Journal
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
Volume 53, Issue 9-10, Pages 1951-1966Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2009.12.060
Keywords
Passive DMFC; Water transport; Two phase model; Air filter layer
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Funding
- National Science Foundation [CBET-0730349]
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A two-dimensional, two-phase. non-isothermal model was developed to investigate the water transport characteristics in a passive liquid-feed direct methanol fuel cell (DMFC) The liquid-gas two-phase mass transport in the porous anode and cathode was formulated based oil multi-fluid model in porous media, and water and methanol crossover through the membrane were considered with the effect of diffusion, electro-osmotic drag. and convection The model enabled numerical investigation of the effects of various operating parameters, Such as current density, methanol concentration, and air humidity, as well as the effect of the cathode hydrophobic air filter layer, on the water transport and cell performance. The results showed that for the free-breathing cathode. gas species concentration and temperature showed evident differences between the cell and the ambient air The use of a hydrophobic air filter layer at the cathode helped to achieve water recovery from the cathode to the anode, although the oxygen transport resistance was increased to some extent. It was further revealed that the water transport can be influenced by the ambient relative humidity. (C) 2010 Elsevier Ltd All rights reserved
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