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Water slip and friction at a solid surface

By Laura Brigo, M Natali, MATTEO AMBROGIO PAOLO Pierno, Fabio Mammano, Cinzia Sada, G Fois, A Pozzato, S. DAL ZILIO, M Tormen and Giampaolo Mistura

Abstract

A versatile micro- particle imaging velocimetry ( mu- PIV) recording system is described, which allows us to make fluid velocity measurements in a wide range of flow conditions both inside microchannels and at liquid - solid interfaces by using epifluorescence and total internal reflection fluorescence excitation. This set- up has been applied to study the slippage of water over flat surfaces characterized by different degrees of hydrophobicity and the effects that a grooved surface has on the fluid flow inside a microchannel. Preliminary measurements of the slip length of water past various flat surfaces show no significant dependence on the contact angle

Topics: MICROFLUIDICS, MICROCHANNELS, FLOW
Publisher: 'IOP Publishing'
Year: 2008
DOI identifier: 10.1088/0953-8984/20/35/354016
OAI identifier: oai:www.research.unipd.it:11577/2512727
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