Rise velocities of single bubbles in a narrow channel between parallel flat plates

Hashida, Masaaki; Hayashi, Kosuke; Tomiyama, Akio

doi:10.1016/j.ijmultiphaseflow.2018.09.015

Cited by 18 publications

(23 citation statements)

References 17 publications

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“…From a dynamical point of view, the bubble's motion is characterised by its drag force F D . It can be computed from the drag coefficient C D = F D /(ρv 2 b S/2), where S = πd 2 3 /4 the equivalent spherical surface and not the true projected area 2bh as often considered (Filella et al 2015;Hashida et al 2019Hashida et al , 2020. At dynamic equilibrium, the drag force F D equals the driving force due to buoyancy F B = ρg(πabh) and so, the model developed in (3.1) gives…”

Section: Drag Coefficientmentioning

confidence: 99%

Bubble rise in a Hele-Shaw cell: bridging the gap between viscous and inertial regimes

et al. 2022

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The rise of a single bubble confined between two vertical plates is investigated over a wide range of Reynolds numbers. In particular, we focus on the evolution of the bubble speed, aspect ratio and drag coefficient during the transition from the viscous to the inertial regime. For sufficiently large bubbles, a simple model based on power balance captures the transition for the bubble velocity and matches all the experimental data despite strong time variations of bubble aspect ratio at large Reynolds numbers. Surprisingly, bubbles in the viscous regime systematically exhibit an ellipse elongated along its direction of motion while bubbles in the inertia-dominated regime are always flattened perpendicularly to it.

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Section: Drag Coefficientmentioning

confidence: 99%

Bubble rise in a Hele-Shaw cell: bridging the gap between viscous and inertial regimes

et al. 2022

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“…Due to confinement the bubble is flattened between the two cell-plates. Inertial regimes with no de-wetting-that is where the bubble stays separated from the walls by thin liquid films-have been explored concerning in particular hydrodynamics (Collins 1965a, b;Lazarek and Littman 1974;Bessler and Littman 1987;Fan and Tsuchiya 1990;Bush and Eames 1998;Roig et al 2012;Wang et al 2014;Filella et al 2015;Piedra et al 2015;Wang et al 2016;Hashida et al 2019) or mass transfer (Roudet et al 2017;Felis et al 2019;Zhang et al 2020). Indeed, this particular bubble flow configuration is relevant for fundamental investigation of a potentially interesting new bubble reactor configuration of intermediary size as compared to large bubble columns and small size monoliths flows.…”

Section: Introductionmentioning

confidence: 99%

“…In that case, the wake behind the bubble is closed and consists in attached counter-rotating vortices, which have been observed qualitatively many years ago (see for example Collins 1965b). More recently, deformable confined bubbles of intermediary size, with path and shape oscillations, have been studied experimentally (see Roig et al 2012, Filella et al 2015and Hashida et al 2019. In that case, vortex shedding occurs and the wake consists in a periodic vortex street of counterrotating vortices.…”

Section: Introductionmentioning

confidence: 99%

Exploration by Shake-the-Box technique of the 3D perturbation induced by a bubble rising in a thin-gap cell

et al. 2021

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“…Wall effects were investigated rather extensively for bubbles rising through circular tubes [4][5][6] and through narrow rectangular channels [7][8][9][10][11][12][13]. For circular tubes, wall effects typically cause the elongation of the bubbles in the vertical direction and the alteration of the wake structure behind the rising bubble, resulting in milder bubble deformation and a reduced rise velocity in comparison with the unconfined case.…”

Section: Introductionmentioning

confidence: 99%

Shapes and Rise Velocities of Single Bubbles in a Confined Annular Channel: Experiments and Numerical Simulations

Cioncolini

Magnini

2021

Fluids

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Shapes and rise velocities of single air bubbles rising through stagnant water confined inside an annular channel were investigated by means of experiments and numerical simulations. Fast video imaging and image processing were used for the experiments, whilst the numerical simulations were carried out using the volume of fluid method and the open-source package OpenFOAM. The confinement of the annular channel did not affect the qualitative behavior of the bubbles, which exhibited a wobbling rise dynamic similar to that observed in bubbles rising through unconfined liquids. The effect of the confinement on the shape and rise velocity was evident; the bubbles were less deformed and rose slower in comparison with bubbles rising through unconfined liquids. The present data and numerical simulations, as well as the data collected from the literature for use here, indicate that the size, shape, and rise velocity of single bubbles are closely linked together, and prediction methods that fail to recognize this perform poorly. This study and the limited evidence documented in the literature indicate that the confinement effects observed in non-circular channels of complex shape are more complicated than those observed with circular tubes, and much less well understood.

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Rise velocities of single bubbles in a narrow channel between parallel flat plates

Cited by 18 publications

References 17 publications

Bubble rise in a Hele-Shaw cell: bridging the gap between viscous and inertial regimes

Bubble rise in a Hele-Shaw cell: bridging the gap between viscous and inertial regimes

Exploration by Shake-the-Box technique of the 3D perturbation induced by a bubble rising in a thin-gap cell

Shapes and Rise Velocities of Single Bubbles in a Confined Annular Channel: Experiments and Numerical Simulations

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