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Research Papers

Modeling Study of Anode Water Flooding and Gas Purge for PEMFCs

[+] Author and Article Information
Shuang Zhai

School of Automotive Studies,  Clean Energy Automotive Engineering Center, Sino-German Postgraduate School, Tongji University, 201804 Shanghai, China

Su Zhou1

School of Automotive Studies,  Clean Energy Automotive Engineering Center, Sino-German Postgraduate School, Tongji University, 201804 Shanghai, Chinasuzhou@tongji.edu.cn

Pengtao Sun

Department of Mathematical Sciences,  University of Nevada, Las Vegas, 4505 Maryland Parkway, Las Vegas, NV 89154

Fengxiang Chen, Jigao Niu

College of Automotive Engineering,  Tongji University (Jiading Campus), 4800 Caoan Road, Shanghai 201804, China

1

Corresponding author.

J. Fuel Cell Sci. Technol 9(3), 031007 (Apr 20, 2012) (9 pages) doi:10.1115/1.4006053 History: Received November 06, 2011; Revised December 07, 2011; Published April 19, 2012; Online April 20, 2012

A one-dimensional, dynamic proton exchange membrane fuel cells stack model is developed in this paper, where the transports of reactant and water (in both liquid and vapor phase) are described by partial differential equations (PDEs) in gas diffusion layers (GDLs) of both anode and cathode, and the lumped model is applied to channels and MEA. The boundary conditions needed for PDEs in GDLs are provided by the lumped model. In addition, the convection term is considered in PDEs for GDLs to describe the convection effect on hydrogen gas purge process on the anode side. As a result, the purge effect under medium current density (corresponding to ohmic polarization dominated region) can be simulated in an efficient manner by improving the mass transfer and reducing the effect of water back diffusion from cathode to anode. The presented gas purge model is validated by the experimental data obtained from our laboratory as well as other research group. The influence factors to the gas purge schedule on the anode side, such as the purge interval and purge time, are investigated as well.

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Copyright © 2012 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Comparison of the simulated and experimental data during purge events with i = 0.333 A/cm2

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Figure 2

Comparison of the simulated and experimental data during purge events with i = 0.463 A/cm2

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Figure 3

Comparison of the simulated and experimental data presented in Ref. [15]

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Figure 4

Comparison of apparent current densities of the models with and without convection term

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Figure 5

Comparison of voltages of the models with and without convection term

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Figure 6

Comparison of water concentrations of the models with and without convection term

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Figure 7

Comparison of anode liquid saturations of the models with and without convection term

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Figure 8

Comparison of apparent current densities of the models with and without convection term (load level is up to 1.5 times bigger than that shown in Fig. 4)

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Figure 11

Comparison of voltage’s evolutions under different purge time

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Figure 12

Comparison of apparent current density’s evolutions under different purge time

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Figure 9

Comparison of voltage’s evolutions under different purge interval

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Figure 10

Comparison of apparent current density’s evolutions under different purge interval

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