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Travelling Waves of Fast Cryo-chemical Transformations in Solids(Non-Arrhenius Chemistry of the ColdUniverse)

Published online by Cambridge University Press:  13 December 2008

V. Barelko*
Affiliation:
Institute of Problems in Chemical Physics, 142432 Chernogolovka, Russia
N. Bessonov
Affiliation:
Institute of Mechanical Engineering Problems, 199178 Saint Petersburg, Russia
G. Kichigina
Affiliation:
Institute of Problems in Chemical Physics, 142432 Chernogolovka, Russia
D. Kiryukhin
Affiliation:
Institute of Problems in Chemical Physics, 142432 Chernogolovka, Russia
A. Pumir
Affiliation:
Department of Mathematics, University of Nice, 06560, Valbonne, France
V. Volpert
Affiliation:
Institute of Mathematics, UMR 5208 CNRS, University Lyon 1, 69622 Villeurbanne, France
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Abstract

Propagation of chemical waves at very low temperatures, observed experimentally [V.V. Barelko et al., Advances in Chem. Phys. 74 (1988), 339-384.] at velocities of order  10 cm/s, is due to a very non- standard physical mechanism. The energy liberated by the chemical reaction induces destruction of the material, thereby facilitating the reaction, a process very different from standard combustion. In this work we present recent experimental results and develop a new mathematical model which takes into account mechanical and chemical processes. We carry out numerical simulations and suggest a simplified model in order to obtain an explicit expression for the wave speed. This modelling allows us to give a possible explanation of the existence of two modes of propagation observed experimentally and of the dependence of the speed of propagation on the radiation dose.

Type
Research Article
Copyright
© EDP Sciences, 2008

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