Experimental analysis of downward liquid-gas slug flow in slightly inclined pipes

Rodrigues, Rômulo L.P.; Bertoldi, Dalton; Santos, Eduardo Nunes dos; Schneider, Fábio Alencar; Neto, Moisés A. Marcelino; Silva, Marco J. da; Morales, Rigoberto E. M.

doi:10.1016/j.expthermflusci.2019.01.017

Cited by 21 publications

(3 citation statements)

References 56 publications

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“…C0 <1) beyond Transition-I, after which the bubble descends in the direction of liquid flow. However, the bubble eccentricity and shape distortion after Transition-I is also reported at other downward inclination angles, as observed by experimental studies of Bhagwat and Ghajar (2017), Rodrigues et al (2019), and the numerical studies of Figueroa-Espinoza and Fabre (2011) and Lizzaraga-Garcia et al (2021). It is also observed in these studies that in upward flow, Transition-I is gradual and occurs over a wide range of Reynolds numbers, but sharp and over a narrow range of Reynolds numbers in the downward flow.…”

Section: Taylor Bubble Physical Behaviorsupporting

confidence: 57%

Investigation of Taylor Bubble Behavior in Upward and Downward Vertical and Inclined Flows

Aql,

Al-Safran

2023

Preprint

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Taylor bubble dynamics in two-phase flow are vital for many engineering applications, impacting momentum, heat, and mass transfer efficiencies. Grasping these dynamics is key for reactors, pipelines, and enhanced oil recovery system designs. In slug flow, the movement of liquid slugs and Taylor bubbles is defined by the Taylor bubble velocity, influenced by the flow distribution coefficient (C0). This research collates a vast database of Taylor bubble velocity and C0 at different flow inclination angles, assesses current models, and introduces a unified C0 model. It’s observed that the physics of the flow distribution coefficient in downward flow differs significantly from upward flow. Overall, C0 experiences two transitions influenced by pipe inclination. The new model successfully represents this behavior in different inclination angles, including downward flow. Validation shows that the model outperformed existing ones, having an average error of 4.75% and a standard deviation of 8.03%.

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Section: Taylor Bubble Physical Behaviorsupporting

confidence: 57%

Investigation of Taylor Bubble Behavior in Upward and Downward Vertical and Inclined Flows

Aql,

Al-Safran

2023

Preprint

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“…Rosero et al [27] complemented the quantitative analysis of Celis et al on the dynamics of small and large bubbles in expansions and contractions with a detailed description of the physical mechanisms that lead to the fragmentation and merging of bubbles. Rodrigues et al [28] observed that the gas accumulation tends to grow at low flow velocities.…”

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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“…Studies that addressed the primary instability of the stratified flow with a smooth interface are listed in Table S1 of supplementary material. The applied experimental techniques include visual observations recorded by a high speed camera (Taitel and Dukler, 1976;Weisman et al, 1979;Andritsos and Hanratty, (1987); Trallero et al, 1997;Nädler and Mewes, 1997;Angeli and Hewitt, (1999); Barnea et al, (1980Barnea et al, ( ), (1982; Lioumbas et al, (2005); Wegmann and von Rohr, (2006); Vielma et al, (2007); Angeli, (2006), (2012); Kumara et al, (2010); Rodrigues and Baldani (2012); Ibarra et al (2015); Ribeiro et al (2019); Deendarlianto et al, (2019), Rodrigues et al, (2019); Yang et al, 2021), conductance probes (Angeli and Hewitt, 2000;Lioumbas et al, (2005); Al-Wahaibi and Angeli, (2006); Vielma et al, (2007), Totzi and Andritsos, 2013;Edomwonyi-Out and Angeli, (2015); Ayati et al, (2016)), particle image velocimetry, PIV (Kumara et al, (2010); Birvalski et al, (2014); Ayati et al, (2016); Vollestad et al, (2018)), stereoscopic particle image velocimetry, SPIV (Fernandes et al, (2018); Ng et al, (2018)) laser induced fluorescence, LIF (Fernandes et al, (2018)), wire-mesh sensors (Rodrigues et al, (2019)), hot wire anemometry (Ayati et al, (2016)), optical probes (Fernandes et al, (2018)), cap...…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical study of primary instability of a two-phase stratified flow in a circular pipe

Nezihovski,

Barmak,

Gelfgat

et al. 2024

Preprint

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The onset of the primary instability of two-phase air-water stratified flow in a circular pipe was studied experimentally by two independent non-intrusive techniques. The techniques analyze the steady or oscillatory response of either a laser beam passing through the air-water interface, or of an echo of an ultrasound wave reflected from the interface. The experiments are accompanied by linear stability analysis performed in both Cartesian and bipolar coordinates, thus yielding two independently obtained numerical results for comparison. The critical values of the phases’ superficial velocities corresponding to the flow primary instability calculated numerically by the two independent methods agree well with each other. The computed stability diagram shows that instability sets in owing to long-wave disturbances at large holdups, while at smaller holdups, the most unstable perturbations appear as finite-length (short) waves. A comparison of the experimental and numerical results shows a good agreement for the long-wave instability. For the short-wave instability, the measured critical superficial velocities are below the computed ones, while the frequencies found experimentally for supercritical oscillatory flow states agree with the numerical predictions. Several additional peaks in the frequency spectra are observed in the experiments. By comparing these frequencies with the numerical spectra, we argue that they correspond to stable eigenmodes with close to zero decay rates, which can be triggered either by non-linear mechanisms, or become unstable because of experimental imperfections.

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Experimental analysis of downward liquid-gas slug flow in slightly inclined pipes

Cited by 21 publications

References 56 publications

Investigation of Taylor Bubble Behavior in Upward and Downward Vertical and Inclined Flows

Investigation of Taylor Bubble Behavior in Upward and Downward Vertical and Inclined Flows

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

Experimental and numerical study of primary instability of a two-phase stratified flow in a circular pipe

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