fieldid E-Thesis & Research สถาบันเทคโนโลยีไทย-ญี่ปุ่น
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บทคัดย่อ
NUMERICAL MODELING OF A POLYMER ELECTROLYTE FUEL CELL IN DIFFERENT COMMERCIAL FLOW FIELD GEOMETRIC CONFIGURATIONS USING ANSYS FLUENT : An improper designed flow field of a polymer electrolyte fuel cell (PEFC) stack can cause the maldistributions of current density, temperature, and water concentration, which lead to localized mechanical stress, flooding or drying of the membrane, and flooding in flow channel. These problems, consequently, reduce performance and shorten the membrane electrode assembly (MEA) lifetime. In this work, a numerical investigation on the distributions in six different flow field designs, namely single, three, and five channel serpentine; three and five channel parallel in series; and z-type parallel over 5 cm2 PEFC has been systematically carried out using CFD techniques via ANSYS FLUENT software. The model was validated with experimental data obtained from our previous work. The results revealed that, for a small size PEFC, the flow fields with a longer channel (less number of channels) provided both a better uniformity and cell performance. With the same number of channels, the parallel in series flow fields clearly performed better than the multi-channel serpentine flow fields in both uniformity and water management. However, the effect of flow field design on the PEFC performance was found lower than the length of channel. In summary, for making a small stack, the single channel serpentine is suggested to be used as a flow field with its outstanding performance.
ผู้แต่ง
Patcharawat Charoen-amornkitt
ประเภทสิ่งพิมพ์
วิทยานิพนธ์ (MET) 2014
ปีที่พิมพ์
1
เลขหน้า
100 p
หัวเรื่อง
Engineering Technology--Thesis
เอกสารฉบับเต็ม
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