Forbidden interval of propagation speed for exothermic chemical fronts.
We consider the propagation of an exothermic chemical front toward an unstable steady state. The hydrodynamic equations are solved numerically for increasing values of the activation energy of the reaction which controls the reaction front speed. For a large speed, the marginal stability criterion of the isothermal case is recovered. For a small speed, we observe two well-separated traveling waves: a heat front is preceding the reaction front. We find analytically a forbidden speed interval where the hydrodynamical system does not admit stationary traveling solutions.
Leda
M
M
Université Pierre et Marie Curie - Paris 6, UMR 7600 LPTMC, F-75005 Paris, France.
Lemarchand
A
A
Nowakowski
B
B