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The effects of hindered mobility and depletion of particles in near-wall shear flows and the implications for nanovelocimetry

Published online by Cambridge University Press:  17 September 2009

PETER HUANG ,
JEFFREY S. GUASTO  and
KENNETH S. BREUER
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
*
†Present address: Department of Mechanical Engineering, Binghamton University, Binghamton, NY 13902, USA. Email address for correspondence: phuang@binghamton.edu
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Abstract

The behaviour of spherical Brownian particles in a near-wall shear flow is explored using Langevin simulations and experimental measurements, focusing on the effects of anisotropic hindered particle mobility and the formation of a particle depletion layer due to repulsive forces. The results are discussed in the context of particle velocity distributions obtained by near-wall image-based velocimetry. It is observed that the shear force and dispersion dominate at high Péclet number (Pe > 3), and the asymmetric shapes of particle velocity distributions are attributed to broken symmetry due to the presence of the wall. Furthermore, the excursions outside the observation depth between image acquisitions and the shear-induced slowdowns of tracer particles cause significant measurement bias for long and short inter-frame time intervals, respectively. Also impeding the measurement accuracy is the existence of a near-wall particle depletion layer that leads to an overestimation of the fluid velocity. An analytical protocol to infer the correct fluid velocity from biased measurements is presented.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 637 , 25 October 2009 , pp. 241 - 265
Copyright
Copyright © Cambridge University Press 2009

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