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Modeling and synchrotron imaging of droplet detachment in gas channels of polymer electrolyte fuel cells

Andersson, M. LU ; Mularczyk, A.; Lamibrac, A.; Beale, S. B.; Eller, J.; Lehnert, W. and Büchi, F. N. (2018) In Journal of Power Sources 404. p.159-171
Abstract

A computational fluid dynamics model of a channel (one liquid inlet, one liquid inlet and one two-phase outlet), applicable for PEFC gas channel water transport, is developed. A volume of fluid approach is used to study the two-phase flow behavior (interface-resolved) inside the gas channel, including the surface of GDL (gas diffusion layer), which is verified by experimental results from synchrotron based X-ray radiography and tomography imaging. A reasonably good agreement is found between the model and the measurements in terms of droplet dynamics, shape, and size. The channel height strongly influences the droplet transport behavior, with the droplet being attached to the GDL surface, as well as to the wall on the opposite side to... (More)

A computational fluid dynamics model of a channel (one liquid inlet, one liquid inlet and one two-phase outlet), applicable for PEFC gas channel water transport, is developed. A volume of fluid approach is used to study the two-phase flow behavior (interface-resolved) inside the gas channel, including the surface of GDL (gas diffusion layer), which is verified by experimental results from synchrotron based X-ray radiography and tomography imaging. A reasonably good agreement is found between the model and the measurements in terms of droplet dynamics, shape, and size. The channel height strongly influences the droplet transport behavior, with the droplet being attached to the GDL surface, as well as to the wall on the opposite side to the GDL at the same time for the shallowest channel (150 μm). The GDL contact angle influences the droplet size, with an increased GDL contact angle creating smaller droplets.

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Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Contact angle, GDL surface, Modeling, Polymer electrolyte fuel cells, Tomography imaging
in
Journal of Power Sources
volume
404
pages
13 pages
publisher
Elsevier
external identifiers
  • scopus:85055621634
ISSN
0378-7753
DOI
10.1016/j.jpowsour.2018.10.021
language
English
LU publication?
yes
id
a238b43a-8565-497a-bdd1-b6dcefe9c0ad
date added to LUP
2018-11-08 06:45:17
date last changed
2019-01-13 06:17:38
@article{a238b43a-8565-497a-bdd1-b6dcefe9c0ad,
  abstract     = {<p>A computational fluid dynamics model of a channel (one liquid inlet, one liquid inlet and one two-phase outlet), applicable for PEFC gas channel water transport, is developed. A volume of fluid approach is used to study the two-phase flow behavior (interface-resolved) inside the gas channel, including the surface of GDL (gas diffusion layer), which is verified by experimental results from synchrotron based X-ray radiography and tomography imaging. A reasonably good agreement is found between the model and the measurements in terms of droplet dynamics, shape, and size. The channel height strongly influences the droplet transport behavior, with the droplet being attached to the GDL surface, as well as to the wall on the opposite side to the GDL at the same time for the shallowest channel (150 μm). The GDL contact angle influences the droplet size, with an increased GDL contact angle creating smaller droplets.</p>},
  author       = {Andersson, M. and Mularczyk, A. and Lamibrac, A. and Beale, S. B. and Eller, J. and Lehnert, W. and Büchi, F. N.},
  issn         = {0378-7753},
  keyword      = {Contact angle,GDL surface,Modeling,Polymer electrolyte fuel cells,Tomography imaging},
  language     = {eng},
  month        = {11},
  pages        = {159--171},
  publisher    = {Elsevier},
  series       = {Journal of Power Sources},
  title        = {Modeling and synchrotron imaging of droplet detachment in gas channels of polymer electrolyte fuel cells},
  url          = {http://dx.doi.org/10.1016/j.jpowsour.2018.10.021},
  volume       = {404},
  year         = {2018},
}