TY - JOUR

T1 - ASYMPTOTIC DERIVATION OF TWO MODELS IN FLAME THEORY ASSOCIATED WITH THE CONSTANT DENSITY APPROXIMATION.

AU - Matkowsky, B. J.

AU - Sivashinsky, G. I.

PY - 1979/1/1

Y1 - 1979/1/1

N2 - The general equations of combustion theory are considered. Two simplified models are derived for the leading term of such an expansion. Both are associated with the constant density approximation. In the first model, the equations of fluid dynamics are completely decoupled from the equations governing heat and mass transport. The resulting model is generally referred to as the constant density approximation, or as the diffusional thermal model. In the second model, there is a weak coupling between the equations of fluid dynamics and the equations for temperature and concentration. Specifically the coupling, which enters through the effect of variable density, which in turn is due to the thermal expansion of the gas in which a flame propagates, occurs only in the external forcing term, and not elsewhere in the fluid dynamical equations. Thus, authors' model is analogous to the Boussinesq model in hydrodynamics.

AB - The general equations of combustion theory are considered. Two simplified models are derived for the leading term of such an expansion. Both are associated with the constant density approximation. In the first model, the equations of fluid dynamics are completely decoupled from the equations governing heat and mass transport. The resulting model is generally referred to as the constant density approximation, or as the diffusional thermal model. In the second model, there is a weak coupling between the equations of fluid dynamics and the equations for temperature and concentration. Specifically the coupling, which enters through the effect of variable density, which in turn is due to the thermal expansion of the gas in which a flame propagates, occurs only in the external forcing term, and not elsewhere in the fluid dynamical equations. Thus, authors' model is analogous to the Boussinesq model in hydrodynamics.

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U2 - 10.1137/0137051

DO - 10.1137/0137051

M3 - Article

AN - SCOPUS:0018735812

VL - 37

SP - 686

EP - 699

JO - SIAM Journal on Applied Mathematics

JF - SIAM Journal on Applied Mathematics

SN - 0036-1399

IS - 3

ER -