A numerical model of soot formation and oxidation has been examined in terms of the integrated soot volume fraction across a series of laminar diffusion flames. Agreement with experiments was found to be good. A comparison of the conversion rate of carbon to soot in the flames was also satisfactory. OH was shown to be the dominant oxidizer of soot low in the co-flow axisymmetric flames but as the flame tip was approached the calculations suggested that O2 became more important. Both species were important to the correct prediction of soot profiles. The rate of OH loss on soot was found to be comparable to the net rates of OH loss and formation by flame chemistry. These results indicate that soot may be a significant sink of OH and may, in fact, lead to local extinction of the reaction zone near the flame tip.
ASJC Scopus subject areas
- Chemical Engineering(all)
- Fluid Flow and Transfer Processes
- Physical and Theoretical Chemistry
- Energy Engineering and Power Technology
- Fuel Technology
- Mechanical Engineering