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Evidence of slippage breakdown for a superhydrophobic microchannel

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posted on 22.06.2017, 11:03 by Guido BolognesiGuido Bolognesi, C. Cottin-Bizonne, C. Pirat
© 2014 AIP Publishing LLC.A full characterization of the water flow past a silicon superhydrophobic surface with longitudinal micro-grooves enclosed in a microfluidic device is presented. Fluorescence microscopy images of the flow seeded with fluorescent passive tracers were digitally processed to measure both the velocity field and the position and shape of the liquid-air interfaces at the superhydrophobic surface. The simultaneous access to the meniscus and velocity profiles allows us to put under a strict test the no-shear boundary condition at the liquid-air interface. Surprisingly, our measurements show that air pockets in the surface cavities can sustain non-zero interfacial shear stresses, thereby hampering the friction reduction capabilities of the surface. The effects of the meniscus position and shape as well as of the liquid-air interfacial friction on the surface performances are separately assessed and quantified.

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Chemical Engineering

Published in

Physics of Fluids

Volume

26

Issue

8

Citation

BOLOGNESI, G., COTTIN-BIZONNE, C. and PIRAT, C., 2014. Evidence of slippage breakdown for a superhydrophobic microchannel. Physics of Fluids, 26: 082004.

Publisher

© American Insitute of Physics (AIP)

Version

VoR (Version of Record)

Publication date

2014-08-13

Notes

This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. The following article appeared in BOLOGNESI, G., COTTIN-BIZONNE, C. and PIRAT, C., 2014. Evidence of slippage breakdown for a superhydrophobic microchannel. Physics of Fluids, 26: 082004. and may be found at http://dx.doi.org/10.1063/1.4892082

ISSN

1070-6631

eISSN

1089-7666

Language

en

Article number

082004

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