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