ID#: 226
Abstract Title: Combustion and Explosion of Condensed Reactive Systems as Result of Thermodynamics Stability Loss. New Ideology and Aspects
Session Title: Poster Session I
Session Date: 7/31/01
Session Start Time: 2:50 PM
Contributing Author: Shlensky, O.F.
Organization: Mendeleev University of Chemical Technology
Country: Russia
Authors: O. Shlensky
Short Abstract: Every condensed volatile or nonvolatile substance, including explosives, has an upper temperature boundary of their existence in the metastable state, i. e. the spi-nodal line. The spinodal line zone may be approach under intensive heating or another high-energy action. Near the spinodal every condensed reactive system transmutes into labile (unstable) state, i.e. it will be collapsed. The self-accelerate combustion and explosion processes we consider as result and development of thermodynamics stability loss which accurse near spinodal line. The spinodal zone may be approach with intensive heating during process of ignition, steady-stable combustion front propagation processes. This communication summarized the many years experimental and theoretical study of upper metastable phase state boundary (spinodal) and the specific pre-spinodal effects which take place near this boundary. Present day theory of combustion and explosion has been elaborated for the gas phase only, which has neither spinodal nor spinodal collapse. Therefore, the gas theory does not take into consideration any pre-spinodal physical or chemical effects (spinodal limitations of any physical properties: density, coductivity, and heat capasity). Mathematical models of Gas theory are especially invalids in the vicinity of the spinodal line. The new concept suggested overcomes this drawback and provides correct and adequate to physical nature new mathematical models for condensed reactive systems transformation. New relationships are developed, particularly, for thermal conduction equation, heat release function, adiabatic ignition delay period of self-ignition etc. They allow to make more precise the calculations and describing of combustion and explosive processes of condensed reactive systems.