Thermal Expansivity of Near- and Supercritical Fluids: Equation-of-State Models and Calculations for Carbon Dioxide and C1 to C4 Normal Alkanes

2019 ◽  
Vol 64 (5) ◽  
pp. 2126-2133
Author(s):  
Alexandra L. Ramos Figueroa ◽  
Rolando A. Carreño-Chávez ◽  
L. Antonio Estévez
Keyword(s):  
Carbon Dioxide ◽  
Equation Of State ◽  
Supercritical Fluids ◽  
Thermal Expansivity ◽  
Normal Alkanes ◽  
State Models

A Novel Numerical Approach for Low Mach Number: Application to Supercritical Fluids

2013 ◽  
Author(s):  
Jalil Ouazzani ◽  
Yves Garrabos
Keyword(s):  
Carbon Dioxide ◽  
Equation Of State ◽  
Supercritical Fluid ◽  
Supercritical Fluids ◽  
Energy Equation ◽  
Fluid Flows ◽  
Ideal Gas ◽  
Gas Flows ◽  
Low Mach Number ◽  
Critical Carbon Dioxide

A new numerical algorithm has been developed to compute low Mach number fluids using the cV-formulation of the energy equation. cV is the specific heat at constant volume. It has been applied to both supercritical fluid flows (using a nonlinear equation of state like the van der Waals cubic equation of state) and gas flows (using an ideal gas law). The algorithm is introduced successfully in a finite volume code using the SIMPLE and SIMPLER methods. Its main advantage lies in the decoupling of the energy equation and equation of state from the momentum and continuity equations, leading to decrease significantly the CPU time in the case of supercritical fluids simulations. Moreover it allows for supercritical fluid flow simulations the use of other discretization methods (such as spectral methods and/or finite differences) and any other nonlinear form of the equation of state. The new algorithm is presented after a brief description of the previously existing algorithm to solve supercritical fluid flows. Then three published Benchmark problems for steady and unsteady ideal gas flows are treated, as well as the side heated cavity problem for a near critical carbon dioxide filling. The results are then compared to those obtained from the previous algorithm as well as to those obtained from a spectral code using the new algorithm. This comparative investigation is extended to the Rayleigh-Bénard problem for a near critical carbon dioxide filled square cavity with the use of the Van der Waals and the Peng-Robinson equations of state.

scholarly journals Development of uncertainty-aware equation-of-state models: Application to copper

2020 ◽  
Vol 128 (18) ◽  
pp. 185902
Author(s):  
S. J. Ali ◽  
D. C. Swift ◽  
C. J. Wu ◽  
R. G. Kraus
Keyword(s):  
Equation Of State ◽  
State Models

Solid-Fluid Phase Equilibria Measurement for Mixtures of Methane, Carbon-Dioxide and N-Hexadecane

2021 ◽  
Author(s):  
Oluwakemi Victoria Eniolorunda ◽  
Antonin Chapoy ◽  
Rod Burgass
Keyword(s):  
Experimental Data ◽  
Carbon Dioxide ◽  
Equation Of State ◽  
Phase Equilibria ◽  
Activity Coefficients ◽  
Fluid Phase ◽  
Ternary Mixtures ◽  
Binary Interaction ◽  
Thermodynamic Models ◽  
Methane Carbon

Abstract In this study, new experimental data using a reliable approach are reported for solid-fluid phase equilibrium of ternary mixtures of Methane-Carbon-dioxide- n-Hexadecane for 30-73 mol% CO2 and pressures up to 24 MPa. The effect of varying CO2 composition on the overall phase transition of the systems were investigated. Three thermodynamic models were used to predict the liquid phase fugacity, this includes the Peng Robison equation of state (PR-EoS), Soave Redlich-Kwong equation of state (SRK-EoS) and the Cubic plus Association (CPA) equation of state with the classical mixing rule and a group contribution approach for calculating binary interaction parameters in all cases. To describe the wax (solid) phase, three activity coefficient models based on the solid solution theory were investigated: the predictive universal quasichemical activity coefficients (UNIQUAC), Universal quasi-chemical Functional Group activity coefficients (UNIFAC) and the predictive Wilson approach. The solid-fluid equilibria experimental data gathered in this experimental work including those from saturated and under-saturated conditions were used to check the reliability of the various phase equilibria thermodynamic models.

Calculation of Density for Mixtures of Carbon Dioxide with Nitrogen and Methane from the ISM Equation of State

2005 ◽  
Vol 52 (2) ◽  
pp. 227-229 ◽  
Author(s):  
Behzad Haghighi ◽  
Mohammad Mehdi Papari ◽  
Maryam Niafari ◽  
Hamid Ghasemi
Keyword(s):  
Carbon Dioxide ◽  
Equation Of State
Sign in / Sign up

Export Citation Format

Share Document