燃料电池部分堵塞通道内液滴的动态行为

Dynamic behavior of droplets in partially blocked channels of fuel cell

为了有效去除通道内液态水,采用流体体积模型(volume of fluid model,VOF)方法研究了燃料电池通道内部分堵塞对液滴运输过程的影响,探讨了堵塞块形状参数、液滴尺寸和气体扩散层(gas diffusion layer,GDL)表面润湿性对通道内两相输运特性的影响.结果表明:堵塞块的存在会影响液滴在通道内运输,堵塞块的引入导致液滴受到y方向的剪切力增大,液滴的运输速率提高,有利于GDL表面液态水的去除;随着堵塞比和纵向比的增大,通道内压降增大,液滴运输速率加快;随着液滴直径和GDL表面接触角的增大,液滴运输速率增大;当液滴直径为0.8 cm和GDL表面接触角为150°时,通道内液滴的运输速率越快.

To effectively remove liquid water in the channel,the effect of partial blockage in the fuel cell channel on the droplet transport process was investigated by the volume of fluid model(VOF) method,and the effects of blockage block shape parameters,droplet size and gas diffusion layer(GDL) surface wettability on the two-phase transport characteristics in the channel were explored.The results show that the presence of block affects the droplet transport in the channel.The introduction of block can increase the droplet shear force in the y direction,which increases the droplet transport rate and facilitates the removal of liquid water from the GDL surface.As the blocking ratio and longitudinal ratio increase,the pressure drop in the channel is increased,and the droplet transport rate is accelerated.With the increasing of droplet diameter and contact angle of GDL surface,the droplet transport rate is increased.When the droplet diameter is 0.8 cm with the GDL surface contact angle of 150°,the droplet transport rate in the channel is fast.