摘要
以质子交换膜燃料电池流道中的液滴为研究对象,考虑了吹力、重力以及粘滞力的影响,从力平衡的角度出发建立了液滴从扩散层表面脱离的临界风速及半径的关系,得出了不同的重力倾角和工作压力对临界风速的影响。研究表明:在水平流道中,临界风速受温度的影响不大,而随工作压力的增大而减小;增大重力倾角有利于提高电堆的排水能力;小液滴脱离的临界风速受工作压力的影响较大,而处于自发脱离半径区的液滴,工作压力的影响已不再明显。
Dealing with a droplet on the flow channel of PEMFC,a mathematical model based on the force balance of the flow force,gravity and hysteresis tension was derived to address the expressions of the critical airflow velocity and the droplet radii.The results showed that in the horizontal flow channel,the critical airflow velocity was hardly affected by the working temperature but decreased with the increasing of operation pressure.The droplet removal capability could be enhanced by increasing the tilt angle of the cell.For a small droplet,the operation pressure had an apparent effect on the airflow velocity,while for a droplet in the spontaneous departure area,this effect could be neglected.
出处
《电池工业》
CAS
2011年第2期93-96,共4页
Chinese Battery Industry
基金
国家"863"重大项目(2008AA11A106)
中国博士后科学基金(No.20100471165)
国家自然科学基金(No.208761215090602650876035)
关键词
PEMFC
流道
重力
液滴
临界风速
PEMFC
flow channel
gravity
droplet
critical velocity
作者简介
涂正凯（1981-），男，博士；主要从事质子交换膜燃料电池传热传质的研究。
