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Research Papers

Numerical Simulation of Multispecies Mass Transfer in a SOFC Electrodes Layer Using Lattice Boltzmann Method

[+] Author and Article Information
Han Xu

School of Energy and Power Engineering,
Xi'an Jiaotong University,
Xi'an, Shaanxi 710049, China
e-mail: xuhan.2008@stu.xjtu.edu.cn

Zheng Dang

Department of Building Environment and Equipment Engineering,
Xi'an Jiaotong University,
Xi'an, Shaanxi 710049, China
e-mail: zdang@mail.xjtu.edu.cn

Bo-Feng Bai

School of Energy and Power Engineering,
Xi'an Jiaotong University,
Xi'an, Shaanxi 710049, China

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF FUEL CELL SCIENCE AND TECHNOLOGY. Manuscript received August 6, 2012; final manuscript received September 11, 2012; published online October 22, 2012. Editor: Nigel M. Sammes.

J. Fuel Cell Sci. Technol 9(6), 061004 (Oct 22, 2012) (6 pages) doi:10.1115/1.4007791 History: Received April 01, 2011; Revised April 18, 2012

A two-dimensional multicomponent lattice Boltzmann (LB) model based on kinetic theory for gas mixtures combined with a representative elementary volume (REV) scale LB algorithm based on the Brinkman equation for flows in porous media is developed to simulate the mass transport in the porous anode and cathode of solid oxide fuel cell (SOFC). The concentration overpotential is calculated and compared with that obtained by the extended Fick's model (FM), the dusty gas model (DGM), and the Stefan Maxwell model (SMM), as well as the experimental results. It is concluded that LB method is a much more accurate method for the simulation of mass transfer within fuel cell electrodes. Moreover, the effects of different electrode geometrical and operating parameters on concentration polarization are also investigated.

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References

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Figures

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Fig. 1

Schematic of mass transfer through the representative domain of porous anode and cathode

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Fig. 4

Comparison of measured and calculated Vcon at 10,000 A · m−2 in a H2–H2O–Ar system

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Fig. 3

Comparison of measured and calculated Vcon at 7000 A · m−2 in a H2–H2O–Ar system

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Fig. 2

Comparison of measured and calculated Vcon at 3000 A · m−2 in a H2–H2O–Ar system

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Fig. 5

Effect of anode thickness on concentration polarization

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Fig. 6

Effect of porosity on concentration polarization

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Fig. 7

Effect of hydrogen molar fraction on concentration polarization

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Fig. 8

Effect of operating temperature on concentration polarization

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