Applying the Macroscopic Chemistry Method to Dissociating Oxygen

Lilley, C. R. and Macrossan, M. N. (2007). Applying the Macroscopic Chemistry Method to Dissociating Oxygen. In: M. S. Ivanov and A. K. Rebrov, Proceedings of the 25th International Symposium on Rarefied Gas Dynamics. 25th International Symposium on Rarefied Gas Dynamics, St. Petersburg, Russia, (367-372). 21-28 July, 2006.

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Author Lilley, C. R.
Macrossan, M. N.
Title of paper Applying the Macroscopic Chemistry Method to Dissociating Oxygen
Conference name 25th International Symposium on Rarefied Gas Dynamics
Conference location St. Petersburg, Russia
Conference dates 21-28 July, 2006
Proceedings title Proceedings of the 25th International Symposium on Rarefied Gas Dynamics
Place of Publication Russia
Publisher Siberian Branch of the Russian Academy of Sciences
Publication Year 2007
Year available 2007
Sub-type Fully published paper
ISBN 978-5-7692-0924-6
Editor M. S. Ivanov
A. K. Rebrov
Volume 1
Start page 367
End page 372
Total pages 6
Collection year 2008
Language eng
Abstract/Summary The macroscopic chemistry method [Lilley and Macrossan, Phys. Fluids, v16, p2054, 2004] was developed to model non-equilibrium chemically reacting flows with the direct simulation Monte Carlo (DSMC) method. The macroscopic method uses kinetic temperatures, calculated from mean particle energies, to calculate reaction rates. For strongly non-equilibrium flows, it is possible the macroscopic method might ignore reactions that should result from high-energy collisions that occur in the high-energy tail of the collision energy distribution. This could result in a "rate-reducing" effect relative to conventional collision-based DSMC chemistry models that perform reactions based on the energy of each individual collision. This effect would be most pronounced for reactions with low activation energy. We test for this possible rate-reducing effect in the macroscopic method by calculating the hypersonic flow of dissociating oxygen, which has a low dissociation energy, over a blunt cylinder. The results are compared to those obtained with the most common collision-based DSMC chemistry method, the total collision energy model. The results are in close agreement and we find no rate-reducing effect with the macroscopic method. This result extends the scope of the macroscopic method, and demonstrates its potential for modelling reacting non-equilibrium gas flows with the DSMC method.
Subjects 240502 Fluid Physics
290299 Aerospace Engineering not elsewhere classified
Keyword DSMC
non-equilibrium chemistry
macroscopic method
Q-Index Code E1
Additional Notes see also: http://eprint.uq.edu.au/archive/00001972/; http://eprint.uq.edu.au/archive/00001986/ Published by the Siberian Branch of the Russian Academy of Sciences.

 
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Created: Tue, 08 Aug 2006, 10:00:00 EST by Michael N Macrossan on behalf of School of Engineering