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Multiphysics modeling of fuel cells

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  1. Tez No: 400102
  2. Yazar: MUSTAFA FAZIL SERİNCAN
  3. Danışmanlar: DR. ALEVTİNA SMİRNOVA, DR. JEONG HO KİM, DR. UĞUR PAŞAOĞULLARI
  4. Tez Türü: Doktora
  5. Konular: Makine Mühendisliği, Mechanical Engineering
  6. Anahtar Kelimeler: Belirtilmemiş.
  7. Yıl: 2009
  8. Dil: İngilizce
  9. Üniversite: The University of Connecticut
  10. Enstitü: Yurtdışı Enstitü
  11. Ana Bilim Dalı: Belirtilmemiş.
  12. Bilim Dalı: Belirtilmemiş.
  13. Sayfa Sayısı: 225

Özet

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Özet (Çeviri)

Fuel cells are expected to resist permanent changes in performance over time, to tolerateunexpected changes in the ambient conditions for a stable operation, and to sustain astructural integrity under different operating conditions. However, during the operation,both solid oxide fuel cells (SOFC) and polymer electrolyte fuel cells (PEFC) are prone tomany hazards that may cause degradation of the performance even to the extent ofcomplete failure of these devices.In this study performance and degradation of SOFCs and PEFCs is studied. Acomputational modeling framework has been established to investigate the transportphenomena and the electrochemical performance as well as the mechanical behavior ofSOFCs and PEFCs.The electrochemical performance of the SOFC is investigated both in steady-stateand transient operations while elucidating the transport phenomena related to the fuel celloperation. The proposed computational framework for the SOFC comprises two separatemodels for the test furnace and the single cell in order to more accurately model theactual test system while decreasing the computational cost. The fuel cell performance intransient operation is also studied. The performance of the SOFC is investigated in caseof a failure in the fuel supply system. Mechanical behavior of the SOFC is alsoconsidered to help assessing the durability of the cells.The same modeling framework is utilized for the PEFCs to investigateelectrochemical and mechanical degradation during the fuel cell operation. To assess theperformance degradation as a result of gas contamination, a cation transport model ispresented. It is found that the effect of fuel side contamination of cationic species is muchmore significant than the air side contamination while there still is a significantperformance degradation associated with the latter.Further, the stresses induced during the PEFC operation due to the swelling andshrinkage of the membrane with hydration changes are investigated. The impact of theanisotropy in the gas diffusion layers on the mechanical stresses is investigated and foundto have a significant effect on the stress distribution in the membrane.

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