Reduced two-phase model for analysis of the anode of a DMFC
2004 (English)In: Journal of the Electrochemical Society, ISSN 0013-4651, Vol. 151, no 12, A2157-A2172 p.Article in journal (Refereed) Published
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.
IdentifiersURN: urn:nbn:se:kth:diva-45902DOI: 10.1149/1.1819834ISI: 000225068500024ScopusID: 2-s2.0-10844293567OAI: oai:DiVA.org:kth-45902DiVA: diva2:453160
QC 201111012011-11-012011-11-012011-11-01Bibliographically approved