Feasibility of N<sub>2</sub>/sunflower oil compound drop formation in methanol induced by bubble train

Duangsuwan, Wiriya; Tüzün, U.; Sermon, Paul A.

doi:10.1002/aic.12208

Cited by 8 publications

(7 citation statements)

References 20 publications

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“…The collision of a bubble with a liquid–liquid interface has received much less research focus compared to a solid–liquid or gas–liquid interface. Most experimental studies focused on bubbles that pass through the liquid–liquid interface with a volume of the lower liquid entrained around or behind the bubble. − These works have focused on the influence of upper and lower liquid properties, the formation of encapsulated bubbles, stages of film rupture, and identifying and classifying associated flow regimes . Numerical models of this process have relied on grid-based simulation techniques, either using commercial software such as ANSYS Fluent or other customized schemes to solve the flow equations. ,, Confining previous studies to bubbles that do not pass through the interface but instead experience a bouncing behavior similar to that seen with solid and free surface collisions significantly reduces the breadth of relevant previous works.…”

Section: Introductionmentioning

confidence: 99%

Modeling Bubble Collisions at Liquid–Liquid and Compound Interfaces

Emery

Kandlikar

2019

Langmuir

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The collision of a bubble at liquid–liquid, solid–liquid–liquid, and gas–liquid–liquid interfaces, the latter two of which are referred to as compound interfaces, is modeled to predict the bubble’s velocity profile and the pressure buildup and drainage rate of the film(s) formed at impact. A force balance approach, previously outlined for bubble collisions at solid and free surfaces, is employed, which takes into account four forces acting on the bubble: buoyancy, drag, inertia of the surrounding liquid through an added mass force, and a film force resulting from the pressure buildup in the liquid film formed between the bubble and the interface upon impact. The augmented Young–Laplace equation is applied to define the pressure buildup in the film(s), while lubrication theory is employed to define the film drainage rate(s) through the use of the Stokes–Reynolds equation. This is the first time this modeling technique has been implemented for bubble collisions with these interface types as all previous models have relied only on grid-based simulations. The models were validated through experiments conducted here with water and silicone oils of various viscosities and from data found in literature. A reasonable agreement is observed between the theoretical and experimental velocity profiles found for these liquid combinations under varying conditions of impact velocity and top film thickness. The spatiotemporal film thickness and pressure profile evolution, features not yet able to be captured through experiment, are also presented and discussed.

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Section: Introductionmentioning

confidence: 99%

Modeling Bubble Collisions at Liquid–Liquid and Compound Interfaces

Emery

Kandlikar

2019

Langmuir

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“…Various researchers have additionally developed numerical simulation of the bubble passage process. 7,8 In the only study found using bubble streams, Duangsuwan et al 12 injected a stream of nitrogen bubbles through a sunflower oil−methanol interface in an attempt to make continuous bubble shells. While possible, they found that the stabilization of the film around the bubble after its formation was difficult to maintain.…”

Section: ■ Introductionmentioning

confidence: 99%

“…The passage of a single bubble or a bubble stream through a liquid–liquid interface is a highly dynamic process that has relevance in numerous industrial applications. Previous studies of this phenomenon focus on their importance in metallurgical processes, − chemical processes such as liquid–liquid extraction, ,,− nuclear reactor safety, ,, biodiesel production, and direct contact heat transfer. , Hollow metallic shells produced from this process also have many applications such as solid fuels, structural material, pharmaceuticals, explosives, etc . Although bubble passage through a liquid–liquid interface has significant relevance to many industrial applications, it remains an understudied area in need of further exploration.…”

Section: Introductionmentioning

confidence: 99%

“…A number of experimental and numerical studies have been performed on bubble passage through a liquid–liquid interface. − ,,,− Many of these consider just an entrained volume of liquid, that is, the volume of the bottom liquid carried over the interface by the bubble. − ,,, Greene et al , found that entrainment volume was inversely proportional to the density difference between the bottom and top liquid. Interfacial tension was shown to have relatively little effect on entrainment volume but did affect the onset of entrainment.…”

