In this paper we analyze the stability of the traveling wave solution for an ignition-temperature first-order reaction model of diffusional-thermal combustion in the case of high Lewis numbers (Le>1). In contrast to conventional Arrhenius kinetics where the reaction zone is infinitely thin, the reaction zone for stepwise temperature kinetics is of order unity. The system of two parabolic PDEs is characterized by a free interface at which ignition temperature Θi is reached. We turn the model to a fully nonlinear problem in a fixed domain. When the Lewis number is large, we define a bifurcation parameter m=Θi/(1−Θi) and a perturbation parameter ε=1/Le. The main result is the existence of a critical value mc(ε) close to mc=6 at which Hopf bifurcation holds for ε small enough. Proofs combine spectral analysis and non-standard application of Hurwitz's Theorem with asymptotics as ε→0.
Stability analysis and Hopf bifurcation at high Lewis number in a combustion model with free interface / Brauner, C. -M.; Lorenzi, L.; Zhang, M.. - In: ANNALES DE L INSTITUT HENRI POINCARÉ. ANALYSE NON LINÉAIRE. - ISSN 0294-1449. - 37:3(2020), pp. 581-604. [10.1016/j.anihpc.2020.01.002]
Stability analysis and Hopf bifurcation at high Lewis number in a combustion model with free interface
Lorenzi L.;
2020-01-01
Abstract
In this paper we analyze the stability of the traveling wave solution for an ignition-temperature first-order reaction model of diffusional-thermal combustion in the case of high Lewis numbers (Le>1). In contrast to conventional Arrhenius kinetics where the reaction zone is infinitely thin, the reaction zone for stepwise temperature kinetics is of order unity. The system of two parabolic PDEs is characterized by a free interface at which ignition temperature Θi is reached. We turn the model to a fully nonlinear problem in a fixed domain. When the Lewis number is large, we define a bifurcation parameter m=Θi/(1−Θi) and a perturbation parameter ε=1/Le. The main result is the existence of a critical value mc(ε) close to mc=6 at which Hopf bifurcation holds for ε small enough. Proofs combine spectral analysis and non-standard application of Hurwitz's Theorem with asymptotics as ε→0.File | Dimensione | Formato | |
---|---|---|---|
ABLZ-final_5_revised_3.pdf
Open Access dal 01/07/2022
Tipologia:
Documento in Post-print
Licenza:
Creative commons
Dimensione
1.04 MB
Formato
Adobe PDF
|
1.04 MB | Adobe PDF | Visualizza/Apri |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.