Deagglomeration of cohesive particles by turbulence

Yao, Yuan; Capecelatro, Jesse

doi:10.1017/jfm.2020.1020

Cited by 20 publications

(20 citation statements)

References 73 publications

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“…As analysed in Appendix A, the Tabor parameter is quite small in the present simulations, , which indicates that the present modelling framework is appropriate. This is also consistent with the findings of Yao & Capecelatro (2021), who demonstrated that the additive adhesion/collision modelling framework is valid when the Tabor parameter .…”

Section: Physical and Computational Modelsupporting

confidence: 92%

“…(2019) described the equilibrium separation as . Yao & Capecelatro (2021) expressed the surface energy of the particle as . Marshall & Li (2014) defined the length . As shown in table 1, the particle diameter in the present simulations is fixed, and the range of the Hamaker constant is , yielding the range of the surface energy .…”

Section: Tablementioning

confidence: 99%

“…Consequently, the one-way coupled Taylor-Green flow provides an efficient approach for analysing the formation of moderate-size flocs in turbulence. We expect that two-way coupled simulations will be required for analysing the dynamics of very large flocs (Yao & Capecelatro 2021).…”

Section: Comparison Of Flocculation Dynamics In One-way and Two-way C...mentioning

confidence: 99%

“…(2019) described the equilibrium separation as . Yao & Capecelatro (2021) expressed the surface energy of the particle as . Marshall & Li (2014) defined the length .…”

Section: Tablementioning

confidence: 99%

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Cohesive sediment: intermediate shear produces maximum aggregate size

et al. 2023

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We interpret the Taylor–Green cellular vortex model in terms of the Kolmogorov length and velocity scales, in order to study the balance between aggregation and breakup of cohesive sediment in fine-scale turbulence. One-way coupled numerical simulations, which capture the effects of cohesive, lubrication and direct contact forces on the flocculation process, reproduce the non-monotonic relationship between the equilibrium floc size and shear rate observed in previous experiments. The one-way coupled results are confirmed by select two-way coupled simulations. Intermediate shear gives rise to the largest flocs, as it promotes preferential concentration of the primary particles without generating sufficiently strong turbulent stresses to break up the emerging aggregates. We find that the optimal intermediate shear rate increases for stronger cohesion and smaller particle-to-fluid density ratios, and we propose a simple model for the equilibrium floc size that agrees well with experimental data reported in the literature.

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Section: Physical and Computational Modelsupporting

confidence: 92%

Section: Tablementioning

confidence: 99%

Section: Comparison Of Flocculation Dynamics In One-way and Two-way C...mentioning

confidence: 99%

“…(2019) described the equilibrium separation as . Yao & Capecelatro (2021) expressed the surface energy of the particle as . Marshall & Li (2014) defined the length .…”

Section: Tablementioning

confidence: 99%

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Cohesive sediment: intermediate shear produces maximum aggregate size

et al. 2023

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“…By such an approach, it is possible to study complex flow fields and treat in a more detailed way the dynamics of the dispersed phase, especially when the back-reaction of the particles on the flow is relevant. In this framework, , considering an homogeneous isotropic turbulent flow, computed breakup rates in the early stage of an agglomeration process between adhesive particles, and single events such as restructuring and breakup by turbulent stresses were also studied (Ruan et al, 2020;Yao & Capecelatro, 2021). However, due to the high computational burden, this approach is limited to short simulated physical time, low level of turbulence (small turbulence Reynolds number 𝑅𝑒 𝜆 ) and aggregates made by a small number of primary particles compared to what is typically observed in experiments (Saha et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Heavy and light inertial particle aggregates in homogeneous isotropic turbulence: A study on breakup and stress statistics

Frungieri¹,

Baebler²,

Biferale³

et al. 2022

Preprint

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The breakup of inertial, solid aggregates in an incompressible, homogeneous and isotropic three-dimensional turbulent flow is studied by means of a direct numerical simulation, and by a Lagrangian tracking of the aggregates at varying Stokes number and fluid-to-particle density ratio. Within the point-particle approximation of the Maxey-Riley-Gatignol equations of motion, we analyse the statistics of the time series of shear and drag stresses, which are here both deemed as responsible for particle breakup. We observe that, regardless of the Stokes number, the shear stresses produced by the turbulent velocity gradients similarly impact the breakup statistics of inertial and neutrally buoyant aggregates, and dictate the breakup rate of loose aggregates. When the density ratio is different from unity, drag stresses become dominant and are seen to be able to cause to breakup of also the most resistant aggregates. The present work paves the way for including the role of inertia in population balance models addressing particle breakup in turbulent flows.

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