Section: Introductionmentioning

confidence: 99%

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Flow Regimes and Transition Criteria during Passage of Bubbles through a Liquid–Liquid Interface

2018

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The passage of a single bubble or a stream of bubbles through a liquid-liquid interface is a highly dynamic process that can result in a number of different outcomes. Previous studies focused primarily on a single bubble and single flow regime, and very few investigations have considered bubble streams. In the present work, six different liquid combinations made up of water, ethanol, a perfluorocarbon liquid, PP1, and one of three different viscosity silicone oils are tested with air bubbles from 2 to 6 mm in diameter rising between 5 and 55 cm/s. Both single bubbles and bubble streams varying in frequency from 5 to 40 bubbles/s are tested. High-speed imaging is used to capture and classify the flow regimes associated with each flow type. Four different flow regimes are identified for single-bubble passage, and six are found for bubble stream passage. On the basis of theoretical considerations, nondimensional numbers are developed for characterizing the flow regimes and maps are generated that distinguish them and define flow regime transitions.

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“…Also, an oppositely charged oil-water interface makes more and finer droplets. [21] Duangsuwan et al [22] reported an experimental study on the feasibility of nitrogen-sunflower oil compound drop formation in methanol, induced by bubble train. They observed that if the bubble train penetrates with the entrained oil droplets, nitrogen bubbles and oil droplets separate clearly from each other in methanol.…”

Section: Introductionmentioning

confidence: 99%

Passage of a rising bubble through a liquid‐liquid interface: A flow map for different regimes

2021

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The passage of a rising air bubble through a stratified horizontal interface between two Newtonian liquids is studied numerically. A ternary phase-field model has been utilized for capturing the interface between three immiscible fluids. According to the previous studies, the density, viscosity, and surface tension of the two liquids, in addition to the bubble diameter, are the effective parameters of bubble interaction with the interface. By changing these variables, three main flow patterns are identified in numerical simulations. Penetration flow regime is observed when the bubble enters the upper liquid alone and does not raise the lower liquid. Entrainment flow regime occurs when the bubble lifts some of the heavier liquid to the lighter liquid but still rises alone. If the bubble holds a film of the denser liquid when it rises in the upper liquid, envelopment flow regime takes place. A flow regime map is represented to distinguish the aforementioned flow patterns using Weber and Morton numbers and determine regime transition criteria based on these two dimensionless parameters. For Weber numbers lower than 30, or Morton numbers higher than 1.7 × 10 −2 , the penetration regime is observed. On the contrary, when the Weber number is higher than 65 and the Morton number is lower than 7 × 10 −5 , the envelopment regime occurs. The entrainment pattern happens between these ranges and two additional limiting relations of 320Mo 0.18 < We < 1500Mo 0.23 .

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Feasibility of N₂/sunflower oil compound drop formation in methanol induced by bubble train

Cited by 8 publications

References 20 publications

Modeling Bubble Collisions at Liquid–Liquid and Compound Interfaces

Modeling Bubble Collisions at Liquid–Liquid and Compound Interfaces

Flow Regimes and Transition Criteria during Passage of Bubbles through a Liquid–Liquid Interface

Passage of a rising bubble through a liquid‐liquid interface: A flow map for different regimes

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Feasibility of N2/sunflower oil compound drop formation in methanol induced by bubble train

Cited by 8 publications

References 20 publications

Modeling Bubble Collisions at Liquid–Liquid and Compound Interfaces

Modeling Bubble Collisions at Liquid–Liquid and Compound Interfaces

Flow Regimes and Transition Criteria during Passage of Bubbles through a Liquid–Liquid Interface

Passage of a rising bubble through a liquid‐liquid interface: A flow map for different regimes

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Feasibility of N₂/sunflower oil compound drop formation in methanol induced by bubble train