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Reduced two-phase model for analysis of the anode of a DMFC
KTH, Superseded Departments, Mechanics.
KTH, Superseded Departments, Chemical Engineering and Technology.
KTH, Superseded Departments, Mechanics.ORCID iD: 0000-0002-8318-1251
KTH, Superseded Departments, Mechanics.
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2004 (English)In: Journal of the Electrochemical Society, ISSN 0013-4651, E-ISSN 1945-7111, Vol. 151, no 12, A2157-A2172 p.Article in journal (Refereed) Published
Abstract [en]

An isothermal two-phase ternary mixture model that takes into account conservation of momentum, mass, and species in the anode of a direct methanol fuel cell (DMFC) is presented and analyzed. The slenderness of the anode allows a considerable reduction of the mathematical formulation, without sacrificing the essential physics. The reduced model is then verified and validated against data obtained from an experimental DMFC outfitted with a transparent end plate. Good agreement is achieved. The effect of mass-transfer resistances in the flow field and porous backing are highlighted. The presence of a gas phase is shown to improve the mass transfer of methanol at higher temperatures (>30 degreesC). It is also found that at a temperature of around 30 degreesC, a one-phase model predicts the same current density distribution as a more sophisticated two-phase model. Analysis of the results from the two-phase model, in combination with the experiments, results in a suggestion for an optimal flow field for the liquid-fed DMFC.

Place, publisher, year, edition, pages
2004. Vol. 151, no 12, A2157-A2172 p.
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-45902DOI: 10.1149/1.1819834ISI: 000225068500024Scopus ID: 2-s2.0-10844293567OAI: oai:DiVA.org:kth-45902DiVA: diva2:453160
Note
QC 20111101Available from: 2011-11-01 Created: 2011-11-01 Last updated: 2017-12-08Bibliographically approved

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Vynnycky, MichaelLindbergh, Göran

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