Towards the understanding of bubble-bubble interaction upon formation at submerged orifices: A numerical approach

Rana, Basanta Kumar; Das, Arup Kumar; Das, Prasanta Kumar

doi:10.1016/j.ces.2016.12.049

Cited by 32 publications

(14 citation statements)

References 26 publications

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“…Deformation of the interface in the form of entrainment − of one fluid into another always remains popular and interesting among researchers as it causes enhancement of both heat and mass transfer by increasing the interfacial surface area. This phenomenon is often seen in various industries − (jet pump, ejector, aerator, chemical reactors, food processing, volcanic eruption, chemical reaction, splashes, atmospheric mixed layer, etc.)…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation and Analytical Prediction on the Development of Entrained Air Filament Caused by the Combined Effect of Rotational Field and Free Stream Flow

Panda

Rana

2022

Ind. Eng. Chem. Res.

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In this study, an attempt has been made to characterize the pattern of entrained air filament inside a liquid bath of high viscosity by employing a fully submerged horizontal rotating solid roller where the lighter phase is allowed to flow uniformly above the bath. The influence of roller rotational speed (ω), depth of submergence (h/D), strength of the crossflow (Re flow ), and fluid pair (Mo) on the entrainment profile has been established numerically to report the physical insights. An open-source Gerris solver has been employed to perform this computational work. We have also described the transient dynamics of the cusp tip for various input pertinent parameters. In addition, both departure of bubbles at the tip of the steady configured cusp and the entrainment rate are predicted for different gas−liquid pairs. Interfacial configurations are also obtained as a consequence of the effect of gravitational pull. Lastly, an analytical analysis predicted successfully the obtaining of the structure of the cusp, and the predictions are quite satisfactory compared to present numerical data.

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Section: Introductionmentioning

confidence: 99%

Numerical Simulation and Analytical Prediction on the Development of Entrained Air Filament Caused by the Combined Effect of Rotational Field and Free Stream Flow

Panda

Rana

2022

Ind. Eng. Chem. Res.

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“…Once we realize the genuine factors that determine bubble formation and detachment, we will be able to control the bubble volume and form, which is an important issue in the petrochemical industry, cosmetic industry, nuclear reactors, mineral processing, etc. [6]. In addition, we provide an alternative explanation for bubble pinch-off, which may be helpful to related research [7].…”

Section: Introductionmentioning

confidence: 86%

The role of solid surface in bubble formation and detachment at a submerged orifice

Jiang

2017

Preprint

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Buoyancy forceAdhesive force Gas-solid surface stressBubble formation and detachment at a submerged orifice exists widely in both daily life and academic research, and the influence of solid surface on bubble formation and detachment has also been extensively investigated. For example, it has been observed that the bubble on a hydrophobic surface is larger than the one on a hydrophilic surface. However, this phenomenon is not sufficiently

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“…The presence of two approaching films in a cell has been considered as criterion of hydrodynamic rupture. It can be argued that with smaller mesh size than capillary length scale, hydrodynamic rupture will mimic physical rupture in the macroscale, 33 but to obtain microscale information during the physical rupture requires of multiscale simulation cannot be avoided. The flattening of the nose of the Taylor bubble occurs at the expense of its kinetic energy 34 in order to conserve its energy budget.…”

Section: Industrial and Engineering Chemistry Researchmentioning

confidence: 99%

Passage of a Taylor Bubble through a Stratified Liquid–Liquid Interface

Kumar

Rohilla

Das

2019

Ind. Eng. Chem. Res.

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The bypass of an air bubble through a liquid−liquid interface may produce rich fluidic physics. Air injection is a passive technique to mix the contents of the two separated fluids and provides an effective heat and mass transfer intensification by increasing the interfacial area between them. Entrainment of heavier fluid into the lighter fluid at atmospheric and isothermal conditions has been simulated by using the VOF (volume of fluid) technique mimicking a Taylor bubble bypass through a horizontal liquid−liquid interface of water and polydimethylsiloxane (PDMS) solution. The migration of a Taylor bubble across the interface is completed through five different stages, namely, approach, encapsulation, de-encapsulation, entrainment, and detrainment. The bubble kinematics, entrained water volume, microdroplets formation, and film thinning characteristics have been studied in detail. The marginal pinch-off mechanism for the rupturing of the entrapped water film has been observed due to the presence of the surface tension gradient. The film thinning initially occurs due to the domination of gravitational force and eventually due to capillary force after the entrapped film thickness achieves capillary length scale, δ crit ∼ (σ/(ρg)) 1/2 . The entrapped water film shrinks over the interface of the Taylor bubble to generate the water microdroplets in the PDMS solution. The entrained height and volume of the water column grows quadratically with time.

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Towards the understanding of bubble-bubble interaction upon formation at submerged orifices: A numerical approach

Cited by 32 publications

References 26 publications

Numerical Simulation and Analytical Prediction on the Development of Entrained Air Filament Caused by the Combined Effect of Rotational Field and Free Stream Flow

Numerical Simulation and Analytical Prediction on the Development of Entrained Air Filament Caused by the Combined Effect of Rotational Field and Free Stream Flow

The role of solid surface in bubble formation and detachment at a submerged orifice

Passage of a Taylor Bubble through a Stratified Liquid–Liquid Interface

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