Two-phase Flow in Fuel Cells in Short-term Microgravity Condition

被引：28

作者：

Guo, Hang ^{[1
,2
]}

Zhao, Jian Fu ^{[3
]}

Ye, Fang ^{[1
,2
]}

Wu, Feng ^{[1
,2
]}

Lv, Cui Ping ^{[1
,2
]}

Ma, Chong Fang ^{[1
,2
]}

机构：

[1] Beijing Univ Technol, Coll Environm & Energy Engn, Minist Educ, Key Lab Enhanced Heat Transfer & Energy Conservat, Beijing 100124, Peoples R China

[2] Beijing Univ Technol, Key Lab Heat Transfer & Energy Convers, Beijing 100124, Peoples R China

[3] Chinese Acad Sci, Inst Mech, Beijing 100080, Peoples R China

来源：

MICROGRAVITY SCIENCE AND TECHNOLOGY | 2008年 / 20卷 / 3-4期

基金：

中国国家自然科学基金;

关键词：

Fuel cells; Two-phase flow; Microgravity;

D O I：

10.1007/s12217-008-9038-z

中图分类号：

V [航空、航天];

学科分类号：

08 [工学]; 0825 [航空宇航科学与技术];

摘要：

A visual observation of liquid-gas two-phase flow in anode channels of a direct methanol proton exchange membrane fuel cells in microgravity has been carried out in a drop tower. The anode flow bed consisted of 2 manifolds and 11 parallel straight channels. The length, width and depth of single channel with rectangular cross section was 48.0 mm, 2.5 mm and 2.0 mm, respectively. The experimental results indicated that the size of bubbles in microgravity condition is bigger than that in normal gravity. The longer the time, the bigger the bubbles. The velocity of bubbles rising is slower than that in normal gravity because buoyancy lift is very weak in microgravity. The flow pattern in anode channels could change from bubbly flow in normal gravity to slug flow in microgravity. The gas slugs blocked supply of reactants from channels to anode catalyst layer through gas diffusion layer. When the weakened mass transfer causes concentration polarization, the output performance of fuel cells declines.

引用

页码：265 / 269

页数：5

共 23 条

[1]

Gas evolution and power performance in direct methanol fuel cells [J].