The interaction between an air-driven, wall-bound drop and a groove in the wall of a channel flow has been investigated experimentally using a high-speed video system. Three major outcomes of drop interaction with the groove are observed: (i) the drop passes over the groove, (ii) the drop is immediately fully captured in the groove or (iii) the drop is captured after first wetting the rear side of the groove. The mechanisms leading to these different outcomes are governed by the aerodynamic drag force, by inertial and gravity forces, and by the adhesion force associated with the substrate wettability. A threshold condition for drop capture is developed, based on the ratio of the typical time for drop passage over the groove to the time for the drop to be sucked into the groove. It has been shown that the probability for drop capture increases for higher Bond numbers.

气动驱动的壁降液滴与通道流壁中的凹槽之间的相互作用已使用高速视频系统进行了实验研究。观察到液滴与凹槽相互作用的三个主要结果：（i）液滴通过凹槽，（ii）液滴立即被完全捕获在凹槽中，或（iii）液滴首先润湿后部后被捕获。槽。导致这些不同结果的机制由气动阻力，惯性和重力以及与基材润湿性相关的粘附力控制。基于液滴在凹槽上通过的典型时间与液滴被吸入凹槽中的时间之比，得出了液滴捕获的阈值条件。