Three-dimensional non-isothermal two-phase simulations of proton exchange membrane fuel cell

質子交換膜燃料電池模擬分析

徐勛博

指導教授 ： 林昭安

國立清華大學/工學院/動力機械工程學系/碩士(2009年)

https://doi.org/10.6843/NTHU.2009.00511

摘要

In the present study, we develop a two-phase, non-isothermal, three-dimensional model of PEMFC to simulate cell performance. The model is based on five conservation equations(mass, momentum, species, energy, charge) and the liquid water equation. In this model, it can describe the phase change of water by evaporation/condensation effect, and the water transportation from electro-osmotic
drag effect.
In the practical application of the PEM fuel cell, liquid water would exist at high current density, it reduce the diffusivity of the gas phase species. If the pores in
a porous media are occupied by liquid water, the gas phase species can not reach the catalyst layer. In past studies, effective medium theory is commonly adopted to calculated effective diffusivity. Here, we modify the effective diffusivity to simulate the area blockage effect due to the liquid water effect, validated by the network model
proposed by Nam and Kaviany[7], the effective medium theory always overestimates the cell performance at high current density. However in our model the novel formulation can predict the cell performance precise validated by experiment data. Finally, the "one-dimensional two phase and non-isothermal" model of MEA with MPL has been adopted. The micro porous layer will reduce the liquid water at gas
diffusion media and also improve the cell performance.

關鍵字

質子交換膜燃料電池 ； 多孔性材質

並列摘要

無資料

並列關鍵字

PEMFC ； CFD-ACE ； MPL

參考文獻

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[4] L. You, H. T. Liu, "A parametric study of the cathode catalyst layer of PEM fuel cells using a pseudo-homogeneous model," Int. J. Hydrogen Energy 26, 991 (2001)

[5] H. S. Chu, C. Yeh, F. Chen, "Effects of porosity change of gas diffuser on performance of proton exchange membrane fuel cell," J. Power Source 123, 1 (2003)