This title appears in the Scientific Report : 2008 

Characterization of water exchange and two-phase flow in porous gas diffusion materials by hydrogen-deuterium contrast neutron radiography
Mahnke, I.
Hartnig, Ch. / Kardjilov, N. / Messerschmidt, M. / Hilger, A. / Strobl, M. / Lehnert, W. / Banhart, J.
Brennstoffzellen; IEF-3
Applied physics letters, 92 (2008)
Melville, NY American Institute of Physics 2008
10.1063/1.2946664
Journal Article
Rationelle Energieumwandlung
Applied Physics Letters 92
J
Get full text
OpenAccess
OpenAccess
Please use the identifier: http://dx.doi.org/10.1063/1.2946664 in citations.
Please use the identifier: http://hdl.handle.net/2128/17139 in citations.
Liquid water exchange in two-phase flows within hydrophobic porous gas diffusion materials of polymer electrolyte membrane fuel cells was investigated spatially resolved with H-D contrast neutron radiography. A commonly used one-phase model is sufficient to describe water exchange characteristics at low water production rates. At higher rates, however, a significantly higher exchange velocity is found than predicted by a simple model. A new model for the water transport is derived based on an eruptive mechanism guided by Haines jumps, which is supported by recent experimental findings and leads to a very good agreement with the experiments. (c) 2008 American Institute of Physics.