Permeability identification of porous media in resin transfer moulding

Abstract

Fundamental research areas concerning Resin Transfer Moulding (RTM) are categorized in three main topics: Permeability identification, Flow analysis and Injection pressure predication. Some fundamental problems on permeability identification which is considered as a base of RTM researches are theoretically and experimentally examined. Under generalised boundary conditions of injection pressures or flow rates considered as time functions, several analytical solutions for both channel flows and radial flows through isotropic or anisotropic fiber preforms are developed. The gravitational effect is also considered, while these solutions are derived. By using these solutions in permeability identification measurements, it is no longer required that injection pressures or flow rates are to be constants as reported in current references. It is demonstrated that the effect of gravitation on two- or three-dimensional radial flows is to produce a translation of the wetted domain of medium. A moving coordinate system fixed at the centre of wetted area is proposed to avoid the gravitational effect on experiment measurements.

Eighty seven practical identification experiments are completed to validate these fundamental results and the proposed experiment methods. Further research problems into the theoretical results and experimental work are described.

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