Phase separation in space is critical for gas-free propellant supply, life support systems, refueling of spacecraft in low earth orbit (LEO), and for deep space exploration missions. In the absence of gravity, the stability of the liquid-gas interface depends on capillary forces. High liquid flow rates, sudden accelerations, and vibrational disturbances can cause the free surface of the liquid to collapse, which results in the ingestion of gas. Propellant tanks may have screen channel liquid acquisition devices (SCLADs) to position and maintain a gas-free propellant supply to the outlet. A saturated porous screen permits liquid to pass through but acts as a barrier to the gas. We investigated phase separation in porous media integrated capillary channels during parabolic flights (33^rd DLR parabolic flight campaign in March 2019). An open side of a rectangular channel was covered with a dutch twill weave 200×1400. The liquid was ingested into the channel from its surroundings by establishing a differential pressure across the screen section. The gas-phase was blocked during the liquid withdrawal. We could show that the gas breakthrough occurs when the pressure difference across the screen exceeds the bubble point pressure. The experimental results showed good agreement with correlations from literature.

空间中的相分离对于无气体推进剂供应，生命支持系统，低地球轨道（LEO）中的航天器加油以及深空探索任务至关重要。在没有重力的情况下，液-气界面的稳定性取决于毛细作用力。较高的液体流速，突然的加速度和振动干扰会导致液体的自由表面塌陷，从而导致气体被吸入。推进剂罐可能具有筛分通道液体采集装置（SCLAD），以定位并维持向出口的无气推进剂供应。饱和的多孔滤网允许液体通过，但充当气体的屏障。我们在期间抛物线飞行集成毛细通道多孔介质研究的相分离（33^次DLR抛物线飞行运动（2019年3月）。矩形通道的开放侧覆盖有200×1400的荷兰斜纹编织。通过在滤网部分上建立压差，将液体从其周围环境吸入通道中。在液体排出期间气相被阻塞。我们可以证明，当滤网两端的压差超过泡点压力时，就会发生气体突破。实验结果表明与文献相关性良好。