Stress effects on hydrogen permeation through membranes: modeling and simulation
J.L.C.S. Feitosa1; A.G.B. da Cruz1; Angela C. Souza2; Fernando P. Duda1
1 COPPE/PEM - UFRJ; 2 PGMEC/TEM - UFF
doi:10.20906/CPS/COB-2015-2683
Resumo
Hydrogen permeation in metals is a subject of great relevance in several technological applications. For instance, metallic membranes have been used with success for hydrogen purification and separation processes. Palladium-based membranes are particularly suited to this purpose due to their high permeability and good surface properties. Despite their advantages, palladium-based membranes are usually too expensive for large-scale applications. This has led to the development of multilayer membranes, where a low-cost material such as tantalum, niobium and vanadium, is coated with palladium. This work deals the formulation and numerical simulation of a continuum model for investigating the effects of the stress on hydrogen permeation in multilayer tubular membranes. In this case, the stress affects not only hydrogen transport and ingress/egress, but also the continuity of the hydrogen content across the interface between two materials. The novelty here is the treatment of this interface condition and its corresponding numerical implementation. The numerical simulation is implemented by using COMSOL Multiphysics.
Palavras-chave: Multilayer membranes; Palladium; Hydrogen diffusion; Stress-induced diffusion; Finite element