The effect of surface character on flows in microchannels

Lucy E Rodd; Shane T Huntington; Katja Lyytikainen; David V. Boger; Justin J Cooper-White

doi:10.1117/12.530223

29 March 2004 The effect of surface character on flows in microchannels

Lucy E Rodd, Shane T Huntington, Katja Lyytikainen, David V. Boger, Justin J Cooper-White

Proceedings Volume 5275, BioMEMS and Nanotechnology; (2004) https://doi.org/10.1117/12.530223
Event: Microelectronics, MEMS, and Nanotechnology, 2003, Perth, Australia

Abstract

A technique for quantifying velocity profiles of fluids flowing in circular microchannels is presented. The primary purpose of this technique is to provide a robust method for quantifying the effect of surface character on the bulk fluid behaviour. A laser-scanning confocal microscope has been used to obtain fluorescent particle images from a 1 micron thick plane along the centreline of hydrophobic and hydrophilic glass capillaries. The velocities of fluorescent particles being carried in pressure-driven laminar flow of a Newtonian fluid have been evaluated at the centreplane of 57.5 micron capillaries using a variation of particle tracking velocimetry (PTV). This work aims to clarify inconsistencies in previously reported [1-12] slip velocities observed in water over hydrophobically modified surfaces at micron and sub-micron lengthscales. A change in the velocity profile is observed for water flowing in hydrophobic capillaries, although the behaviour appears to be a result of an optical distortion at the fluid-wall interface. This may point to previous suggestions of a thin layer of air adsorbing to the surface. Notwithstanding, the results do not confidently suggest evidence of slip of water on hydrophobic surfaces in microchannels.

Citation Download Citation

Lucy E Rodd, Shane T Huntington, Katja Lyytikainen, David V. Boger, and Justin J Cooper-White "The effect of surface character on flows in microchannels", Proc. SPIE 5275, BioMEMS and Nanotechnology, (29 March 2004); https://doi.org/10.1117/12.530223

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available