Olesen, Anders Christian3; Berning, Torsten3; Kær, Søren Knudsen3
1 Department of Energy Technology, The Faculty of Engineering and Science, Aalborg University, VBN2 The Faculty of Engineering and Science, Aalborg University, VBN3 Fluid Mechanics and Combustion, The Faculty of Engineering and Science, Aalborg University, VBN
The Fickian diffusivity of water in Nafion has been shown to exhibit a local maximum. In the present research effort it is shown that this spike vanishes if the equilibrium water content and chemical diffusivity are modeled carefully. Further, it is shown that permeation experiments falsely can generate a local maximum, if a wrong equilibrium water content relation is used. Finally, in order to study the obtained diffusivity model a parameter variation is carried out using a one-dimensional steady-state model. The effect of diffusivity model, surface roughness and water content driving force is studied.
E C S Transactions, 2012, Vol 50, Issue 2, p. 979-991