多孔超疏水膜：振荡流中的流体动力学异常
Porous Superhydrophobic Membranes: Hydrodynamic Anomaly in Oscillating Flows
摘要：
我们已经制造和表征了一种新的超疏水系统，一个网状多孔超疏水膜与固体面积分数$Φ_s$，它可以保持与外部空气和水的水库同时密切接触。对多孔超疏水膜的振荡流体动力学测量作为$Φ_s$的函数揭示了令人惊讶的效果。与膜同相振荡的流体动力学质量对于$0.9\leΦ_s\le1$保持恒定，但对于$Φ_s < 0.9$急剧下降。粘性摩擦在与$Φ_s$成比例的缓慢初始降低之后显示出类似的下降。我们将这些效应归因于界面处稳定的Knudsen空气层的渗透。
英文摘要：
We have fabricated and characterized a novel superhydrophobic system, a mesh-like porous superhydrophobic membrane with solid area fraction $Φ_s$, which can maintain intimate contact with outside air and water reservoirs simultaneously. Oscillatory hydrodynamic measurements on porous superhydrophobic membranes as a function of $Φ_s$ reveal surprising effects. The hydrodynamic mass oscillating in-phase with the membranes stays constant for $0.9\leΦ_s\le1$, but drops precipitously for $Φ_s < 0.9$. The viscous friction shows a similar drop after a slow initial decrease proportional to $Φ_s$. We attribute these effects to the percolation of a stable Knudsen layer of air at the interface.
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