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黏合物质与压缩变形对燃料电池气体扩散层孔隙结构和气体渗透特性的影响
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作者 廖屹峰 李伟鹏 《上海交通大学学报》 EI CAS CSCD 北大核心 2023年第7期899-909,共11页
在气体扩散层(GDL)生产过程中,疏水黏合处理和装配压缩变形导致GDL孔隙结构和渗透特性发生变化.首先基于随机重构算法,建立一种添加黏合物质和施加不均匀压缩的GDL建模方法;然后利用格子玻尔兹曼数值仿真气体单相流动,研究黏合物质与压... 在气体扩散层(GDL)生产过程中,疏水黏合处理和装配压缩变形导致GDL孔隙结构和渗透特性发生变化.首先基于随机重构算法,建立一种添加黏合物质和施加不均匀压缩的GDL建模方法;然后利用格子玻尔兹曼数值仿真气体单相流动,研究黏合物质与压缩形变对燃料电池GDL孔隙结构和气体渗透特性的影响规律.计算结果表明:黏合物质与压缩形变均会导致气体扩散小尺寸孔隙结构占比增大,整体孔隙率减小;GDL的渗透率变化趋势与孔隙率一致,均降低,变化规律基本符合理论预测关系;当孔隙率相近时,压缩变形是导致的渗透率降低的关键因素. 展开更多
关键词 气体扩散层 黏合物质 压缩变形 孔隙结构 渗透率
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Effect of Short Chain Alcohols upon Viscosity of TTAB Solution 被引量:1
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作者 Yun-fei Yan Hua-zhen Li +3 位作者 Hai-yang Yang Jia-sheng Qian Ping-ping Zhu Ping-sheng He 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 北大核心 2008年第2期169-173,共5页
The effect of ethanol (C2H5OH), propanol (C3H7OH), and butanol (C4H9OH) upon the viscosity of tetradecyltrimethylammonium bromide (TTAB) solution in the presence or absence of KBr at 30℃was investigated, wher... The effect of ethanol (C2H5OH), propanol (C3H7OH), and butanol (C4H9OH) upon the viscosity of tetradecyltrimethylammonium bromide (TTAB) solution in the presence or absence of KBr at 30℃was investigated, where the surfactant concentration CS is kept constant. In the absence of KBr, the relative viscosity ηr of TTAB solution increases linearly with the alcohol concentration CA, indicating that the alcohols do not promote micelle formation of TTAB. In the presence of KBr, ηr linearly decreases with CA for C2H5OH, but it exhibits a maximum with increasing CA for C3H7OH or C4H9OH. The facts reveal that C2H5OH or C4H9OH promotes the micelle formation of TTAB. A possible explanation is that the hydrophobicity of the mieellar interior is enhanced by KBr, so that C2H5OH or C4H9OH can dissolve in micelle and promotes micelle formation. In the presence of KCl, which is less efficient in promoting the micelle formation of cationic surfactant, both C3H7OH and C4H9OH have only a slight effect on the micelle formation. In contrast, due to the hydrophilicity, C2H5OH cannot dissolve in micelles in the presence of KBr or KCl. 展开更多
关键词 Relative viscosity Cationic surfactant Organic additive Hydrophobic interaction
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