ID#: 218
Abstract Title: The Convective-Conductive Mode of the Reaction Zone Propagation: A New Mechanism of Combustion of 'Gasless' Systems
Session Title: Gasless and Dust Containing Flames
Session Date: 7/30/01
Session Start Time: 3:40 PM
Contributing Author: Seplyarskii, B.S.
Organization: Institute of Structural Macrokinetics and Materials Science
Country: Russia
Authors: Boris S.Seplyarskii
Short Abstract: A convective- conductive mechanism of combustion has been proposed for explanation of an anomalously high combustion velocity observed in the 'gasless' systems titanium - carbon black and titanium - carbon black - polystyrene at one-dimensional infiltration of the impurity gases. Analysis of the experimental and theoretical data shows that under the condition of the impurity gas release the convective mechanism of combustion can occur only at spreading of the melt layer of one of the reagents forced by the gradient of the impurity gas pressures. Physical and mathematical models of convective-conductive combustion of 'gasless' systems are proposed for the directed infiltration of the impurity gases. They have been analyzed with the use of the approximate analytical and numerical methods. It has been found that at the initial stage of combustion the growth of the front velocity and the gas pressure obeys the exponential law provided there is a free volume exceeding that of the sample. The necessary and sufficient conditions of occurrence of the convective regime of the ‘gasless’ system combustion have been formulated. Analysis of the proposed model provides explanation to the experimentally observed difference in the specific feature of the ‘gasless’ system combustion at counter-front, co-front, and bilateral infiltration of the impurity gases.