Thermal diffusion effects in hydrogen-air and methane-air flames

The influence of thermal diffusion on the structure of hydrogen-air and met hane-ah names is investigated numerically using complex chemistry and detai led transport models. All the transport coefficients in the mixture, includ ing thermal diffusion coefficients, are evaluated using new algorithms whic h provide, at moderate computational costs, accurate approximations derived rigorously from the kinetic theory of gases. Our numerical results show th at thermal diffusion is important for an accurate prediction of name struct ure.