The influence of the Lewis numbers of the reactants on the asymptotic structure of counterflow and stagnant diffusion flames

Journal Article · Sun Jan 01 00:00:00 EST 1989 · Combustion Science and Technology; (UK)

DOI:https://doi.org/10.1080/00102208908924033· OSTI ID:5091153

Seshadri, K; Trevino, C ^[1]

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1. California Univ., San Diego, La Jolla, CA (USA). Dept. of Applied Mechanics and Engineering Sciences

The asymptotic structure of counterflow and stagnant diffusion flames are analyzed in the limit for large values of the overall, nondimensional activation energy, T/sub a/, characterizing the rate of the reaction, and results are given for small values of the stoichiometric fuel to oxygen mass ratio. The chemical reaction between the fuel and the oxidizer is represented by a one-step, irreversible process. A new approach is developed to characterize the influence of the Lewis number of the fuel, L/sub F/, and the Lewis number of the oxidizer, L/sub O/, on the outer and inner structure of near equilibrium diffusion flames. Explicit algebraic formulas to predict the critical conditions of flame extinction are also given. The results developed here are used to obtain overall chemical kinetic rate parameters characterizing the gas phase oxidation of methane using previously measured values of the critical conditions of flame extinction.

• OSTI ID: 5091153
• Journal Information: Combustion Science and Technology; (UK), Vol. 64:4-6; ISSN 0010-2202
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
42 ENGINEERING
FLAMES
FUEL-AIR RATIO
METHANE
OXIDATION
ACTIVATION ENERGY
ALGEBRA
CALCULATION METHODS
CHEMICAL REACTION KINETICS
COUNTERFLOW SYSTEMS
DIFFUSION
LEWIS PEAK
OXYGEN
STOICHIOMETRY
TEMPERATURE DISTRIBUTION
THERMODYNAMICS
ALKANES
CHEMICAL REACTIONS
ELEMENTS
ENERGY
HYDROCARBONS
KINETICS
MATHEMATICS
NONMETALS
ORGANIC COMPOUNDS
REACTION KINETICS
400800* - Combustion
Pyrolysis
& High-Temperature Chemistry
420400 - Engineering- Heat Transfer & Fluid Flow