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Water transport management of a prot...

Wayne State University., Mechanical Engineering.

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Water transport management of a proton exchange membrane fuel cell.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Water transport management of a proton exchange membrane fuel cell./
作者:	Quan, Peng.
面頁冊數:	142 p.
附註:	Adviser: Ming-Chia Lai.
Contained By:	Dissertation Abstracts International69-11B.
標題:	Engineering, Automotive. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3331440
ISBN:	9780549894261

Water transport management of a proton exchange membrane fuel cell.
Quan, Peng.

Water transport management of a proton exchange membrane fuel cell. - 142 p.

Adviser: Ming-Chia Lai.

Thesis (Ph.D.)--Wayne State University, 2009.

As a promising green energy converter, PEM fuel cell has been drawing numerous attentions from both industry and academia. In this dissertation, water management issue, which is critical in improving PEM fuel cell performance, was investigated both numerically and experimentally.

ISBN: 9780549894261Subjects--Topical Terms:

1018477
Engineering, Automotive.

Water transport management of a proton exchange membrane fuel cell.
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100 1 $a Quan, Peng. $3 1058284
245 1 0 $a Water transport management of a proton exchange membrane fuel cell.
300 $a 142 p.
500 $a Adviser: Ming-Chia Lai.
500 $a Source: Dissertation Abstracts International, Volume: 69-11, Section: B, page: 7106.
502 $a Thesis (Ph.D.)--Wayne State University, 2009.
520 $a As a promising green energy converter, PEM fuel cell has been drawing numerous attentions from both industry and academia. In this dissertation, water management issue, which is critical in improving PEM fuel cell performance, was investigated both numerically and experimentally.
520 $a Numerical study of water management in serpentine and interdigitated air flow channels was conducted. The results show that the channel surface wettability is an important design variable for both serpentine and interdigitated flow channel configurations. In a serpentine air flow channel, hydrophilic surfaces could benefit the reactant transport to reaction sites by facilitating water transport along channel edges or on channel surfaces; however, the hydrophilic surfaces would also introduce significantly pressure drop as a penalty; the channel geometry with sharp corners could be a better design option since it provides spaces for water accumulation and climbing-up onto upper surfaces, thus leaving more GDL surface area for reactant to access; the increased pressure drop for the sharp corner channel design is negligible; also the pressure drop increases almost linearly with the increasing inlet velocity. For interdigitated air flow channel design, it is observable that liquid water exists only in the outlet channel; it is also observable that water distribution inside GDL is uneven due to the pressure distribution caused by interdigitated structure; for a interdigitated flow field design, low pressure drop could easily lead to flooding in the outlet channel; the mechanisms of water removal vary for different operating pressure drops.
520 $a An in-situ water measurement method, neutron imaging technique, was used to investigate the water behavior in a PEM fuel cell. The neutron imaging results of dynamic water transport in a non-operational PEM fuel cell indicate that water transfer rate inside assemblies nonlinearly varies with time. Higher rate takes place when the wetting or drying process initiates; wetting with higher flowrate can enhance water transport in MEA; fine pores in catalyst layer facilitate water vapor transport to membrane and holding liquid water in the membrane to maintain membrane saturation; the time constant for drying process is significantly longer than that of wetting process. In the experiment using an operational PEM fuel, it demonstrates the capabilities of using the test data as reliable sources for mathematical model validation; in addition, Water content peak in the membrane was found close to catalyst layer for the low stoic case. The peak value increases with increasing current density and reaches its maximum at certain moderate current density then decreases due to heating effect at higher current density. Minimum water content can be observed inside GDLs, which is caused by the barriers from the hydrophobic nature of GDL pores. Finally, the PEMFC module in the FLUENT was used to build a PEM fuel cell model and preliminary model validation was performed using the previously obtained neutron results. It indicates that the current PEMFC module needs to be further improved to achieve better model predictabilities.
590 $a School code: 0254.
650 4 $a Engineering, Automotive. $3 1018477
650 4 $a Engineering, Chemical. $3 1018531
650 4 $a Engineering, Mechanical. $3 783786
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710 2 $a Wayne State University. $b Mechanical Engineering. $3 1057463
773 0 $t Dissertation Abstracts International $g 69-11B.
790 $a 0254
790 1 0 $a Lai, Ming-Chia, $e advisor
790 1 0 $a Lee, Joon $e committee member
790 1 0 $a Singh, Trilochan $e committee member
790 1 0 $a Zhang, Hongwei $e committee member
791 $a Ph.D.
792 $a 2009
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3331440