Forced-Flow-Chemical Vapour Infiltration Model

2 Forced-Flow-Chemical Vapour Infiltration Model 

By forcing the precursor gases through the preform, the diffusion term in Equation (5.2) can be neglected, and the governing transport-reaction equation is rewritten as 

The concentration of the precursor along the pore can then be obtained as 

F-CVI processes take place far from the thermodynamic equilibrium. The dimensionless Peclet number, Pe, is used to describe this process [39]  

The Peclet number means the ratio of the mass transfer rate by convection mechanism into the pore to the mass transport rate by a diffusion mechanism. At 

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