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Title: Characterisation of the diffusion properties of metal foam hybrid flow-fields for fuel cells using optical flow visualisation and x-ray computed tomography
Authors: Fly, Ashley
Butcher, Daniel S.A.
Meyer, Q.
Whiteley, Michael
Spencer, Adrian
Kim, Chang Soo
Shearing, Paul
Brett, Daniel J.L.
Chen, Rui
Keywords: Metal foam
Flow-field
PEMFC
Flow distribution
X-ray CT
Residence time
Issue Date: 2018
Publisher: © The Authors. Published by Elsevier
Citation: FLY, A. ...et al., 2018. Characterisation of the diffusion properties of metal foam hybrid flow-fields for fuel cells using optical flow visualisation and x-ray computed tomography. Journal of Power Sources, 395, pp. 171-178.
Abstract: The flow distribution behaviour of open-cell metallic foam fuel cell flow-fields are evaluated using ex-situ optical analysis and X-ray computed tomography (X-ray CT). Five different manifold designs are evaluated and flow distribution and pressure drop quantitatively evaluated with reference to applications in polymer exchange membrane fuel cells (PEMFC) and heat exchangers. A ‘hybrid’ foam flow-field is presented consisting of flow channels pressed into the foam to promote flow distribution and reduce pressure drop. Cross- and through-channel pressure drop measurements are conducted, along with X-ray CT analysis. Results using dyed water show that metallic foams provide excellent fluid distribution across the fuel cell flow-field, closely following the theoretical filling rate. The time for dye to cover 80% of the flow-field area was 61% faster with a foam flow-field then with no flow-field present. Pressure drop was seen to reduce with increasing foam inlet area to levels comparable to multi-serpentine flow-fields. The introduction of flow channels in the foam can further reduce pressure drop and provide more even filling of the foam, at the expense of increased residence time.
Description: This is an Open Access Article. It is published by Elsevier under the Creative Commons Attribution 4.0 Unported Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/
Sponsor: This work has been funded by the Engineering and Physical Sciences Research Council (EPSRC) under grant number EP/M023508/1 ‘Innovative concepts from electrode to stack’
Version: Published
DOI: 10.1016/j.jpowsour.2018.05.070
URI: https://dspace.lboro.ac.uk/2134/33472
Publisher Link: https://doi.org/10.1016/j.jpowsour.2018.05.070
ISSN: 0378-7753
Appears in Collections:Published Articles (Aeronautical and Automotive Engineering)

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