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The defense date of the thesis is 2009-08-04
The current date is 2019-07-19
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URN etd-0804109-170939 Statistics This thesis had been viewed 2044 times. Download 11 times. Author Yi-Fan Chang Author's Email Address No Public. Department Mechanical Engineering Year 2008 Semester 2 Degree Master Type of Document Master's Thesis Language zh-TW.Big5 Chinese Page Count 81 Title The Study of Fabrication and Performance on Wavy-Serpentine Flow Field in Proton Exchanges Membrane Fuel Cell Keyword PEM Fuel Cell Serpentine channel Flow field Flow field Serpentine channel PEM Fuel Cell Abstract The main modification of this study is to change the bending area of flow field plate into a gas mixing area in the serpentine channel of PEM fuel cell. The purpose of this design is to obtain more uniform flow distribution through numerous mixing in channel. Then, the drain flooded in the channel can be exhausted via higher the pressure drop.
There are in total of 42 channels in flow field. The collocation of flow field is based on the number of entry channel and the times of flow turning. The three kinds of flow field are 2 entry channels with 21 times of turning, 6 entry channels with 7 times of turning, and 14 entry channels with 3 times of turning. Based on the foregoing three types of arrangement, thereafter, the efficiency of fuel cell is investigated
In this study, the software of PHOENICS is adopted to simulate the simplified models of above-mentioned three kinds of flow field. By calculating out the pressure drop and flow distribution, fuel cell performance can be explored.
In experimentation, 42 straight channels in flow field have changed into wavy channels. The purpose of this design is to make fuel gas become turbulent in the flow channel that can increase the fuel gas into Gas Diffusion Layer（GDL）and then make the fuel gas have enough reaction to increase the efficiency of the fuel cell. The results of experimentation demonstrate that appropriate collocation of numbers of entry channels and times of turning can achieve higher performance of 944.61 mA/cm2 at 0.55V. Through suitable arrangement of numbers of entry channels and times of turning, the poor performance caused by unevenly-distributed gas and flooding stay in channel for long time can be avoided.
Advisor Committee Hong-Sen Kou - advisor
Ji-Jen Lee - advisor
chang-sheng wang - co-chair
shih-ping liao - co-chair
Files Date of Defense 2009-07-07 Date of Submission 2009-08-04