Two-phase flow and evaporation in model fibrous media: Application to the gas diffusion layer of PEM fuel cells
O Chapuis, M Prat, M Quintard, E Chane-Kane… - Journal of Power …, 2008 - Elsevier
O Chapuis, M Prat, M Quintard, E Chane-Kane, O Guillot, N Mayer
Journal of Power Sources, 2008•ElsevierTwo-phase flow dominated by capillary effects in model fibrous media is studied combining
pore-network simulations and visualisations on transparent micromodels. It is shown that the
process of liquid water invasion in a hydrophobic medium can be simulated using the
classical invasion percolation algorithm provided that the contact angle (measured in air,
which is the wetting phase) is sufficiently far below 90°. For contact angles approaching 90°,
changes in the interface local growth mechanisms lead to changes in the invasion pattern …
pore-network simulations and visualisations on transparent micromodels. It is shown that the
process of liquid water invasion in a hydrophobic medium can be simulated using the
classical invasion percolation algorithm provided that the contact angle (measured in air,
which is the wetting phase) is sufficiently far below 90°. For contact angles approaching 90°,
changes in the interface local growth mechanisms lead to changes in the invasion pattern …
Two-phase flow dominated by capillary effects in model fibrous media is studied combining pore-network simulations and visualisations on transparent micromodels. It is shown that the process of liquid water invasion in a hydrophobic medium can be simulated using the classical invasion percolation algorithm provided that the contact angle (measured in air, which is the wetting phase) is sufficiently far below 90°. For contact angles approaching 90°, changes in the interface local growth mechanisms lead to changes in the invasion pattern. Then it is shown that the invasion pattern is dramatically different in a hydrophilic medium. Impact of wettability (hydrophobic vs. hydrophilic) on evaporation pattern is also analysed. In a last part, implications of the study findings on the water management problem in the gas diffusion layers (GDLs) of PEMFC are discussed. Our results provide pore-scale explanations to the advantages of hydrophobic GDLs.
Elsevier
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