Numerical study of water droplet dynamics in proton exchange membrane fuel cells
Başlık çevirisi mevcut değil.
- Tez No: 644730
- Danışmanlar: Belirtilmemiş.
- Tez Türü: Yüksek Lisans
- Konular: Hava ve Uzay Hekimliği, Havacılık Mühendisliği, Air and Space Medicine, Aeronautical Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2016
- Dil: İngilizce
- Üniversite: The University of Manchester
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 66
Özet
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Özet (Çeviri)
Water management is an important topic which affects the performance and durability of PEMFCs and it plays a significant role to increase the performance of PEMFCs. Principally, a certain amount of the existing water is desired to be in the polymer electrolyte membrane to improve the proton conductivity, whereas excessive water than desired causes the blockage of the microporous on the gas diffusion layer and arises flooding on the fuel cell. Although, several studies have been performed to observe water droplet dynamics in the flow channels, these phenomena cannot be understood clearly. In this study, numerical simulations have been used to investigate the water behaviours in the gas flow channel at cathode side. The procedure implemented for the numerical simulation of two-phase flow is the volume of fluid (VOF) technique. Equations of this method are solved by STAR CCM+. In the first case, effects of different static contact angles, various air inlet velocities and various dimensions of flow channel on water droplet, which occurs in the gas diffusion layer, have been examined. Water volume fraction and pressure drop in the gas flow channel have been determined and compared with existing studies. Results show that hydrophilic surfaces are helpful for removing water and increasing velocity favours water detachment but causes pressure drop in the channel. In the second case, two u-shaped micro channels, one with rectangular bend and the other with semi-circular bend, have been used in order to obtain water behaviour in the channels. Only changing shape of the channel corner effects have been investigated on water behaviours. Pressure drop, water distribution in the channel have been analysed and especially, water accumulation at the bend have been compared between the two geometries. The results show that the channel with rectangular bend is characterised by faster water removal than the channel with semi-circular bend.
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