Multi-pass serpentine flow-fields to enhance under-rib convection in polymer electrolyte membrane fuel cells: Design and geometrical characterization |
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Authors: | Jin Hyun Nam Kyu-Jin Lee Sangho Sohn Charn-Jung Kim |
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Affiliation: | 1. School of Mechanical and Automotive Engineering, Kookmin University, Seoul 136-702, Republic of Korea;2. School of Mechanical and Aerospace Engineering, Seoul National University, Seoul 151-744, Republic of Korea |
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Abstract: | The flow-field for reactant distribution is an important design factor that influences the performance of polymer electrolyte membrane fuel cells (PEMFCs). Under-rib convection between neighboring channels has been recognized to enhance the performance of PEMFCs with serpentine flow-fields. This study presents a simple design method to generate multi-pass serpentine flow-fields (MPSFFs) that can maximize under-rib convection in a given cell area. Geometrical characterization indicates that MPSFFs lead to significantly higher under-rib convection intensities and more uniform conditions, such as reactant concentrations, temperature, and liquid water saturation, compared with conventional serpentine flow-fields. The implications of the enhanced under-rib convection due to MPSFFs on the performance of PEMFCs are discussed. |
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Keywords: | Polymer electrolyte membrane fuel cells Flow-field design Under-rib convection Multi-pass serpentine flow-field |
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