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Reduced pressure is able to affect captive bubbles collectively rather than individually. The depressurization and repressurization of a submerged superhydrophobic (SH) surface was found here to produce a captive bubble that exhibited height changes but invariant contact angles and contact lines. In some instances during depressurization, the initial nucleated captive bubble could be smaller in volume,...
The movement behavior of glycerol–water mixtures as sessile drops on a tilted PTFE incline is investigated here. The slip angles found showed complex relationships in relation to the mixture composition. Since the drop was found to breach its front contact line first, the levels of contact angle hysteresis did not have corresponding trends with the slip angles. However, the ratios of the drop lengths...
The ability of uphill droplet transport on a superhydrophobic surface incline using airflow was demonstrated. Analytical equations were found to describe the droplet volume at detachment at various inclination angles for the range of physical parameters applied. A pinching off behavior with necking prior to detachment was observed in which a constant time to rupture of 3.2×10−2s from a neck thickness...
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