Large bubbles attached to spargers in downwards two-phase flow

Bacon, R.P.; Scott, D. M.; Thorpe, Rex B.

doi:10.1016/0301-9322(95)00021-o

Cited by 17 publications

(4 citation statements)

References 12 publications

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“…Fig. 5 shows a comparison of the predicted air entrainment rate vs. the film velocity in comparison with the data obtained by Bacon et al (1995b) and Lee et al (1997) with glycerol solution and the horizontal (HS) sparger. These coordinates were used by Lee et al (1999) following the suggestion of Sene (1988).…”

Section: Discussionmentioning

confidence: 95%

Modelling of gas entrainment from Taylor bubbles. Part B: A stationary bubble

Brauner

Ullmann

2004

International Journal of Multiphase Flow

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Section: Discussionmentioning

confidence: 95%

Modelling of gas entrainment from Taylor bubbles. Part B: A stationary bubble

Brauner

Ullmann

2004

International Journal of Multiphase Flow

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“…Hence, the gas content in the liquid film is usually ignored. However, Bacon et al [18] found that the gas content in a liquid film is much higher than that in the air-water during bubble breakage experiments on an air-oil two-phase system, which shows that bubble breakage is more serious in air-oil systems. Nydal and Banerjee [19] found that the bubble breakage phenomenon becomes more noticeable with increasing liquid plug speed, and the bubble breakage can only be ignored when the liquid plug speed is small enough.…”

Section: Introductionmentioning

confidence: 99%

Modeling of Gas Migration in Large Elevation Difference Oil Transmission Pipelines during the Commissioning Process

Feng¹,

Zhu²,

Song³

et al. 2022

Energies

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Oil pipeline construction and operation in mountainous areas have increased in southwestern China, with oil consumption increasing. Such liquid pipelines laid in mountainous areas continuously undulate along the terrain, resulting in many large elevation difference pipe segments. Serious gas block problems often occur during the commissioning process of these pipelines due to the gas/air accumulation at the high point of the pipe, which causes pipeline overpressure and vibration, and even safety accidents such as bursting pipes. To solve this problem, the gas–liquid replacement model and its numerical solution are established with consideration of the initial gas accumulation formation and the gas segment compression processes in a U-shaped pipe during the initial start-up operation. Additionally, considering the interactions of the gas-phase transfer in the continuous U-shaped pipe, and the influence of the length, inclination angle, and backpressure on the air vent process, the gas migration model for a continuous U-shaped pipe is established to predict the gas movement process. Finally, the field oil pipe production data were applied to verify the model. The results demonstrate that the maximum deviation between the calculated pressure during the start-up process and real data is 0.3 MPa, and the critical point of crushing the gas in the pipe section is about 0.2 Mpa. Additionally, the results show that the mass transfer of the gas section in the multi-pipe hydraulic air vent process causes the gas accumulation section to increase in downstream of the pipe. This study’s achievements can provide theoretical guidance and technical support for the safe and stable operation of continuous undulating liquid pipelines with large drops.

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“…Under certain conditions in loop reactors the cavity grows in length and occupies almost the entire cross-sectional fl ow area, which can cause serious operational problems by reducing the velocity of the recirculating fl ow and may cause instability in the reactor. Bacon et al (1995), Bacon (1995), Lee at al. (1997), Forrester and Evans (1996), and Evans et al (2000) carried out studies on the phenomena governing behaviour of the attached gas slugs and its minimization in a downward liquid fl ow.…”

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confidence: 99%

“…(1997), Forrester and Evans (1996), and Evans et al (2000) carried out studies on the phenomena governing behaviour of the attached gas slugs and its minimization in a downward liquid fl ow. Bacon (1995) and Bacon et al (1995) investigated several types of spargers and methods of gas introduction into down-fl owing liquids but none of them could eliminate formation of the attached gas cavities. Similar gas cavities form behind gas-inducing impeller blades at a certain range of rotational speeds and gas fl ow rates in a stirred tank reactor, degrading fi ne gas dispersion (Rigby et al, 1995, Forrester andRielly 1998).…”

mentioning

confidence: 99%