Effects of hydrophilic/hydrophobic properties on the water behavior in the micro-channels of a proton exchange membrane fuel cell

The mobility of water droplets and water films inside a straight micro-channel of a proton exchange membrane fuel cell was simulated to study the effects of the hydrophilic/hydrophobic properties on water behavior. The volume-of-fluid model in the FLUENT package was used to keep track of the deformation of the liquid–gas interface. The results show that the water moved faster on a hydrophobic surface. But a hydrophobic channel side-wall was a disadvantage for the gas diffusion when the MEA had a hydrophilic surface. A hydrophilic channel side-wall with a hydrophobic MEA surface could avoid water accumulation on the MEA surface. The water and gas distribution under this condition was advantageous for water discharge and gas diffusion.

[1]  C. Hebling,et al.  Visualization of water buildup in the cathode of a transparent PEM fuel cell , 2003 .

[2]  Ned Djilali,et al.  A 3D, Multiphase, Multicomponent Model of the Cathode and Anode of a PEM Fuel Cell , 2003 .

[3]  Biao Zhou,et al.  Liquid water transport in straight micro-parallel-channels with manifolds for PEM fuel cell cathode , 2006 .

[4]  Effects of oxidant fluid properties on the mobility of water droplets in the channels of PEM fuel cell , 2005 .

[5]  Ravindra Datta,et al.  Sorption in Proton-Exchange Membranes An Explanation of Schroeder’s Paradox , 2003 .

[6]  Shimshon Gottesfeld,et al.  The Water Content Dependence of Electro-Osmotic Drag in Proton-Conducting Polymer Electrolytes , 1995 .

[7]  S. Dutta,et al.  Numerical prediction of mass-exchange between cathode and anode channels in a PEM fuel cell , 2001 .

[8]  S. Barnett,et al.  Operation of ceria-electrolyte solid oxide fuel cells on iso-octane–air fuel mixtures , 2006 .

[9]  Biao Zhou,et al.  Liquid water transport in parallel serpentine channels with manifolds on cathode side of a PEM fuel cell stack , 2006 .

[10]  Alexander Wokaun,et al.  In Situ Investigation of Two‐Phase Flow Patterns in Flow Fields of PEFC’s Using Neutron Radiography , 2002 .

[11]  Alexander Wokaun,et al.  In situ diagnostic of two-phase flow phenomena in polymer electrolyte fuel cells by neutron imaging: Part A. Experimental, data treatment, and quantification , 2005 .

[12]  Chaoyang Wang,et al.  Visualization of Liquid Water Transport in a PEFC , 2004 .

[13]  J. Weidner,et al.  Diffusion of water in Nafion 115 membranes , 2000 .

[14]  Sadik Kakac,et al.  Two‐dimensional model for proton exchange membrane fuel cells , 1998 .

[15]  David L. Jacobson,et al.  In situ neutron imaging technique for evaluation of water management systems in operating PEM fuel cells , 2004 .

[16]  Adam Z. Weber,et al.  Effects of Microporous Layers in Polymer Electrolyte Fuel Cells , 2005 .

[17]  Chao-Yang Wang,et al.  Liquid Water Transport in Gas Diffusion Layer of Polymer Electrolyte Fuel Cells , 2004 .

[18]  Biao Zhou,et al.  Water behavior in serpentine micro-channel for proton exchange membrane fuel cell cathode , 2005 .

[19]  T. Springer,et al.  Water Uptake by and Transport Through Nafion® 117 Membranes , 1993 .