Untitled

Mennola, Tuomas; Noponen, Matti; Aronniemi, Mikko; Hottinen, Tero; Mikkola, Mikko; Himanen, Olli; Lund, Peter

doi:10.1023/a:1026279431097

Cited by 43 publications

(21 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The model equations were solved using Comsol Multiphysics, which is a PDE solver, implementing the Finite Element Method. Formerly an extension of MATLAB, COMSOL Multiphysics has developed into its own independent platform based on C and has been used previously to model fuel cells [15][16][17].…”

Section: Solution Techniquementioning

confidence: 99%

“…For example, three dimensional models have been reported by Mazumder [11,12], and by Hu and Berning [13,14]. Noponen et al [15][16][17] used finite element software to model concentration and current distributions [15] and to map liquid saturation and temperature distributions [16,17] for comparison with experimental data. Commercial finite element software has also been used by Guevelioglu [18] to solve equations describing multi-component flow in diffusion layers and flow channels.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Modelling and experimental validation of a high temperature polymer electrolyte fuel cell

2007

View full text Add to dashboard Cite

A steady-state, isothermal, one dimensional model of a proton exchange membrane fuel cell (PEMFC), with a polybenzimidazole (PBI) membrane, was developed. The electrode kinetics were represented by the Butler-Volmer equation, mass transport was described by the multi-component Stefan-Maxwell equations and Darcy's law and the ionic and electronic resistances described by Ohm's law. The model incorporated the effects of temperature and pressure on the open circuit potential, the exchange current density and diffusion coefficients, together with the effect of water transport across the membrane on the conductivity of the PBI membrane. The polarisation curves predicted by the model were validated against experimental data for a PEMFC operating in the temperature range of 125-200°C. There was good agreement between experimental and model data of the effect of temperature and oxygen/air pressure on cell performance. The model was used to simulate the effect of catalyst loading and the Pt/carbon ratio on cell performance and, in the latter case, a 40 wt.% Pt/C ratio gave the highest peak power density.Notations A act Active area of catalyst particles (m 2 ) A D Anode diffusion region (No units) A M Anode microporous region (No units) A R Anode reaction region (No units) A F Anode flow region (No units) a Height of catalyst (m) b Width of catalyst (m) c i Molar density/concentration of component i (mol m -3 ) C D Cathode diffusion region (No units) C R Cathode reaction/catalyst region (No units) c Depth of catalyst (No units) D ij Stefan-Maxwell diffusivities (m 2 s -1 ) D eff ij Effective Stefan-Maxwell diffusivities (m 2 s -1 ) D ij Symmetric diffusivities (m 2 s -1 ) E Potential (V) E 0 0 Standard state reference potential (V) F Faraday constant (A s mol -1 ) G Gibbs free energy (J mol -1 ) H Enthalpy (J mol -1 ) I Cell current density (A m -2 ) j e Electronic current (A m -2 ) j i Ionic/proton current (A m -2 ) j o Exchange current density (A m -2 ) j o b Exchange current density at electrode b (A m -2 ) j o a Exchange current density in anode (A m -2 ) j b V Current density source term in cathode (A m -3 ) j a V Current density source term in anode (A m -3 ) j c V Current density source term in cathode (A m -3 ) J i Diffusion flux (kg m -2 s -1 ) k Permeability of the porous media (m 2 ) L Catalyst loading (g m -2 ) M Membrane region (No units) M cat Mass of the catalyst (g) M i Mass of species i (kg mol -1 ) n Number of electrons (No units) N i Total flux of species i (kg m -2 s -1 ) p Total pressure (m -1 kg s -2 )

show abstract

Section: Solution Techniquementioning

confidence: 99%

mentioning

confidence: 99%

Modelling and experimental validation of a high temperature polymer electrolyte fuel cell

2007

View full text Add to dashboard Cite

show abstract

“…There have been several recent experimental [3][4][5][6][7][8][9][10] and modeling [11][12][13][14][15][16] studies on planar air breathing fuel cells. In one of the few combined experimental and modeling studies of an air breathing PEMFC, Mennola et al concluded that their fuel cell was limited by water removal at 40 • C and by oxygen depletion at 60 • C [14]. In related work, the same group highlighted the importance of developing a significant temperature gradient between the fuel cell and the air to drive efficient oxygen transport to the cathode [17].…”

Section: Introductionmentioning

confidence: 99%

Engineering model of a passive planar air breathing fuel cell cathode

O’Hayre

Fábían

Litster

et al. 2007

Journal of Power Sources

View full text Add to dashboard Cite

The behavior of an air breathing fuel cell (ABFC) operated on dry-hydrogen in dead-ended mode is studied using theoretical analysis. A one-dimensional, non-isothermal, combined heat and mass transport model is developed that captures the coupling between water generation, oxygen consumption, self-heating and natural convection at the air breathing cathode. The model is validated against planar ABFC experimental measurements over a range of ambient temperatures. The model confirms the strong effect of self-heating on the water balance within passive ABFCs. Model analysis provides several conclusions: (1) thermal runaway caused by inadequate heat rejection predominantly limits ABFC performance. (2) The natural convection boundary layer represents a significant barrier to cathode mass and heat transfer. (3) Because the mass and heat transport numbers associated with natural convection are small, even slight forced convection dramatically affects cell behavior. (4) Performance optimization requires maximizing heat rejection while minimizing flooding. Decoupling the latter two phenomena is challenging due to the exponential relationship between water vapor saturation and temperature.

show abstract

“…The developed three-dimensional model for the air flow field and the cathode PTL is based on a 2D model developed by Mennola et al [52]. The steady-state continuity equation for mass (∇ · ρu = 0) is used and the free convection of air at the cathode channels is described with the Navier-Stokes equation (Eq.…”

Section: Air Flow Field and Porous Cathode Transport Layermentioning

confidence: 99%

“…Refs. [45,48,52,53]. Values of the critical pressure and temperature (p cr and T cr ) are taken from Ref.…”

Section: Parameters and Variablesmentioning

confidence: 99%

A 3D model for the free-breathing direct methanol fuel cell: Methanol crossover aspects and validations with current distribution measurements

Saarinen¹,

Himanen²,

Kallio³

et al. 2007

Journal of Power Sources

Self Cite

View full text Add to dashboard Cite

Untitled

Cited by 43 publications

References 25 publications

Modelling and experimental validation of a high temperature polymer electrolyte fuel cell

Modelling and experimental validation of a high temperature polymer electrolyte fuel cell

Engineering model of a passive planar air breathing fuel cell cathode

A 3D model for the free-breathing direct methanol fuel cell: Methanol crossover aspects and validations with current distribution measurements

Contact Info

Product

Resources

About