Experimental results on pressure drop and flow patterns for gas–liquid flow through packed beds obtained in the International Space Station with two types of packing are presented and analyzed. It is found that the pressure drop depends on the packing wettability in the viscous–capillary (V–C) regime and this dependence is compared with previously published results developed using short duration low‐gravity aircraft tests. Within the V–C regime, the capillary contribution is the dominant force contributing to the pressure drop for the wetting case (glass) versus the viscous contribution dominating for the non‐wetting case (Teflon). Outside of the V–C regime, it is also found that hysteresis effects that are often strong in normal gravity gas–liquid flows are greatly diminished in microgravity and pressure drop is nearly independent of packing wettability. A flow pattern transition map from bubble to pulse flow is also compared with the earlier aircraft data.

中文翻译：

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气液流经微重力的多孔介质：国际空间站填充床反应器实验

提出并分析了在国际空间站中使用两种填料的流经填料床的气液流的压降和流动方式的实验结果。发现压降取决于粘性-毛细管（V-C）情况下的填料润湿性，并将这种依赖性与先前发表的使用短时低重力飞行器试验得出的结果进行了比较。在V–C模式下，毛细管作用是在润湿情况下（玻璃）引起压降的主导力，而在非润湿情况下（聚四氟乙烯）则是粘性作用的主导力。在V–C体制之外，还发现，在重力重力作用下，滞回效应在微重力作用下通常会大大减弱，而压降几乎与填料的润湿性无关。从气泡到脉冲流的流型过渡图也与早期的飞机数据进行了比较。