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Computational Thermal Sciences: An International Journal
ESCI SJR: 0.249 SNIP: 0.434 CiteScore™: 1.4

ISSN Imprimir: 1940-2503
ISSN On-line: 1940-2554

Computational Thermal Sciences: An International Journal

DOI: 10.1615/ComputThermalScien.2012005345
pages 379-386

NUMERICAL STUDY OF THE EFFECT OF HEAT LOSS ON TRIPLE FLAME PROPAGATION IN A POROUS WALLS CHANNEL

Faisal Al-Malki
Department of Mathematics, Taif University, Taif P.O. Box 888, Saudi Arabia

RESUMO

We numerically examine in this study the effect of heat loss on triple flame propagation in porous channels. Unlike previous studies that were based on a counterflow configuration, we consider a porous channel in which a nonstrained two-dimensional mixing layer is created as a result of the constant concentrations of the reactants−fuel and oxidizer− supplied at the walls. The problem is formulated mathematically within the framework of a thermodiffusive model and a single-step chemistry along with a volumetric heat loss, and then solved numerically using finite elements. The results have identified the effect of two main nondimensional parameters on flame propagation, namely the heat loss κ and the flame-front thickness ε. Such parameters are found to be crucial for the existence of multiple solutions and hysteresis phenomena characterizing distinct combustion regimes. The number and the domain of existence of multiple solutions are identified in the κ− ε plane. The overall impact of heat loss on triple flames is to a large extent found to be qualitatively similar to that reported for flame edges propagating in counterflow. The study has also described the transition of the flame structure across the combustion regimes, between triple flames, edge flames, and flame tubes.


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