Model ID: 837
Ozone Combustion
Mass, energy and continuity equations, describing the flame, are coupled through dependencies upon the temperature, pressure and composition of the reacting flow. These relations are given by expressions for thermodynamic and transport properties, which are provided at the level of detail commonly used by the combustion community. The highly exothermic process rapidly increased the gas temperature to above 1600 K, accompanied by a corresponding velocity increase.
It is well known that a flame has a limited range of operating conditions. If these conditions are not held, the flame does not remain stationary but instead can oscillate or fade. The technical question this model seeks to answer is this: How does the velocity of the inlet gas affect the flame in general and the chemistry in particular?
This example formulates the chemical kinetics using the COMSOL Reaction Engineering Lab. The decomposition process furthermore made use of the predefined expressions for thermodynamics and transport properties in this package.
The stationary transport problem coupled to the chemical kinetics was then solved using three application modes from the Chemical Engineering Module and COMSOL Multiphysics: 1. Maxwell-Stefan Diffusion and Convection to describe the mass balances 2. Convection and Conduction to describe the overall energy balance 3. PDE, General Form to describe the continuity equation
The model varies velocity to observe this parameterís effect on the concentration profile of ozone. Results indicate that the reaction zone becomes very narrow as the velocity increases.
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Collage showing the concentration profiles of the oxygen species, the participating reactions, and the velocity in the 1D, premixed, laminar, steady-state flame |
Engineering Fields
- Reaction Engineering
- Equation-Based Modeling
- Benchmarking Studies
Application Areas
- Chemical Reaction Engineering
