壁面亲水性对DMFC阳极通道内气液两相流影响的数值模拟  

Simulation of effects of hydrophilic properties of channel walls on characteristics of gas-liquid two-phase flow in anode channel of DMFC

作　　者：柯新[1] 姚克俭[1] 王良华[1] 

机构地区：[1]浙江工业大学化学工程与材料学院绿色化学合成技术国家重点实验室培育基地,浙江杭州310032

出　　处：《化工进展》2008年第2期265-269,共5页Chemical Industry and Engineering Progress

基　　金：浙江省自然科学基金项目(Y406163)

摘　　要：采用计算流体力学软件FLUENT对DMFC阳极通道内的气液两相流进行数值模拟,考察了阳极通道壁面的亲水性质对通道内气液两相流的影响。模拟结果表明:当流道侧壁面为憎水性时,CO2气体排出速度较快,但不利于反应物向扩散层方向迁移;当流道侧壁面和扩散层(GDL)表面均为亲水性时,有利于反应物向GDL方向迁移,但CO2气体排出阳极通道的速度较慢;当流道侧壁面为亲水性、GDL表面为憎水性时,既有利于反应物向GDL方向迁移,又有利于CO2气体排出通道。The two-phase flow in an anode channel was simulated by commercial software Fluent to study the effects of hydrophilic/hydrophobic properties on liquid distribution and gas behavior. The results showed that carbon-dioxide gas moved quickly on the hydrophobic surface. But hydrophobic channel side-wall had little benefits on the reactants transportiing to the gas diffusion layer （GDL）. The reactants transportiing to GDL could be improved in an anode channel with hydrophilic channel side-wall and hydrophilic GDL surface, but it took more time for the gas to move out of the anode channel. An anode channel with hydrophilic channel side-wall and hydrophobic GDL surface avoided gas accumulation on the GDL surface, and facilitated the gas discharging and liquid transporting to GDL.

关 键 词：直接甲醇燃料电池 数值模拟 亲水性 憎水性 气液两相流 

分 类 号：TQ018[化学工程]