Since the Gas Diffusion Layer (GDL) clearance and the residence time of produced water in gas channels remarkably affect the proper operation of proton exchange membrane (PEM) Fuel Cells, the water management in this part plays a key role. To this end, the present study aims to introduce novel and optimized gas channels through geometrical modifications that act efficiently in terms of GDL clearance and liquid residence time. For this purpose, the VOF (Volume of Fluid) model was employed to numerically simulate two-phase flow by means of a finite volume method. Several decisive parameters including superficial gas velocity, channel surface wettability, and channel cross-section geometry were considered to find their effects on the liquid removal behavior. The liquid removal performance was analyzed by two-phase pressure drop, area coverage ratio (ACR), and liquid removal time. Results have been compared with previous works done on the conventional rectangular channels. Interestingly, it was found out that for the analyzed segment of the gas flow channels, the channel with triangle cross-section has superior performance in reducing ACR by 64% for inlet superficial air velocity of 0.5 $\raisebox{1ex}{$m$}\!\left/ \!\raisebox{-1ex}{$s$}\right.$ and 8–24.45% reduction for higher velocities (1, 1.5 and 2.5 $\raisebox{1ex}{$m$}\!\left/ \!\raisebox{-1ex}{$s$}\right.$). Also, the transition from slug flow to film flow also stable two-phase pressure drop were only seen in this type of channel. The ranking of channels based on their residence time merit is as: hexagon > pentagon > rectangular > triangle. Increment of the contact angle of hydrophilic walls causes fluctuations in the two-phase pressure drop and decreases liquid water residence time. For triangle channel, surface with a contact angle of ${\sim 120}^{°}$ and for the hexagon and pentagon channels 85–120° is suggested for the best fuel cell performance.

由于气体扩散层（GDL）的清除率和采出水在气体通道中的停留时间会显着影响质子交换膜（PEM）燃料电池的正常运行，因此该部分的水管理起着关键作用。为此，本研究旨在通过几何修饰引入新颖且优化的气体通道，这些修饰在GDL清除率和液体停留时间方面有效发挥作用。为此，采用VOF（流体体积）模型通过有限体积法对两相流动进行数值模拟。考虑了几个决定性参数，包括表观气体速度，通道表面润湿性和通道横截面几何形状，以发现它们对液体去除行为的影响。通过两相压降分析除液性能，面积覆盖率（ACR）和液体去除时间。将结果与以前在常规矩形通道上所做的工作进行了比较。有趣的是，发现对于气流通道的分析部分，具有三角形横截面的通道在进气表观空气速度为0.5时，具有将ACR降低64％的优异性能。$\raisebox{1ex}{$米$}\!\left/ \!\raisebox{-1ex}{$s$}\right.$ 降低8–24.45％以获得更高的速度（1、1.5和2.5 $\raisebox{1ex}{$米$}\!\left/ \!\raisebox{-1ex}{$s$}\right.$）。同样，从团状流到膜流的过渡以及稳定的两相压降仅在这种类型的通道中可见。基于通道停留时间优点的通道排名为：六边形 > 五边形 > 矩形 > 三角形。亲水壁接触角的增加会引起两相压降的波动，并减少液态水的停留时间。对于三角形通道，接触角为${〜120}^{°}$ 对于六角形和五边形通道，建议使用85–120°以获得最佳的燃料电池性能。