Aufgabensammlung Numerische Methoden. Aufgaben by Hagander N., Sundblad Y.

By Hagander N., Sundblad Y.

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However, various source terms have to be considered here to account for heat transfer between the gases and the solid matrix as well as ohmic heating. In detail, the following equations are being solved: Chapter 2 - A Three-Dimensional, One-Phase Model of a PEM Fuel Cell 38 Gas-Di¤usion Layers Since this whole domain is considered a conducting solid, the only variable of interest is the temperature. 26) where the term on the right-hand side accounts for the heat transfer from- and to the gas phase.

Hence, for a desired current density i the local current density can be obtained by knowledge of the local oxygen concentration and the average oxygen concentration at the catalyst layer. Chapter 2 - A Three-Dimensional, One-Phase Model of a PEM Fuel Cell 37 Membrane The membrane in the main computational domain is simply used as a separator between the anode and the cathode side. It is considered impermeable for the reactant gases. Properties of interest in the membrane are the liquid water ‡ux, which is accounted for in subdomain II, and the electrical potential distribution, which is calculated in subdomain III.

In addition, adventitious reactions can cause a mixed-potential in the absence of a net current; one example is the surface oxidation of P t [30]: P t + 2H2 O ! 32) This reaction has an equilibrium potential of E 0 = 0:88 V, which reduces the observed equilibrium potential for the fuel cell. 2. Activation losses are caused by the slowness of the reactions taking place on the surface of the electrodes. A proportion of the voltage generated is lost in driving the chemical reaction that transfers the electrons to or from the electrode.

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