HOMOGENIZATION OF A DISCRETE NETWORK MODEL FOR CHEMICAL VAPOR INFILTRATION PROCESS

Chemical vapor infiltration (CVI) is an important engineering process for manufacturing composite materials. Reaction-diffusion of the reactant gas and the structure change are two mutual influence processes. Some works have been done on the multi-scale modeling and simulation for the CVI process. The homogenization theory has not been rigorously established for the coupled nonlinear system on the concentration of the reactant gas and porosity of the media yet. In this work, we establish a discrete multi-scale node-bond network model for CVI process which contains a spatially discrete reaction-diffusion equation coupled with a spatially discrete porosity evolution equation. The tortuosity factor for the bonds in the node-bond structure is considered. The corresponding continuous homogenized system for the discrete model is given and the error estimation between the solutions of the homogenized system and the discrete one is derived.