Combustion 04
Combustion 04 : (Abb: Comb) A steady-state exothermic, self-catalyzed chemical reaction with the characteristic ability to propagate through a combustible medium, usually a fuel and an oxidizer. These reactants can occur in gas, liquid, or solid phase, alone, or in any combination. The reaction produces heat, generally but not necessarily light, and a variety of products in the form of gases, vapors, particulates (smoke) and residues (ashes). See also: Fire. Note: The Most Common Oxidizer is Atmospheric Oxygen. The initiation of the process is called ignition; the terminal phase is called extinction. Both of these are transient manifestations of the combustion process. Condensed-phase combustion is usually referred to as glowing combustion, while gas-phase combustion is referred to as a flame. If the process is confined so that an appreciable pressure rise occurs, it is called an explosion. If the combustion wave propagates at supersonic speed, a shock front develops ahead of it, and the process is called detonation. Combustion involves strong interactions between chemical reactions and physical transport processes (diffusion thermal -conduction, thermal diffusion and in the case of detonation, viscosity as well). This strong interaction is responsible for the unique properties of combustion reactions: self propagation,nonequilibrium atom and radical1 concentrations in the reaction zone, and the emission of nonthermal light
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