The behaviour of large drops in immiscible liquids

Wairegi, T.; Grace, John R.

doi:10.1016/0301-9322(76)90036-7

Cited by 25 publications

(10 citation statements)

References 12 publications

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“…The above equation was derived on the basis of Bernoulli's theorem that implies that viscous forces were insignificant. Contrary to the present results, Collins [4] and Wairegi and Grace [17] predicted high positive pressure at the bubble rim, which would oppose the tendency of skirt formation.…”

Section: -9contrasting

confidence: 99%

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Calculation of the Pressure Field around a Spherical-Cap Bubble

Kendoush¹

2022

International Conference on Fluid Flow, Heat and Mass Transfer

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The pressure field around a spherical-cap bubble was divided into a spherical frontal and a wake region. The pressure field in each region was derived from the equation of motion. Due to the almost flat base of the bubble, the flow field of the wake was considered similar to that behind a circular disk. The calculated pressure distribution revealed the phenomenon of the bubble skirt. The predicted pressure field of the spherical-cap bubble agreed well with the available experimental and theoretical results.

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Section: -9contrasting

confidence: 99%

“…5 between Eq. 17, the theoretical solution of Collins [4] and the equation of Wairegi and Grace [17] which was quoted in the book of Clift, Grace and Weber [18] (p. 205) as…”

Section: -9mentioning

confidence: 99%

Calculation of the Pressure Field around a Spherical-Cap Bubble

Kendoush¹

2022

International Conference on Fluid Flow, Heat and Mass Transfer

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“…which fits the data very well. Grace et al (1976) and Bhaga and Grace (1981) report experimental studies of the shape and terminal velocity of rising spherical cap bubbles, as well as visualization of the flow pattern around them.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Investigation of Bubbles Rising at Intermediate Reynolds and Large Weber Numbers

Hoffmann¹,

Bogaard²

1995

Ind. Eng. Chem. Res.

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“…The motion of large droplets through immiscible fluid was experimentally investigated by Wairegi et al [11] for a wide range of Eötvos numbers. The shape acquired by the droplet depends on the balance between forces which tend to restore spherical shape (surface tension force) and forces which are disruptive in nature (inertial force).…”

Section: Physical Backgroundmentioning

confidence: 99%

“…The shape acquired by the droplet depends on the balance between forces which tend to restore spherical shape (surface tension force) and forces which are disruptive in nature (inertial force). The motion of large droplets through immiscible fluid was experimentally investigated by Wairegi et al [11] for a wide range of Eötvos numbers. They have reported different shapes of droplets which include ellipsoidal and spherical-caps with and without skirts, crescents, biconcave disks, toroids and wobbling irregular droplets.…”

Section: Physical Backgroundmentioning

confidence: 99%

Effect of surfactant on the dynamics of a crude oil droplet in water column: Experimental and numerical investigation

et al. 2014

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In this study we have investigated the effect of surfactant, sodium dodecyl sulfate (SDS), on the dynamics of a single crude oil droplet, rising in a quiescent water column. Experiments were conducted in a tank, in which an oil droplet was released into a stagnant water column through a nozzle. The droplets ranging from 0.3 to 0.85 cm were produced from three different sized nozzles. The shape adopted by the emanating droplets varied from spherical to oblate. SDS concentrations were varied from 0 to 750 ppm in water. The adsorption of surfactant reduced the interfacial tension at oil-water interface which resulted in generation of smaller sized droplets at the nozzle and caused the droplet to flatten. Consequently, the rise velocities of droplets decreased.A numerical model based on finite volume method was developed using commercial CFD package ANSYS Fluent 1 . The model employed volume of fluid method, suggested by Hirt and Nichols (Journal of Computational Physics 1981, 39, 201), with an interface reconstruction technique based on piecewise linear representation for tracking the oil-water interface. The influence of surface tension on the droplet dynamics was captured by including Continuum Surface force (CSF) approach suggested by Brackbill, Kothe, and Zemach (Journal of Computational Physics 1992, 100, 335). The shape and rise velocities predicted from model were in good agreement with experimental data. The results from simulations were used, to analyze the wake structure and pressure distribution around the droplet. It was found that the smaller droplets which ascended in rectilinear path were associated with an axisymmetric wakes whereas larger and intermediate sized droplets in high SDS concentration wobbled as they ascended because of asymmetric wakes.

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The behaviour of large drops in immiscible liquids

Cited by 25 publications

References 12 publications

Calculation of the Pressure Field around a Spherical-Cap Bubble

Calculation of the Pressure Field around a Spherical-Cap Bubble

A Numerical Investigation of Bubbles Rising at Intermediate Reynolds and Large Weber Numbers

Effect of surfactant on the dynamics of a crude oil droplet in water column: Experimental and numerical investigation

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