ISSN:
1434-6036
Keywords:
PACS. 05.70.Ln Nonequilibrium and irreversible thermodynamics – 82.60.Nh Thermodynamics of nucleation – 82.33.Pt Solid state chemistry
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract: Fronts of weakly exothermal chemical reaction may propagate in solids at very low temperatures ( 4K≤T≤77K) thanks to a quite unusual mechanism, involving a feedback between the heat produced by the reaction and the disruption of the solid matrix. In this class of phenomena, the reaction may be induced by mechanical constraints, without a large elevation of temperature. On the basis of a simple phenomenological model, we investigate ignition of a propagating front by initially (i) disrupting a localized zone of the solid matrix, or by (ii) introducing a temperature jump, leading to a thermal shock with strong temperature gradients. In particular, we show that reaction can be initiated by disrupting only a very small fraction of the sample. Applications to the problem of initiation of solid explosives by friction or shocks is briefly discussed.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/PL00011137
Permalink