Flow-induced forces on two nearby spheres

Yoon, Dong-Hyeog; Yang, Kyung‐Soo

doi:10.1063/1.2769660

Cited by 29 publications

(9 citation statements)

References 18 publications

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“…The vorticity imbalance between the top and bottom regions of the reference particle brings about a net torque exerted on the particle. The interpretation of the PDFs emerging from our analysis is consistent with the observations made with a binary system of two spheres exhibiting the same dependency of the forces on relative positions of the spheres (Prahl et al 2007;Yoon & Yang 2007). Such modification of the forces and torques were also elucidated by Akiki et al (2016).…”

Section: Probability Distribution Mapssupporting

confidence: 89%

Microstructure-informed probability-driven point-particle model for hydrodynamic forces and torques in particle-laden flows

Ahmadi

Wachs

2020

J. Fluid Mech.

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Section: Probability Distribution Mapssupporting

confidence: 89%

Microstructure-informed probability-driven point-particle model for hydrodynamic forces and torques in particle-laden flows

Ahmadi

Wachs

2020

J. Fluid Mech.

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“…The case of fixed bodies placed side by side has received equal attention when the wakes of the bodies are unsteady. For a Reynolds number of 300 corresponding to unsteady wakes for solid spheres, Yoon & Yang (2007) found numerically that spheres placed side by side repel one another for all the relative distances investigated, namely ∆ h 5, indicating that repulsion between two side-by-side fixed spheres occurs for separation distances that are larger for unsteady wakes than for steady ones. Results related to the interaction between the unsteady wakes of the bodies were also provided.…”

Section: Introductionmentioning

confidence: 89%

Interaction of two axisymmetric bodies falling side by side at moderate Reynolds numbers

Ern

Brosse

2014

J. Fluid Mech.

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We consider the interaction of two identical disks freely falling side by side in a fluid at rest for Reynolds numbers ranging from 100 to 300, corresponding to rectilinear and oscillatory paths. For the three aspect ratios of the disks investigated, we observed that the bodies always repel one another when the horizontal distance between their centres of gravity is less than 4.5 diameters. They never come closer for distances spanning between 4.5 and 6 diameters. Beyond the latter distance, the disks appear indifferent to each other. For both rectilinear and periodic paths, the repulsion effect is weak, leading to an overall horizontal drift lower than 3 % of the vertical displacement. We propose a model for the repulsion coefficient Cr, which decreases with the separation distance between the bodies and is inversely proportional to the aspect ratio of the bodies, Cr thus being stronger for the thicker ones. Furthermore, in the case of the oscillatory paths, we show that the effect of the interaction reduces to the repulsion effect, since the characteristics of the oscillatory motion of each disk appear unaffected by the presence of the companion disk and no synchronization is observed between the paths, nor between the wakes, of the two disks.

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“…They studied mainly the flow around the particles and concluded that for H/D0=1 (particles are in contact) the particles act as a rigid bluff body, while for H/D0≥2 the interaction between the shedding vortices is minimized as well as the effect of the jet-like flow occurring through them. Numerical studies of similar particle arrangements were performed by Folkersma et al [9], Tsuji et al [10], Ardekani et al [11], Prahl et al [12], Yoon and Yang [13] and by Jadoon [14]. The Re numbers examined range from 5•10 -7 up to 600, while the non-dimensional distance between the particles are in the range of 1 up to 23.…”

Section: Introductionmentioning

confidence: 91%

Numerical investigation of the aerodynamic breakup of a parallel moving droplet cluster

Stefanitsis

Strotos

Νikolopoulos

et al. 2019

International Journal of Multiphase Flow

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The present work examines numerically the aerodynamic breakup of a cluster of Diesel droplets moving in parallel with respect to the gas flow. Two-and three-dimensional simulations of the incompressible Navier-Stokes equations together with the VOF method are performed for Weber (We) numbers in the range of 5 up to 60 and non-dimensional distance between the droplets (H/D0) ranging from 1.25 to 20. The numerical results indicate that the proximity of droplets affects their breakup for distances H/D0≤5. For low droplet proximity distances (H/D0≤2.5), the droplets experience the socalled shuttlecock breakup mode, which has been also identified for droplets in tandem formations in a previous authors' work and is characterized by an oblique peripheral stretching of the droplet. With decreasing H/D0 the breakup initiation time decreases, while the drag coefficient increases relative to that of isolated droplets. When the distance between the droplets is low enough (H/D0<1.5), this can result in critical We number, i.e. minimum We number leading to breakup, lower than that of an isolated droplet at the same conditions.

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Flow-induced forces on two nearby spheres

Cited by 29 publications

References 18 publications

Microstructure-informed probability-driven point-particle model for hydrodynamic forces and torques in particle-laden flows

Microstructure-informed probability-driven point-particle model for hydrodynamic forces and torques in particle-laden flows

Interaction of two axisymmetric bodies falling side by side at moderate Reynolds numbers

Numerical investigation of the aerodynamic breakup of a parallel moving droplet cluster

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