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Experimental study of the effect of particle–wall interactions on inertial particle dynamics in wall turbulence

Published online by Cambridge University Press:  26 March 2024

G.H. Wang Open the ORCID record for G.H. Wang [Opens in a new window] ,
W.B. Chen Open the ORCID record for W.B. Chen [Opens in a new window]  and
X.J. Zheng Open the ORCID record for X.J. Zheng [Opens in a new window]
G.H. Wang
Affiliation:
Center for Particle-Laden Turbulence, Lanzhou University, Lanzhou 730000, PR China
W.B. Chen
Affiliation:
Center for Particle-Laden Turbulence, Lanzhou University, Lanzhou 730000, PR China
X.J. Zheng*
Affiliation:
Research Center for Applied Mechanics, Xidian University, Xi'an 710071, PR China
*
†Email address for correspondence: xjzheng@lzu.edu.cn
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Abstract

Based on Voronoi analysis, the properties related to the near-wall motion of particles in a turbulent boundary layer were experimentally investigated via different release modes, with a friction Reynolds number $Re_\tau =3530$. For high-inertia sand particles with Stokes number $St^+ \sim O(10^2\unicode{x2013}10^3)$ and a volume fraction $\varPhi _v \sim O(10^{-4})$, particle image tracking velocimetry was used to determine the particle position and near-wall distribution properties. We established three particle release modes, including top-released, bottom overall-released and bottom partially released sand particles, under the same flow field conditions and calculated the differences in particle near-wall clustering and void properties. It was confirmed that wall effects (including collision and strike-splash) have a great influence on particle clustering and void behaviour near the wall. In the top-released sand particle and locally laid sand particle cases, particles bounced off the smooth walls and re-entered the carrier flow, causing significant clustering and sparsing of particles near the walls. In contrast, in the overall sand-laying case where the bottom wall was completely covered with sand particles, there is no apparent cluster or void phenomenon near the wall $(z/\delta <0.12)$ and the particles are randomly distributed, due to the combined effect of particle impact and splashing. In addition, the clustering and voids of particles become more pronounced with increasing wall-normal distance in the three release modes, and the particle distribution shows some self-similarity at each flow layer. The probability density function of the concentration of cluster particles decreases following a ‘$-5/3$’ power law. However, due to the particle–wall interaction, the probability density function gradually deviates from the ‘$-5/3$’ power law.

JFM classification

Multiphase and Particle-laden Flows: Particle/fluid flow Turbulent Flows: Turbulent boundary layers
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 984 , 10 April 2024 , A4
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Copyright
© The Author(s), 2024. Published by Cambridge University Press

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