Enhanced Diffusion in Polymer Electrolyte Membrane Fuel Cells Using Oscillating Flow

Title
Enhanced Diffusion in Polymer Electrolyte Membrane Fuel Cells Using Oscillating Flow
Authors
황용신이대영최종원김서영조성호박준호김민수장재혁김성한차석원
Keywords
PEMFC; Enhanced diffusion; oxygen concentration; Oscillating flow; Frequency; Sweep distance
Issue Date
2010-04
Publisher
International journal of hydrogen energy
Citation
VOL 35, NO 8, 3676-3683
Abstract
This study investigates the enhancement of the oxygen diffusion rate at the cathode of a proton exchange membrane fuel cell (PEMFC) due to pure oscillating flow. A unit cell of PEMFC using hydrogen fuel and oscillating air was tested. The experimental results show that the non-dimensional effective diffusivity varies linearly with the square of the Womersley number, when the Womersley number is close to unity. The non-dimensional effective diffusivity varies linearly with the Womersley number itself when the Womersley number is much larger than unity. Similar trend has been confirmed from the theoretical approach. Under the experimental conditions in this study, the reaction rate of oxygen increased linearly with respect to the sweep distance. The experimental results showed that a power density of 115.4 mW/cm2 was obtained from the unit cell with oscillating flow, which is comparable to that obtained with forced flow. Therefore, an oscillating flow is found to be able to increase the concentration of the oxygen in the channel of PEMFCs, and consequently enhances mass-transfer, similarly to the use of forced flow using blowers or compressors.
URI
http://pubs.kist.re.kr/handle/201004/38522
ISSN
0360-3199
Appears in Collections:
KIST Publication > Article
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