Hostname: page-component-7c8c6479df-27gpq Total loading time: 0 Render date: 2024-03-28T21:25:25.993Z Has data issue: false hasContentIssue false

Direct measurement of slip velocities using three-dimensional total internal reflection velocimetry

Published online by Cambridge University Press:  05 October 2006

PETER HUANG
Affiliation:
Division of Engineering, Brown University, Providence, RI 02915, USA
JEFFREY S. GUASTO
Affiliation:
Division of Engineering, Brown University, Providence, RI 02915, USA
KENNETH S. BREUER
Affiliation:
Division of Engineering, Brown University, Providence, RI 02915, USA

Abstract

The existence and magnitude of slip velocities between deionized water and a smooth glass surface is studied experimentally. Sub-micron fluorescent particles are suspended in water and imaged using total internal reflection velocimetry (TIRV). For water flowing over a hydrophilic surface, the measurements are in agreement with previous experiments and indicate that slip, if present, is minimal at low shear rates, but increases slightly as the shear rate increases. Surface hydrophobicity is observed to induce a small slip velocity, with the slip length reaching a maximum of 96 nm at a shear rate of 1800$\,{\rm s}^{-1}$. Issues associated with the experimental technique and the interpretation of results are also discussed.

Type
Papers
Copyright
© 2006 Cambridge University Press

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)