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Thermal and electrochemical model of internal reforming solid oxide fuel cells with tubular geometry

Thermal and electrochemical model of internal reforming solid oxide fuel cells with tubular geometry,10.1016/j.jpowsour.2006.02.098,Journal of Power S

Thermal and electrochemical model of internal reforming solid oxide fuel cells with tubular geometry   (Citations: 14)
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A two-dimensional axisymmetric model of a tubular solid oxide fuel cell (SOFC) is presented. The model analyzes electrochemistry and heat transfer inside the cell with new approaches to thermal and chemical simulations being introduced. For the reforming process a new approach based on traditional hypotheses, equilibrium and kinetic theory, is proposed. Thus, there is not a single assumption for the reaction but both situations are taken as possible depending on composition and temperature; results show that equilibrium is reached near the entry zone of the cell and the reaction is kinetically controlled later. Thermally, a rigorous study of radiative heat exchange between the anodic gas and the anode surface is included in order to evaluate its effect on global performance. Results show that this effect can be neglected in most cases but, under certain operating conditions, deviations of up to 1% may appear.Additionally, other improvements have been done with respect to previous works: viscosity and electrical conductivity of gases depend on concentrations; evaluation of concentration losses includes a new description of binary diffusion coefficients; calculation of convective heat transfer coefficients includes thermal entry length and laminar/turbulent flow; heat generation in the inner part of the cell accounts for the heat release due to Joule effect.
Journal: Journal of Power Sources - J POWER SOURCES , vol. 160, no. 2, pp. 1074-1087, 2006
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    • ...Species flows at electrode are caused by concentration gradients between bulk flow and active site according to Sanchez et al. (2006)...
    • ...According to the research of Sanchez et al. (2006), reforming procedure is calculated in the methods of both kinetics and equilibrium...

    Bao-Gang Sanet al. Dynamic modeling of tubular SOFC for marine power system

    • ...During the last several decades, various thermal models have been established in the research on the internal mechanisms of the SOFC (Larrain et al., 2003; Sanchez et al., 2006; Ivanov, 2007)...

    Xiao-juan Wuet al. SOFC temperature evaluation based on an adaptive fuzzy controller

    • ...Although many researchers consider the water gas shift reaction to be at equilibrium [8, 9, 10, 11] since it is faster than the methane reforming reaction, in this study no equilibrium assumption is made for any of the reactions...

    S. R. Pakalapatiet al. Modeling of a Coal Syngas Based SOFC

    • ...Some authors (Fischer and Seume, 2006) use the Chapman‐Enskog formulation; some others (such as Campanari and Iora, 2004; Verda et al., 2005; Sánchez et al., 2006) use Fuller’s correlation to calculate the ordinary diffusion of species in mixtures, Di,j , as proposed by Fuller et al. (1966)...
    • ...Sánchez et al. (2006) consider the analysis of radiative heat transfer as mandatory for an accurate fuel cell model; the reason for their statement is the high view factor between injector tube and cathode and their high temperatures...
    • ...Albeit the authors present a 2D axisymmetric model of a tubular SOFC, they recognize that a fully 3D study must be done if the influence of peripheral cells on the global performance of the stack is to be evaluated (Sánchez et al., 2006)...

    Vittorio Verdaet al. Tubular Cells and Stacks

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