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Near-field laser Doppler velocimetry measures near-wall velocities

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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.

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Authors and Affiliations

  1. Foundation for Research and Technology Hellas, IESL, 71110, Heraklion, Greece

    B. Loppinet

  2. Forschungszentrum Jülich, ICS-3, 52425, Jülich, Germany

    J. K. G. Dhont & P. Lang

Authors
  1. B. Loppinet
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  2. J. K. G. Dhont
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  3. P. Lang
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Correspondence to B. Loppinet.

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Loppinet, B., Dhont, J.K.G. & Lang, P. Near-field laser Doppler velocimetry measures near-wall velocities. Eur. Phys. J. E 35, 62 (2012). https://doi.org/10.1140/epje/i2012-12062-5

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  • DOI: https://doi.org/10.1140/epje/i2012-12062-5

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