Kinetics of Binder Oxidation

The mass flux associated with boimdaiy layer mass transfer is given by efi = 4irR Kg Co — Cq ) = ATiR KgCQ (15.16) 

If the concentration of O2 at the surface of the sphere, r = H, is near 0, the boundary layer mass transfer is the rate determining step. Simultaneously, there is a diffusive flux of O2 through the pores, J, given by 

The flux due to surface thermal degradation reaction is given by 

The total mass transfer is related to the total heat transfer, making sure that the amount of mass reacted is equal to the heat available for reaction. This balance gives 

The heat flux can be composed of two parts (1) the heat flux in the boundary layer. 

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