Surface effect on branching chain reactions in filtration combustion of gases

The existence of lean and rich concentration limits of the low-velocity regime of flame propagation was shown experimentally under filtration of a combustible gas mixture in narrow tubes. The values of the limits depend on the inner diameter of the tube. Experiments with an inhibitor affecting the concentration limits of combustion-wave propagation in tubes in a low-velocity regime showed that branching chain reactions occur in the filtration combustion wave and the concentrations of active centers thus exceed the equilibrium values. In the low-velocity regime, the surface of the narrow quartz tube slightly decreases the role of active centers in combustion-wave propagation.