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A comprehensive review of the modeling of transport phenomenon in the flow channels of polymer electrolyte membrane fuel cells

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FRONTIERS OF CHEMICAL SCIENCE AND ENGINEERING 2024年第8期18卷 94-0页

作者： Olukayode, Niyi Ye, Shenrong Hu, Mingruo Dai, Yanjun Chen, Rui Sui, Sheng Shanghai Jiao Tong Univ Inst Fuel Cell Shanghai 200240 Peoples R China Shanghai Jiao Tong Univ Inst Refrigerat & Cryogen Shanghai 200240 Peoples R China Loughborough Univ Low Carbon Engn Loughborough LE11 3TU Leics England

Reactant gas and liquid water transport phenomena in the flow channels are complex and critical to the performance and durability of polymer electrolyte membrane fuel cells. The polymer membrane needs water at an optimum level for proton conductivity. Water management involves the prevention of dehydration, waterlogging, and the cell's subsequent performance decline and degradation. This process requires the study and understanding of internal two-phase flows. Different experimental visualization techniques are used to study two-phase flows in polymer electrolyte membrane fuel cells. However, the experiments have limitations in in situ measurements; they are also expensive and time exhaustive. In contrast, numerical modeling is cheaper and faster, providing insights into the complex multiscale processes occurring across the components of the polymer electrolyte membrane fuel *** paper introduces the recent design of flow channels. It reviews the numerical modeling techniques adopted for the transport phenomena therein: the two-fluid, multiphase mixture, volume of fluid, lattice Boltzmann, and pressure drop models. Furthermore, this work describes, compares, and analyses the models' approaches and reviews the representative results of some selected aspects. Finally, the paper summarizes the modeling perspectives, emphasizing future directions with some recommendations.

关键词： two-phase flows numerical model flow channel polymer electrolyte membrane fuel cells water management LATTICE BOLTZMANN simulation GAS-DIFFUSION LAYER 3-dimensional numerical-simulation MULTIPHASE MIXTURE MODEL LIQUID WATER TRANSPORT CAPILLARY-POROUS MEDIA 2-PHASE PRESSURE-DROP METAL FOAM EX-SITU BIPOLAR PLATES

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Axisymmetry Breaking to Travelling Waves in the Cylinder with Partially Heated Sidewall

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Chinese Physics Letters 2006年第6期23卷 1515-1518页

作者：马东军孙德军尹协远 School of Engineering Science University of Science and Technology of China Hefei 230027

The transition from an axisymmetric stationary flow to three-dimensional time-dependent flows is carefully studied in a vertical cylinder partially heated from the side, with the aspect ratio A = 2 and Prandtl number Pτ=0.021. The flow develops from the steady toroidal pattern beyond the first instability threshold, breaks the axisymmetric state at a Rayleigh number near 2000, and transits to standing or travelling azimuthal waves. A new result is observed that a slightly unstable flow pattern of standing waves exists and will transit to stable travelling waves after a long time evolution. The onset of oscillations is associated with a supercritical Hopf bifurcation in a system with O（2） symmetry.

关键词： 3-dimensional numerical-simulation BUOYANCY-DRIVEN CONVECTION NATURAL-CONVECTION VERTICAL CYLINDER BRIDGMAN GROWTH INSTABILITIES BIFURCATIONS STABILITY FLOWS

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