Porous Superhydrophobic Membranes: Hydrodynamic Anomaly in Oscillating Flows

Details Porous Superhydrophobic Membranes: Hydrodynamic Anomaly in Oscillating Flows Porous Superhydrophobic Membranes: Hydrodynamic Anomaly in Oscillating Flows

2011-07-29

arxiv.org/abs/1107.5873v2

Phys. Rev. Lett. 107, 174501 (2011)

Physics

Condensed Matter

Soft Condensed Matter

5 pages, 3 figures

Scientific paper

We have fabricated and characterized a novel superhydrophobic system, a mesh-like porous superhydrophobic membrane with solid area fraction $\Phi_s$, which can maintain intimate contact with outside air and water reservoirs simultaneously. Oscillatory hydrodynamic measurements on porous superhydrophobic membranes as a function of $\Phi_s$ reveal surprising effects. The hydrodynamic mass oscillating in-phase with the membranes stays constant for $0.9\le\Phi_s\le1$, but drops precipitously for $\Phi_s < 0.9$. The viscous friction shows a similar drop after a slow initial decrease proportional to $\Phi_s$. We attribute these effects to the percolation of a stable Knudsen layer of air at the interface.

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