Fakulteta za gradbeništvo in geodezijo, Ljubljana (FGGLJ)
  • A multi-dimensional model to analyze large-area PEM fuel cells [Elektronski vir]
    Dujc, Jaka ; Schumacher, Jürgen O.
    The large area to thickness ratio and numerous coupled physical and electrochemical processes are the two main challenges of modeling the PEMFC. We reduced the 3D representation of a PEMFC into a ... combination of two parallel 2D regions, which are connected by the 1D regions (see Fig. 1). Thereby, we address the first obstacle, see [2]. The 2D regions capture all the significant in-plane phenomena, while the through-plane processes in the membrane electrode assembly are captured by the 1D regions. Further, by carefully choosing which processes/fields are included in the model and choosing their parameterizations, we address the second obstacle (see [1]). We divided the 2D+1D simulation into a global simulation steered by SESES [3] and a local simulation performed by a standalone C routine. The global simulation corresponds to the in-plane (2D) processes in the gas flow-field and the gas diffusion layers of the anode and the cathode side, while the 1D local simulations describe the processes in the membrane electrode assembly (MEA). In the 2D simulation we solve for the field variables related to: the electrostatic potential, the temperature, the concentration of water vapor, the concentration of hydrogen, the concentration of oxygen, the velocity and the pressure, while the 1D MEA behavior is described with seven field variables: the electrostatic potential of electrons and protons, the temperature field, the dissolved water content of the membrane, the water vapor concentration, the hydrogen concentration and the oxygen concentration. For the free flow in the channels we solve the incompressible Navier-Stokes equations, while Darcys law is considered for the porous medium of GDLs. We present the 2D+1D numerical model architecture and the corresponding solution procedure. Consistency check simulations and prototype simulations of fuel cells are shown. The results show that the 2D+1D approach is suitable to take into account the high aspect ratio between the in-plane and the through-plane dimensions of a PEFC. This is essential to simulate large-area fuel cells.
    Vir: Book of abstracts [Elektronski vir] (Str. 60)
    Vrsta gradiva - prispevek na konferenci ; neleposlovje za odrasle
    Leto - 2014
    Jezik - angleški
    COBISS.SI-ID - 8533345

    Povezava(-e):

    https://www.researchgate.net/profile/Michel_Prestat/publication/261364500_11th_Symposium_for_Fuel_Cell_and_Battery_Modeling_and_Experimental_Validation_-_Book_of_Abstracts/links/00b7d5341202920b29000000/11th-Symposium-for-Fuel-Cell-and-Battery-Modeling-and-Experimental-Validation-Book-of-Abstracts.pdf?origin=publication_detail

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