An integrated modelling approach o f C h e m i c a l V apour In ltration of a brous preform by m e t h yltrichlorosilane, featuring coupled reactor uid mechanics and porous medium gas transport has been developed. The coupling between transport/reaction phenomena inside and outside the preform is rather strong, both physically and numerically. An important counter-e ect of the reactive preform on the surrounding gas-phase composition is evidenced also, an appreciable dissymmetry of the densi

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... ion rate inside the preform , even with negligible convective transport inside it . Such an approach brings new informations for understanding the physico-chemical phenomena of CVI and new guidelines for preform densi cation optimisation.