The onset of gas entrainment from a flowing stratified gas–liquid regime in dual discharging branches

Bowden, Robert C.; Hassan, Ibrahim

doi:10.1016/j.ijmultiphaseflow.2011.06.008

Cited by 14 publications

(2 citation statements)

References 19 publications

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“…On the other hand, this phenomenon is undesirable in typical industrial operations such as the pouring of molten glass or metal which often causes degradation in strength due to entrapment of gas. Entrainment of gas is mainly caused by liquid jet impingement in a pool and widely studied by several researchers. − Entrapment of gas into liquid in stratified configuration can also be caused by rotating a solid roller at the interfacial plane. This can be named as rotary entrainment by mimicking the type of prime mover behind the phenomenon.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Air Entrainment and Liquid Film Wrapping around a Rotating Cylinder

Rana

Das

2016

Ind. Eng. Chem. Res.

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Entrainment of a gaseous cusp and wrapping dynamics of liquid film around the horizontal rotating roller have been studied in a stratified layer. Finite volume based simulations have been used for numerical prediction of the interface which has been tracked using volume of fluid (VOF) algorithm. After establishing the transient dynamics of the wrapping at receding front and entrainment at the advancing front, we showed the effect of liquid properties on interfacial dynamics. Mutual interplay between centrifugal force due to rotation of the cylinder and viscous damping generates different patterns of entrainment such as cusp formation, entrained air wrapping, ejection of bubble, and penetration of wrap inside entrainment. Variation of wrapped liquid thickness at the receding end is also studied for a wide range of Morton number and rotational speed. Finally, using scale analysis, we showed that viscosity plays a major role in deciding the azimuthal wrap thickness.

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Section: Introductionmentioning

confidence: 99%

Numerical Study of Air Entrainment and Liquid Film Wrapping around a Rotating Cylinder

Rana

Das

2016

Ind. Eng. Chem. Res.

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“…T-junctions are very commonly used in industries such as nuclear power plants, petroleum and chemical industries etc. [1][2][3]. Usually, when a two-phase flow encounters a T-junction, it tends to split unevenly among the two outlets of the T-junction [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of two–phase separation in a small diameter ratio T‐junction

Pao

Saieed

Hashim

et al. 2017

Materialwissenschaft Werkst

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The utilization of T‐junctions for flow division is quite common in industries. Due to the phenomena known as multiphase maldistribution, occurring in a T‐junction, they are often used as partial phase separators for reducing the work load on phase separation devices in oil and gas platforms. Previous literature says that reducing the diameter ratio of the T‐junction improves the two‐phase separation, however it was also reported that reducing the diameter ratio too much has a negative effect on two‐phase separation. To test this, a numerical study was performed to see the two‐phase stratified flow separation in 1, 0.6 and 0.167 diameter ratio T‐junctions. Furthermore, the impact of air superficial velocity on phase maldistribution at the junction is also considered. The T‐junctions with diameter ratios 1 and 0.6 were just used for the validation of present model, by comparing the obtained numerical results with previous experimental data. While, 0.167 diameter ratio T‐junction is the one for which the actual analysis was performed. It is concluded that an increase in air superficial velocity aids liquid carryover, whereas liquid carryover is very sensitive to side arm extraction rates in a very small diameter ratio T‐junction.

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Study on droplet entrainment in the composite scrubbing–cooling chamber

Wang

Yan

Guo

et al. 2017

Asia-Pacific J Chem Eng

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A cold model experimental device was established for studying droplet entrainment in the composite scrubbing-cooling chamber. The effect of the superficial gas velocity, the initial liquid flow velocity of the nozzle, and the radial position of nozzles on droplet entrainment was investigated. The experimental results show that the droplet entrainment increases with the increase of the superficial gas velocity and the flow rate of falling film, but its profile is quite mean in the radial direction in the chamber. The droplet entrainment decreases by about 40% when the number of nozzles increases from two to four. Increasing the nozzle number can make the droplet well distributed and reduce droplet entrainment. Based on the experiment data, an empirical correlation for droplet entrainment fraction is also obtained, as E ∝ Re 1.92 ·We 0.52 . The optimization study for the structure of the scrubbing-cooling chamber can provide some guidance for the industrial application.

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The onset of gas entrainment from a flowing stratified gas–liquid regime in dual discharging branches

Cited by 14 publications

References 19 publications

Numerical Study of Air Entrainment and Liquid Film Wrapping around a Rotating Cylinder

Numerical Study of Air Entrainment and Liquid Film Wrapping around a Rotating Cylinder

Numerical simulation of two–phase separation in a small diameter ratio T‐junction

Study on droplet entrainment in the composite scrubbing–cooling chamber

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