Computational Fluid Dynamics Modeling of （计算流体动力学建模的）.pdfVIP

Journal of The Electrochemical Society, 147 (12) 4485-4493 (2000) 4485 S0013-4651(00)08-104-0 CCC: $7.00 © The Electrochemical Society, Inc. Computational Fluid Dynamics Modeling of Proton Exchange Membrane Fuel Cells Sukkee Um,a C.-Y. Wang,a,*,z and K. S. Chenb,* aGATE Center for Advanced Energy Storage, Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, USA bEngineering Sciences Center, Sandia National Laboratories, Albuquerque, New Mexico 87185-0834, USA A transient, multidimensional model has been developed to simulate proton exchange membrane fuel cells. The model accounts simultaneously for electrochemical kinetics, current distribution, hydrodynamics, and multicomponent transport. A single set of conservation equations valid for flow channels, gas-diffusion electrodes, catalyst layers, and the membrane region are developed and numerically solved using a finite-volume-based computational fluid dynamics technique. The numerical model is validated against published experimental data with good agreement. Subsequently, the model is applied to explore hydrogen dilution effects in the anode feed. The predicted polarization curves under hydrogen dilution conditions are in qualitative agreement with recent experiments reported in the literature. The detailed two-dimensional electrochemical and flow/transport simulations further reveal that in the presence of hydrogen dilution in the fuel stream, hydrogen is depleted at the reaction surface,