Modeling self-propagating exothermic reactions in multilayer systems

Book · Thu Dec 31 04:00:00 EST 1998

OSTI ID:323515

Jayaraman, S; Mann, A B; Knio, O M; Van Heerden, D; Bao, G; Weihs, T P ^[1]

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1. Johns Hopkins Univ., Baltimore, MD (United States)

Self-propagating reactions in free-standing multilayer foils provide a unique opportunity to study very rapid, diffusion-based transformations in non-equilibrium material systems. To fully understand the coupling between mass and thermal diffusion controlling these reactions and to optimize the commercial use of reactive foils, the authors have undertaken analytical and numerical modeling. Their analytical model predicts an increase in the reaction velocities with decreasing bilayer thickness down to a critical bilayer thickness and a reversal in this trend below the critical thickness. Predicting reaction characteristics such as the flame thermal width, the reaction zone width and the effect of variations in material properties with temperature has proven analytically intractable. To overcome these limitations, the authors have also used numerical methods to determine the composition and temperature profiles ahead of the reaction front for different multilayer periods and premixing. The results are compared with experimental values where possible.

• Sponsoring Organization: National Science Foundation, Washington, DC (United States)
• OSTI ID: 323515
• Report Number(s): CONF-971201--
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
40 CHEMISTRY
ALUMINIUM
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
COMPOSITE MATERIALS
HEAT FLUX
MATHEMATICAL MODELS
MICROSTRUCTURE
MONEL
NICKEL
THEORETICAL DATA