Modulation of turbulence intensity by heavy finite-size particles in upward channel flow

Yu, Zhaosheng; Xia, Yan; Guo, Yu; Lin, Jianzhong

doi:10.1017/jfm.2020.1140

Cited by 44 publications

(62 citation statements)

References 104 publications

(158 reference statements)

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“…Such a ranking agrees with the conventional idea that the higher the particle concentration, the more the turbulence attenuates (Yu et al. 2021). To our understanding, this can be interpreted in another way: particle clusters are prone to be formed in flow regions with low momentum and weak turbulent fluctuation.…”

Section: Effects Of Particle Clusters On Fluid-phase Kinematicssupporting

confidence: 89%

Attached eddy-like particle clustering in a turbulent boundary layer under net sedimentation conditions

et al. 2021

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Section: Effects Of Particle Clusters On Fluid-phase Kinematicssupporting

confidence: 89%

Attached eddy-like particle clustering in a turbulent boundary layer under net sedimentation conditions

et al. 2021

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“…These contributions are related to the stress profiles via the Fukagata, Iwamoto and Kasagi (FIK) identity (see Fukagata, Iwamoto & Kasagi 2002; Yu et al. 2021), with the contribution of each stress mechanism given by the following weighted integral: . Expectedly, the stress budget pertaining to case VD resembles that of the single-phase flow, with negligible contribution from the particles.…”

Section: Resultsmentioning

confidence: 99%

“…2002; Yu et al. 2021), with the different contributions, and the wall friction velocity of the unladen case.…”

Section: Resultsmentioning

confidence: 99%

Near-wall turbulence modulation by small inertial particles

Costa¹,

Brandt²,

Picano³

2021

J. Fluid Mech.

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“…In Fig. 6(d) we present contribution of each stress τ i to the skin friction coefficient c f using the FIK (Fukagata, Iwamoto, and Kasagi) identity [61,62]. The normalized contribution can be expressed as c f i = 1 0 6(1 − z)τ i dz.…”

Section: A Effects Of Surfactantmentioning

confidence: 99%

Polymer drag reduction in surfactant-contaminated turbulent bubbly channel flows

et al. 2021

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Polymer additives are commonly utilized to manipulate bubbly flows in various applications. Here we investigate the effects of clean and contaminated bubbles driven upward (upflow) in Newtonian and viscoelastic turbulent channel flows. Interface-resolved direct numerical simulations are performed to examine sole and combined effects of soluble surfactant and viscoelasticity using an efficient three-dimensional finite-difference-fronttracking method. The incompressible flow equations are solved fully coupled with the FENE-P viscoelastic model and the equations governing interfacial and bulk surfactant concentrations. The latter coupling is accomplished by a nonlinear equation of state that relates the surface tension to the surfactant concentration. For Newtonian turbulent bubbly flows, the effects of Triton X-100 and 1-pentanol surfactant are examined. It is observed that the sorption kinetics highly affect the dynamics of bubbly flow. A minute amount of Triton X-100 is found to be sufficient to prevent the formation of bubble clusters restoring the single-phase behavior while even two orders of magnitude more 1-pentanol surfactant is not adequate to prevent the formation of layers. For viscoelastic turbulent flows, it is found that the viscoelasticity promotes formation of the bubble wall-layers and thus the polymer drag reduction is completely lost for the surfactant-free bubbly flows, while the addition of small amount of surfactant (Triton X-100) in this system restores the polymer drag reduction resulting in 25% drag reduction for the Wi = 4 case.

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Modulation of turbulence intensity by heavy finite-size particles in upward channel flow

Abstract: Abstract

Cited by 44 publications

References 104 publications

Attached eddy-like particle clustering in a turbulent boundary layer under net sedimentation conditions

Attached eddy-like particle clustering in a turbulent boundary layer under net sedimentation conditions

Near-wall turbulence modulation by small inertial particles

Polymer drag reduction in surfactant-contaminated turbulent bubbly channel flows

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