Near-field laser Doppler velocimetry measures near-wall velocities

Regular Article

Abstract

A new near-wall velocimetry technique is proposed, based on evanescent wave dynamic light scattering, which allows for the measurement of near-wall velocity profile (characterized by an apparent slip velocity and a shear rate) with a resolution of tens of nanometers. A full theoretical expression of the correlation function is derived for the case of linear flow with negligible Brownian motion. The technique is demonstrated for latex spheres dispersed in water-glycerol mixtures.

Keywords

Soft Matter: Interfacial Phenomena and Nanostructured Surfaces 

Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  1. 1.Foundation for Research and Technology HellasIESLHeraklionGreece
  2. 2.Forschungszentrum Jülich, ICS-3JülichGermany

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