Mathematical model of cavitation during resin film infusion process

The objective of this paper is to develop a mathematical model of pore formation during the resin film infusion (RFI) process. An analytical model is developed to describe the cavitation conditions in the resin during the RFI process. This approach leads to an understanding of the influence of different process parameters on bubble formation. Utilising a non-linear equation of filtration allows us to define the pressure distribution inside viscous liquid resin as a function of the external flux. The numerical simulation utilises a Flow Analysis Network technique to predict and track the movement of the free surface and a finite element method (FEM) to solve the set of governing equations for each successive flow front location. The fibres that form the woven fabric are assumed to behave as linearly elastic bodies with known moduli and the resin is a non-Newtonian viscous fluid. Based on the results obtained from this model, it is possible to carry out some practical recommendations related to the process parameters as well as to the design of specific moulds. Moreover, the optimum temperature profile is obtained based on the consideration of applied pressure and cavitation pressure. (C) 1999 Elsevier Science Ltd. All rights reserved.