Two-way coupled bubble laden mixing layer

Yang, Xiaogang; Thomas, N. H.; Guo, Liejin; Hou, Yifeng

doi:10.1016/s0009-2509(01)00416-x

Cited by 23 publications

(12 citation statements)

References 20 publications

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“…Rightley and Lasheras [7] performed an experimental study on a water mixing layer laden with small air bubbles, and elucidated that the bubble distribution is chiefly governed by the large-scale eddies. Druzhinin and Elghobashi [8] and Yang et al [9] conducted numerical investigations on bubble-laden mixing layers, and reported that the bubbles concentrate preferentially around the center of largescale eddy. In single-phase jet, there are also organized large-scale eddies near the nozzle outlet.…”

Section: Introductionmentioning

confidence: 99%

Interaction of Bubbles with Vortex Ring Launched into Bubble Plume

Uchiyama¹,

Kusamichi²

2013

ACES

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This study is concerned with an experimental exploration for the interactions of bubbles with a vortex ring launched vertically upward into a bubble plume. A vortex ring launcher, composed of a cylinder and a piston, is mounted at the bottom of a water tank. Small hydrogen bubbles are released into still water from a cathode, which is wound around the cylinder outlet, by the electrolysis of water. The bubbles rise by the buoyant force and induce a bubble plume. The water in the cylinder is discharged into the bubble plume by the piston, resulting in a laminar vortex ring convecting along the central axis of the plume. Just after the launch of the vortex ring, the bubbles are spirally entrained into the vortex ring with the roll up of the shear layer. The void fraction within the vortex ring increases with the convection of the vortex ring until a certain displacement of the vortex ring, where the reduction occurs. The vortex ring convects with a constant velocity higher than that in still water. The entrained bubbles reduce the strength of the vortex ring.

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Section: Introductionmentioning

confidence: 99%

Interaction of Bubbles with Vortex Ring Launched into Bubble Plume

Uchiyama¹,

Kusamichi²

2013

ACES

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“…In this case, the equation of motion for the bubble is expressed by the following equation [17,18] with the assumption (d):…”

Section: Governing Equations For Bubbly Flowmentioning

confidence: 99%

Numerical Simulation of Air-water Bubbly Jet Issuing from a Square Nozzle by a Vortex in Cell Method

Uchiyama¹

2014

J Chem Eng Process Technol

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A water jet entrained with small air bubbles is simulated. The Vortex in Cell method for bubbly flow proposed by the authors in a prior study is used for the simulation. The method discretizes the vorticity field into vortex elements and computes the time evolution of the flow by tracing the convection of each vortex element using the Lagrangian approach. The bubbly jet issues vertically upward from a nozzle of square cross-section. The Reynolds number based on the water velocity is 5000. The bubble diameter is 0.2 mm, and the bubble volumetric flow rate ratio at the nozzle is 0.0025. The bubbles increase the water turbulence intensity around the jet centerline. This makes the water momentum diffusion in the lateral direction larger at the initial region of the jet. The bubble effect lessens with increasing axial distance from the nozzle. These simulated results are favorably compared with existing measurements, demonstrating the validity of the current simulation method for bubbly jet. In the developed region, the water velocity decay is relaxed and the half-width reduces. This is because the water is accelerated by the bubbles, which have higher axial velocity due to the buoyant force. Keywords:

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“…Since the vortex method proposed by Yang et al (21) solves Eqs. (1) and (2) with α l = 1 and α g = 0, the two-way coupling between the two phases is incomplete.…”

Section: Conservation Equations For Bubbly Flowmentioning

confidence: 99%

“…By using such one-way scheme, Uchiyama (20) performed the three-dimensional simulation of a bubbly jet to search for the possibility to control the bubble dispersion. Yang et al (21) proposed a two-dimensional two-way vortex method, which can take account for the interaction between the two phases, to simulate a plane mixing layer loaded with bubbles. But the volumetric fraction is not considered in the conservation equations for the liquidphase.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation for Gas-Liquid Two-Phase Free Turbulent Flow Based on Vortex in Cell Method

Uchiyama

Degawa

2006

JSME Int. J., Ser. B

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This paper proposes a two-dimensional vortex method, based on Vortex in Cell method, for gas-liquid two-phase free turbulent flow. The behavior of vortex element and the bubble motion are calculated through the Lagrangian approach, while the change in the vorticity due to the bubble is analyzed in the computational grids resolving the flow field. Therefore, the numerical procedure corresponds to the Lagrangian-Eulerian method. The present method is applied to simulate the air-water bubbly flow around a square-section cylinder. The simulation demonstrates that the bubble entrainment into the Karman vortex and the resultant reduction for the strength of vortex are successfully captured by the method. It is also confirmed that the vortex shedding frequency and the pressure distribution on the cylinder are favorably compared with the measured results.

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Two-way coupled bubble laden mixing layer

Cited by 23 publications

References 20 publications

Interaction of Bubbles with Vortex Ring Launched into Bubble Plume

Interaction of Bubbles with Vortex Ring Launched into Bubble Plume

Numerical Simulation of Air-water Bubbly Jet Issuing from a Square Nozzle by a Vortex in Cell Method

Numerical Simulation for Gas-Liquid Two-Phase Free Turbulent Flow Based on Vortex in Cell Method

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