A Multiscale Approach for Building a Mechanism Based Catalysis Model for High Enthalpy Carbon Dioxide Flow. Thoemel, J., Lukkien, J., & Chazot, O. In 39th AIAA Thermophysics Conference, 6, 2007. American Institute of Aeronautics and Astronautics. ![A Multiscale Approach for Building a Mechanism Based Catalysis Model for High Enthalpy Carbon Dioxide Flow [pdf]](https://bibbase.org/img/filetypes/pdf.svg "pdf")
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Website doi abstract bibtex The principles of the gas-surface-interaction taking place in the chemically reacting flow around an atmospheric re-entry vehicle are investigated. It turns out that the currently very often used approach employing a recombination coefficient has a limited applicability. Serious concerns arise when the interaction model is extrapolated from ground to flight tests. A mechanism based approach taking into account every interaction step is therefore proposed for the carbon dioxide interaction with platinum. The necessary reaction rates are determined using a microscopic model, which are then used in a continuum viscous flow simulation. The dependence of the catalysis on the outer flow conditions and also on the wall temperature is demonstrated. Nomenclature γ recombination coefficient,-M rec number of recombining atoms, 1/(m 2 s) M ↓ number of impinging atoms, 1/(m 2 s) [X] concentration of generic species,mol/m 3 k reaction rate, m, mol, s W ads microscopic reaction rate, 1/s p pressure, P a A site area adsorption site, m 2 σ initial/microscopic sticking coefficient,1 m molecular mass, kg k b Stefan-Boltzmann constant, J/K T temperature, K u tangential velocity, m/s v perpendicular velocity, m/s h enthalpy, J/kg w mass production term, kg/m 3 , kg/m 2 c species mass f ν stochiometric coefficient Y partial pressure coefficient/ZGB parameter θ surface coverage Da Damköhler number (s) adsorption site V vacant adsorption site concentration, mol/m 2 Subscripts rec Recombining ref. reference ad Adsorption reac Reaction rel. relative ER Eley-Rideal-Mechanism LH Langmuir-Hinshelwood-Mechanism
@inproceedings{
title = {A Multiscale Approach for Building a Mechanism Based Catalysis Model for High Enthalpy Carbon Dioxide Flow},
type = {inproceedings},
year = {2007},
websites = {https://arc.aiaa.org/doi/10.2514/6.2007-4399},
month = {6},
publisher = {American Institute of Aeronautics and Astronautics},
day = {25},
city = {Reston, Virigina},
id = {03f30438-3abc-3a8f-86bb-2b009314445e},
created = {2022-06-09T14:34:27.212Z},
accessed = {2022-06-09},
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last_modified = {2022-06-09T14:34:28.041Z},
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confirmed = {false},
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citation_key = {thoemel:tp:2007},
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abstract = {The principles of the gas-surface-interaction taking place in the chemically reacting flow around an atmospheric re-entry vehicle are investigated. It turns out that the currently very often used approach employing a recombination coefficient has a limited applicability. Serious concerns arise when the interaction model is extrapolated from ground to flight tests. A mechanism based approach taking into account every interaction step is therefore proposed for the carbon dioxide interaction with platinum. The necessary reaction rates are determined using a microscopic model, which are then used in a continuum viscous flow simulation. The dependence of the catalysis on the outer flow conditions and also on the wall temperature is demonstrated. Nomenclature γ recombination coefficient,-M rec number of recombining atoms, 1/(m 2 s) M ↓ number of impinging atoms, 1/(m 2 s) [X] concentration of generic species,mol/m 3 k reaction rate, m, mol, s W ads microscopic reaction rate, 1/s p pressure, P a A site area adsorption site, m 2 σ initial/microscopic sticking coefficient,1 m molecular mass, kg k b Stefan-Boltzmann constant, J/K T temperature, K u tangential velocity, m/s v perpendicular velocity, m/s h enthalpy, J/kg w mass production term, kg/m 3 , kg/m 2 c species mass f ν stochiometric coefficient Y partial pressure coefficient/ZGB parameter θ surface coverage Da Damköhler number (s) adsorption site V vacant adsorption site concentration, mol/m 2 Subscripts rec Recombining ref. reference ad Adsorption reac Reaction rel. relative ER Eley-Rideal-Mechanism LH Langmuir-Hinshelwood-Mechanism},
bibtype = {inproceedings},
author = {Thoemel, Jan and Lukkien, Johan and Chazot, Olivier},
doi = {10.2514/6.2007-4399},
booktitle = {39th AIAA Thermophysics Conference}
}
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It turns out that the currently very often used approach employing a recombination coefficient has a limited applicability. Serious concerns arise when the interaction model is extrapolated from ground to flight tests. A mechanism based approach taking into account every interaction step is therefore proposed for the carbon dioxide interaction with platinum. The necessary reaction rates are determined using a microscopic model, which are then used in a continuum viscous flow simulation. The dependence of the catalysis on the outer flow conditions and also on the wall temperature is demonstrated. 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