Chemical Reactions and Gaseous Equilibrium

2003 ◽  
Vol 31 (1) ◽  
pp. 32-62
Author(s):  
J. D. Lewins
Keyword(s):  
Chemical Reactions ◽  
Chemical Equilibrium ◽  
Computer Programme ◽  
Gibbs Function ◽  
Explicit Formulae ◽  
Combustion Processes

The article gives a methodology for determining the direction of a reaction and the point where gaseous equilibrium exists, emphasising the minimum of the Gibbs function at chemical equilibrium. A new result is offered, Lewins' law on the effect of dilution and explicit formulae are given for some major reactions. The calculations involved can be readily performed with the aid of a computer programme. This approach is seen as particularly helpful for students of combustion processes who lack a chemistry background.

What is a Chemical Equilibrium State?*

2015 ◽  
Vol 137 (2) ◽  
Author(s):  
Gian Paolo Beretta ◽  
Elias P. Gyftopoulos
Keyword(s):  
Equilibrium State ◽  
Chemical Reactions ◽  
Chemical Equilibrium ◽  
Simple System ◽  
Equilibrium Equations

We review the chemical equilibrium equations, and conclude that both their derivation and their meaning are problematic. We find that these equations can be established for a suitably defined simple system without chemical reactions.

scholarly journals Will mixing rule or chemical reactions dominate the ash behavior of biomass mixtures in combustion processes on laboratory and pilot scales?

Fuel ◽  
2022 ◽  
Vol 308 ◽  
pp. 122050
Author(s):  
Emile Atallah ◽  
Françoise Defoort ◽  
Matthieu Campargue ◽  
Alexander Pisch ◽  
Capucine Dupont
Keyword(s):  
Chemical Reactions ◽  
Mixing Rule ◽  
Combustion Processes

Simulation of a CO-H2-Air Turbulent Diffusion Flame by the Chemical Equilibrium Method With a Few Chemical Reactions

2008 ◽  
Author(s):  
Kazui Fukumoto ◽  
Yoshifumi Ogami
Keyword(s):  
Chemical Reactions ◽  
Chemical Equilibrium ◽  
Diffusion Flame ◽  
Turbulent Diffusion ◽  
Equilibrium Model ◽  
Combustion Products ◽  
Turbulent Diffusion Flame ◽  
Chemical Mechanisms ◽  
Computational Data ◽  
Chemical Equilibrium Model

The aim of our research is to build a model that can evaluate the amount of combustion products by using the chemical equilibrium method with a few chemical reactions. This paper presents an eddy dissipation concept/chemical equilibrium model (EDC/CE) and validates it by simulating a CO-H2 air turbulent diffusion flame. The obtained results were compared with Correa’s experimental data, Gran’s computational data, and the computational data obtained by using a chemical equilibrium model in FLUENT. An advantage of the EDC/CE model is that the amount of any combustion products are obtained without using detailed chemical mechanisms. The results obtained by the EDC/CE model are in good agreement with the reference data. With the combustion model that we have developed, the amount of combustion products can be calculated without detail chemical mechanisms, and the accuracy of this model is in the same order as that of the EDC model.

Equivalent Gibbs Function Continuation for Multi-Temperature Plasmas in Chemical Equilibrium

2021 ◽  
Author(s):  
Pedro Dinis Caseiro Jorge ◽  
James B. Scoggins ◽  
Thierry E. Magin ◽  
Nagi N. Mansour
Keyword(s):  
Chemical Equilibrium ◽  
Gibbs Function

The rôle of diffusion during catalysis by colloidal metals and similar substances.

1905 ◽  
Vol 74 (497-506) ◽  
pp. 356-369 ◽  
Author(s):  
Henry J. S. Sand ◽  
John Henry Poynting
Keyword(s):  
Chemical Reactions ◽  
Chemical Equilibrium ◽  
Heterogeneous Systems ◽  
Heterogeneous Reactions ◽  
Diffusion And Convection ◽  
Two Phases ◽  
Special Instance ◽  
Kinetics Of

In a paper on reaction-velocities in heterogeneous systems, Nernst has recently put forward the view that all chemical reactions taking place on the boundary of two phases proceed to equilibrium practically instantaneously, and that the velocities actually observed are simply those with which diffusion and convection renew the reacting material at the boundary. As a special instance of heterogeneous reactions, he mentions catalytic decompositions due to finely divided particles, such as colloidal metals, and he believes it probable that the kinetics of these reactions can be deduced from the assumption that chemical equilibrium remains permanently established on the surface of the particles.

scholarly journals Some Aspects of Time-Reversal in Chemical Kinetics

Entropy ◽  
2020 ◽  
Vol 22 (12) ◽  
pp. 1386
Author(s):  
Ulrich Maas
Keyword(s):  
Chemical Kinetics ◽  
Time Scales ◽  
Chemical Reactions ◽  
Chemical Equilibrium ◽  
Time Reversal ◽  
Elementary Reactions ◽  
Chemical Systems ◽  
Composition Space ◽  
Transient Relaxation ◽  
Lower Dimensional

Chemical kinetics govern the dynamics of chemical systems leading towards chemical equilibrium. There are several general properties of the dynamics of chemical reactions such as the existence of disparate time scales and the fact that most time scales are dissipative. This causes a transient relaxation to lower dimensional attracting manifolds in composition space. In this work, we discuss this behavior and investigate how a time reversal effects this behavior. For this, both macroscopic chemical systems as well as microscopic chemical systems (elementary reactions) are considered.

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