INFLUENCE OF THE RANDOM STRUCTURE OF AN INITIAL MATERIAL ON THE PROCESSES OF SELF-PROPAGATING HIGH-TEMPERATURE SYNTHESIS IN THIN FILMS
P. S. Grinchuk, O. S. Rabinovich, and N. V. Pavlyukevich UDC 536.46 Numerical simulation of the process of self-propagating high-temperature synthesis in two-dimensional systems, the physical prototypes of which are thin films, has been performed. The emphasis has been on consideration of the heterogeneity of the system and randomness in the spatial arrangement of its different components. It has been found that taking into account the randomness factor, all other things being the same, leads to a substantial change in the basic characteristics of both the combustion process (for example, of the wave velocity) and the end product of synthesis. It has been demonstrated that, first, the critical level of external heat loss decreases significantly as compared to the case of a uniform distribution of the reagents and, second, this characteristic undergoes an abrupt increase in the vicinity of the reagent concentration corresponding to the percolation threshold for the lattice used in simulation. A qualitative comparison of the simulation results with experimental works has been carried out. A. V. Luikov Heat and Mass Transfer Institute, National Academy of Sciences of Belarus, 15 P. Brovka Str., Minsk, 220072, Belarus; email: gps@hmti.ac.by. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 77, No. 3, pp. 82-92, May-June, 2004. Original article submitted May 28, 2003.