Development of an Analysis Model for Thermal Hydraulics on a Liquid and Gas Two-phase Flow through a Microscale Porous Material

微尺度多孔材料液气两相流热水力学分析模型的开发

基本信息

批准号：
18560206
负责人：
MORI Hideo
金额：
$ 2.45万
依托单位：
Kyushu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18560206/
关键词：
Microporous material liquid and gas two-phase flow Analysis model Fuel cell Diffusion layer

项目摘要

For utilization and high-performance of a polymer electrolyte fuel cell, experiments on pressure drop and observation of behavior were carried out for liquid and gas two-phase flow through a microscale porous material and beside a numerical analysis was performed based on physical model, aimed at the two-phase flow of water liquid and gas of air and steam containing oxygen which flows through an electrode diffusion layer. The following results were obtained.1. For the estimation of the pressure drop, it is necessary to divide the diffusion layer into two parts of base material and water repellent material constituting it. Percentage of void for each of base and water repellent materials was determined from pore volume distribution data of the diffusion layer.2. Absolute permeability was determined for each of base and water repellent materials based on measurements of the pressure drop of a gas single-phase flow,.3. It was found that there was almost no effect of moisture content on th … More e pressure drop of the gas single-phase flow.4. Based on measurements of a liquid and gas two-phase flow, relative permeabilities of liquid and gas phases were obtained. Then, relative permeability of microscale porous material was found to be quite lower compared with the value calculated by the Wyllie equation used well conventionally.5. Relative permeabilities of liquid and gas phases for base and water repellent parts were reproduced well by the Burdine equation with capillary pressure of each phase estimated from the pore size distribution data.6. Contact angle was measured for each of base and water repellent materials.7. As the results of numerical analysis, it was found that evaporation of water was formed on the boundary between base and water repellent material parts, and that diffusion of the oxygen was easily blocked due to large saturation of the base material part. In addition, it was shown that, although the base part saturation could be made small by bringing pore distribution of the water repellent material close to that of the base part, it becomes impossible to hold moisture sufficient in the polymer electrolyte film. Less

为了利用和高性能对聚合物电解质燃料电池，对液体和气体两相通过显微镜多孔材料进行了对行为的实验和行为观察的实验，并基于物理模型进行了数值分析，旨在基于物理模型，旨在通过含氧和蒸汽的两种相位流动的氧气和蒸汽通过电极diff diff diff oferode diffs ofery overally模型进行。获得以下结果1。为了估计压降，有必要将扩散层分为基本材料的两个部分，并将其复制材料构成构成。从扩散层的孔体积分布数据确定了每个基料和水复制材料的空隙百分比。2。基于气体单相流量的压力下降的测量值.3，确定了基础和水复制材料的每种绝对渗透率。发现几乎没有水分含量对气体单相流的更多E压力下降。4。根据液体和气体两相流量的测量，获得了液相和气相的相对渗透率。然后，与经常使用的Wyllie方程计算得出的值相比，微观多孔材料的相对渗透性较低。5。液体和气相对基碱和水复制部分的相对渗透率很好地通过了Burdine方程来很好地再现，并从孔径分布数据中估算出每个相的毛细管压力。6。测量了每个基部和水复制材料的接触角7。作为数值分析的结果，发现水的蒸发是在基础和水复制物材料部分之间的边界上形成的，并且由于碱基材料部分的饱和度较大，因此很容易阻断氧气的扩散。此外，还表明，尽管可以通过将驱虫材料的孔分布靠近基础部分的孔分布来缩小，但在聚合物电解质膜上保持水分不可能。较少的