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Pujol i SagarÃ³, Toni
Comas Hervada, Bruna 

We derive analytical expressions for the propagation speed of downward combustion fronts of thin solid fuels with a background flow initially at rest. The classical combustion model for thin solid fuels that consists of five coupled reactionconvectiondiffusion equations is here reduced into a single equation with the gas temperature as the single variable. For doing so we apply a twozone combustion model that divides the system into a preheating region and a pyrolyzing region. The speed of the combustion front is obtained after matching the temperature and its derivative at the location that separates both regions.We also derive a simplified version of this analytical expression expected to be valid for a wide range of cases. Flame front velocities predicted by our analyticalexpressions agree well with experimental data found in the literature for a large variety of cases and substantially improve the results obtained from a previous wellknown analytical expression  
http://hdl.handle.net/2072/208410  
eng  
American Physical Society  
Tots els drets reservats  
CombustiÃ³  Models matemÃ tics
Combustion  Mathematical models Combustibles Fuel 

Analytical expressions for the flame front speed in the downward combustion of thin solid fuels and comparison to experiments  
info:eurepo/semantics/article  
Recercat 