Numerical modeling of slip effects on methane oxidation on a catalytic surface

The rarefied gas effects on microscale heterogeneous oxidation of methane-air mixtures are numerically investigated by using in a stagnation point flow impinging onto a platinum surface. Emphasis is placed on the interaction between velocity, temperature and species concentration slips and detailed kinetic and transport processes at large Knudsen numbers. The results show that the slips effects affect the surface reaction rates. It is found that species and temperature slips can increase or decrease the catalytic oxidation rate the gas temperature is higher or lower than the catalytic surface temperature. Furthermore, the slip effects also change the radical distributions.