Porous Superhydrophobic Membranes: Hydrodynamic Anomaly in Oscillating Flows
| Autor: | Rajauria, Sukumar, Ozsun, O., Lawall, J., Yakhot, Victor, Ekinci, Kamil L. |
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| Rok vydání: | 2011 |
| Předmět: | |
| Zdroj: | Phys. Rev. Lett. 107, 174501 (2011) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevLett.107.174501 |
| Popis: | 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. Comment: 5 pages, 3 figures |
| Databáze: | arXiv |
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