of sound, in an accurate and consistent way. Both macroscopic EoS models such as the classic cubic EoS models as well as models based on statistical mechanics and developed by means of perturbation theory are available. Under suitable pressure and temperature conditions, fluids of known composition may split in more than one phases, usually vapor and liquid while solids may also be present, each one exhibiting its own composition. Therefore, computational methods are utilized to calculate the number and the composition of the equilibrium phases at which a feed composition will potentially split so as to estimate their thermodynamic properties by means of the EoS. This chapter focuses on two of the most pronounced EoS models, the cubic ones and those based on statistical mechanics incorporating perturbation analysis. Subsequently, it describes the existing algorithms to solve phase behavior problems that rely on the classic rigorous thermodynamics context as well as modern trends that aim at accelerating computations.

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