How to defined the order of react ??
 

Hi........... i have four species (include hydrogen,oxygen,water vapor,nitrogen) in my model, i simulate two mixture to react in two channel. FOR EXAMPLE first mixtures :hydrogen ,water vapor this mixtures simulated in first flow channel second mixtures :oxygen ,water vapor,nitrogen this mixtures simulated in second flow channel How to defined order of react in the ""Define/ Materials/Mixture species""