Abstract
The propagation of premixed laminar flames with different Lewis numbers in open ducts of circular cross-section is investigated numerically in a thermal-diffusive model. Ducts with adiabatic and cold isothermal walls are considered. The existence of multiple solutions in the case of an isothermal wall is demonstrated and a quenching radius is determined. When the Lewis number is less than unity the flame velocities in ducts with an isothermal wall may exceed those in ducts with an adiabatic wall of the same diameter, because of the appearance of cellular structures, which increase the curvature effect triggered by the boundary conditions at the wall.
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