variavel0=<b>Fernando Costa</b> - fernando@lcp.inpe.br INPE
<b>Abstract.</b> A simplified theoretical model describing the natural smoldering of cigarettes without drawing is developed. The steady propagation of infinitesimally thin fronts of drying, pyrolysis and char oxidation is calculated, considering circumferential heat losses and the convective-diffusive processes in the boundary layer. A smoldering transfer number is defined and the distribution profiles of density and temperature inside the cigarette are determined and compared to experimental data. Theoretical burning rates (~ 3 mm/min) and pyrolysis lengths (~ 10 mm) of cigarettes with no draw presented a good agreement with experiments.
<b>Keywords.</b> smoldering, cigarette, pyrolysis, char oxidation, burning.