Propagation and ignition of fast gasless detonation waves of phase or chemical transformation in condensed matter
Institut Non Linéaire de Nice, 1361 route des Lucioles, 06560 Valbonne, France
2 Institute of Chemical Physics, RAS, Chernogolovka, Moscow Region, Russia
Corresponding author: a email@example.com
Published online: 15 July 2000
Fast self sustained waves of chemical or phase transformations, observed in several contexts in condensed matter effectively result in “gasless detonation". The phenomenon is modelled by coupling the reaction diffusion equation, describing chemical or phase transformations, and the wave equation, describing elastic perturbations. The coupling considered in this work involves (i) a dependence of the sound velocity on the chemical (phase) field, and (ii) the destruction of the initial chemical equilibrium when the strain exceeds a critical value (strain induced phase transition). Both the case of an initially unstable state (first order kinetics) and metastable state (second order kinetics) are considered. An exhaustive analytic and numerical study of travelling waves reveals the existence of supersonic modes of transformations. The practically important problem of ignition of fast waves by mechanical perturbation is investigated. With the present model, the critical strain necessary to ignite gasless detonation by local perturbations is determined.
PACS: 82.20.Mj – Nonequilibrium kinetics / 05.70.Ln – Nonequilibrium and irreversible thermodynamics
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2000