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On the existence and formation of multi-scale particle streaks in turbulent channel flows

Published online by Cambridge University Press:  26 January 2022

Yucheng Jie Open the ORCID record for Yucheng Jie [Opens in a new window] ,
Zhiwen Cui Open the ORCID record for Zhiwen Cui [Opens in a new window] ,
Chunxiao Xu Open the ORCID record for Chunxiao Xu [Opens in a new window]  and
Lihao Zhao Open the ORCID record for Lihao Zhao [Opens in a new window]
Yucheng Jie
Affiliation:
AML, Department of Engineering Mechanics, Tsinghua University, 100084 Beijing, PR China
Zhiwen Cui
Affiliation:
AML, Department of Engineering Mechanics, Tsinghua University, 100084 Beijing, PR China
Chunxiao Xu
Affiliation:
AML, Department of Engineering Mechanics, Tsinghua University, 100084 Beijing, PR China
Lihao Zhao*
Affiliation:
AML, Department of Engineering Mechanics, Tsinghua University, 100084 Beijing, PR China
*
†Email address for correspondence: zhaolihao@tsinghua.edu.cn
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Abstract

Direct numerical simulations of particle-laden turbulent channel flows at friction Reynolds number $Re_\tau$ from $600$ to $2000$ have been performed to examine the near-wall particle streaks. Different from the well-observed small-scale particle streaks in near-wall turbulence of low $Re_\tau$, the present results show large-scale particle streaks through the computational domain formed for relatively high-inertia particles at high $Re_\tau$. Transferred by large-scale sweep and ejection events ($Q^-$), these high-inertia particles preferentially accumulate in near-wall regions beneath the large-scale low-speed flow streaks observed in the logarithmic region. The corresponding Stokes numbers are associated with the lifetime of large-scale $Q^-$ structures, which increases as the Reynolds number grows. The small-scale particle streaks with a typical Stokes number $St_\nu \approx 30$ are mainly driven by the $Q^-$ structures in the buffer layer, whose lifetime is approximately $30$ in viscous time unit. Therefore, we propose a new structure-based Stokes number normalized by the lifetime of $Q^-$ structures of different scales. The relevant flow scales that control the formation of the large-scale particle streaks are parameterized by the structure-based Stokes number. The small-scale (large-scale) particle streaks are most prominent when the buffer-layer (large-scale) structure-based Stokes number approaches unity. The present findings reveal that formation of near-wall particle streaks is governed by the $Q^-$ structures of different scales, and the particles with different inertia respond efficiently to the $Q^-$ structures of corresponding scales with respect to the particle translational motion.

JFM classification

Complex Fluids: Suspensions Multiphase and Particle-laden Flows: Particle/fluid flow Turbulent Flows: Turbulence simulation

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Type
JFM Papers
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Journal of Fluid Mechanics , Volume 935 , 25 March 2022 , A18
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© The Author(s), 2022. Published by Cambridge University Press

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