A two-dimensional, two-phase mass transport model for liquid-feed DMFCs

IF 5.5 3区材料科学 Q1 ELECTROCHEMISTRY

Electrochimica Acta Pub Date : 2007-06-10 DOI:10.1016/j.electacta.2007.03.069

W.W. Yang, T.S. Zhao

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引用次数: 146

Abstract

A two-dimensional, isothermal two-phase mass transport model for a liquid-feed direct methanol fuel cell (DMFC) is presented in this paper. The two-phase mass transport in the anode and cathode porous regions is formulated based on the classical multiphase flow in porous media without invoking the assumption of constant gas pressure in the unsaturated porous medium flow theory. The two-phase flow behavior in the anode flow channel is modeled by utilizing the drift-flux model, while in the cathode flow channel the homogeneous mist-flow model is used. In addition, a micro-agglomerate model is developed for the cathode catalyst layer. The model also accounts for the effects of both methanol and water crossover through the membrane. The comprehensive model formed by integrating those in the different regions is solved numerically using a home-written computer code and validated against the experimental data in the literature. The model is then used to investigate the effects of various operating and structural parameters, such as methanol concentration, anode flow rate, porosities of both anode and cathode electrodes, the rate of methanol crossover, and the agglomerate size, on cell performance.

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液馈dmfc的二维两相质量输运模型

本文建立了液进料直接甲醇燃料电池(DMFC)的二维等温两相质量输运模型。在经典多孔介质多相流动的基础上，不采用非饱和多孔介质流动理论中气体压力恒定的假设，建立了阳极和阴极多孔区域的两相质量输运方程。阳极流道内的两相流动行为采用漂移通量模型，阴极流道内的两相流动行为采用均匀雾流模型。此外，建立了阴极催化剂层微团聚模型。该模型还考虑了甲醇和水通过膜交叉的影响。利用自制的计算机代码对不同区域的综合模型进行了数值求解，并与文献中的实验数据进行了验证。然后，该模型用于研究各种操作和结构参数对电池性能的影响，如甲醇浓度、阳极流速、阳极和阴极的孔隙率、甲醇交叉速率和团聚体大小。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Electrochimica Acta 工程技术-电化学

CiteScore

11.30

自引率

6.10%

发文量

1634

审稿时长

41 days

期刊介绍： Electrochimica Acta is an international journal. It is intended for the publication of both original work and reviews in the field of electrochemistry. Electrochemistry should be interpreted to mean any of the research fields covered by the Divisions of the International Society of Electrochemistry listed below, as well as emerging scientific domains covered by ISE New Topics Committee.