Generation and Transport of Solid Particle Clusters Using a Vortex Ring Launched into Water

Uchiyama, Tomomi; Yano, Chiaki; Degawa, Tomohiro

doi:10.18178/ijcea.2017.8.4.666

Cited by 5 publications

(2 citation statements)

References 12 publications

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“…In another example of targeted particle delivery, the controlled vortex rings reconnection is used, which changes the topology of the vortex ring, accompanied by repulsion in the plane perpendicular to the direction of propagation [14][15][16]. Several experimental studies focused on the flight distance of particles inside a vortex ring depending on the initial conditions [17][18][19][20][21][22][23][24], and theoretical estimates of the main vortex parameters were presented [25][26][27]. However, to the best of the authors' knowledge, in the existing literature, neither the abilities of vortices to transport different microparticles nor the dependencies of the concentration of the particles in the vortex ring along the entire path of the movement have been studied numerically or analytically.…”

Section: Introductionmentioning

confidence: 99%

Transporting Particles with Vortex Rings

Gulinyan,

Kuzikov,

Podgornyi

et al. 2023

Fluids

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Due to their long-lived nature, vortex rings are highly promising for the non-contact transportation of colloidal microparticles. However, because of the high complexity of the structures, their description using rigorous, closed-form mathematical expressions is challenging, particularly in the presence of strongly inhomogeneous colloidal suspensions. In this work, we comprehensively study this phenomenon, placing special emphasis on a quantitative description of the ability of vortex rings to move the particles suspended in a liquid over distances significantly exceeding the ring’s dimensions. Moreover, within the study, we present straightforward analytical approximations extracted by using the fitting of the experimental and numerical simulation observations that reveal the dynamics of vortex rings transporting the microparticles. It includes both the dependence of the concentration on the distance traveled by the vortex ring and coefficients describing the evolution of vortex ring shape in time, which were not presented in the literature before. It turns out that despite the fact that 2D modeling is a simplification of the full 3D problem solution and is unable to capture some of the minor effects of real behavior, it has demonstrated a good consistency with the results obtained via experiments regarding the process of particles transportation.

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Section: Introductionmentioning

confidence: 99%

Transporting Particles with Vortex Rings

Gulinyan,

Kuzikov,

Podgornyi

et al. 2023

Fluids

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“…The motion of particles trapped into a vortex ring launched into quiescent water was visualized. Uchiyama et al [10] experimentally explored the generation and transport of clusters of polyacetal particles (mean diameter: 1.52 m, specific weight: 1.4) by a vortex ring. Bernal et al [11] experimentally and numerically investigated the formation and propagation of a distinct droplet caused by the collision of a vortex ring with the density interface in a two-layer density-stratified fluid.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Mixing by Interaction of a Vortex Ring with a Density Interface

Degawa¹,

Uchiyama²

2018

JEPE

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This study numerically explores the mixing caused by a vortex ring launched upward into a two-layer density-stratified fluid in a rectangular tank so as to search for a highly efficient mixing method. The upper and lower fluid layers are an aqueous glycerol solution and an aqueous solution of potassium dihydrogen phosphate (KH 2 PO 4), respectively. The phenomena of vortex rings with Reynolds numbers of 4000, 6000, and 8000 were simulated. The vortex-in-cell method is used to calculate the dynamics of the upper and lower fluids, and the CIP method is used to trace the concentration of the lower fluid. The simulations reproduce the mixing process successfully and elucidate the relationship between mixing efficiency and the Reynolds number of the vortex ring.

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A computational study of particle dynamics in synthetic jet flow field

Stewart,

Panda,

Arumuru

2023

Physics of Fluids

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This computational study aims to investigate the transport and dispersion of solid particles in a synthetic jet flow field. Solid spherical particles were injected into the jet at a single point, and their behavior was observed until they left the domain. The interaction between the particles and the vortex rings in the jet was compared for synthetic jets, with different Strouhal numbers (0.05, 0.1, and 0.2). The Reynolds number (Re = 150), the mass of injected particles, particle diameter distribution, and particle Stokes number at injection were kept constant. The results showed that the jet's momentum mainly transported the particles, while the vorticity of the vortex rings caused them to spread. The particle Stokes number affected the distribution of particles within the jet, with a higher Stokes number particle concentrating at the jet's center and lower Stokes number particles being carried within the vortex ring. For the low Strouhal number jet, the combined effect of the fast decline in the particle Stokes number, low vorticity of vortex ring, significant distance between successive vortices, and high jet momentum resulted in a higher spread of particles and rapid transport across the domain. As the Strouhal number increased, the particle Stokes number decreased slowly downstream; moreover, the vorticity of the vortex ring increased, the distance between vortices decreased, and low momentum imparted by the jet led to less particle spread and slower transport. Overall, the spread and transport of particles were most effective in the synthetic jet, with the low Strouhal number.

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Generation and Transport of Solid Particle Clusters Using a Vortex Ring Launched into Water

Cited by 5 publications

References 12 publications

Transporting Particles with Vortex Rings

Transporting Particles with Vortex Rings

Numerical Simulation of Mixing by Interaction of a Vortex Ring with a Density Interface

A computational study of particle dynamics in synthetic jet flow field

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