Experimental and numerical evaluation of slugs in a vertical air–water flow

Jaeger, Jerome Wm.; Santos, Celso Murilo dos; Rosa, Leonardo Machado da; Meier, Henry França; Noriler, Dirceu

doi:10.1016/j.ijmultiphaseflow.2018.01.009

Cited by 17 publications

(8 citation statements)

References 26 publications

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“…However, it has been observed that the effect of gas superficial velocity on Taylor bubbles length is far stronger than liquid slug length [13]. According to Jaeger et al [40], slug frequency, the number of slug units passing through a certain location per time unit, is not significantly affected by gas superficial velocity. But, liquid superficial velocity has an strong impact on this parameter.…”

Section: Slug Regime 221 Phase Distribution In Axial Directionmentioning

confidence: 99%

Towards Understanding the Interfacial Structures of Non-developing Slug Flow in Vertical Pipes

Holagh¹,

Ahmed²

2022

International Conference on Fluid Flow, Heat and Mass Transfer

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Non-developing slug two-phase flows in vertical pipes are widely found in various industries. These flows are of a highly complex nature largely due to the deformability of the gaseous phase resulting in unstable interfacial flow structures at different flow regimes. Such complex interfacial structures strongly control the multiphase transport phenomena including energy, mass, and momentum transfer between the phases. Therefore, a clear understanding of the behaviour characteristics of these interfacial structures is critical to the optimum design of multiphase flow systems. This study briefly provides a review on the behaviour of the gas-liquid interfacial structures for the slug flow regime in co-current upward two-phase flows. This review founds that the interfacial structures of gas-liquid interface exhibit different shapes and behaviours in non-developed compared to the fully-developed regions of slug regime. The behaviour of these structures is found to be heavily influenced by gas injector design, pipe diameter, gas and liquid phase properties, and operating flow conditions. The review also showed that the interfacial structures have been widely studied in developed region, while they have remained less understood in the non-developed region. Also, the impact of liquid and gas phases' thermo-fluid properties (density, viscosity, and surface tension) and pipe diameter on the interfacial structures in this flow regime have received the least attention.

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Section: Slug Regime 221 Phase Distribution In Axial Directionmentioning

confidence: 99%

Towards Understanding the Interfacial Structures of Non-developing Slug Flow in Vertical Pipes

Holagh¹,

Ahmed²

2022

International Conference on Fluid Flow, Heat and Mass Transfer

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“…Employing mathematical models assessed by Jaeger [7], the Volume of Fluid (VOF) method was used to model the two-phase flow phenomenon and capture its timedependent behavior. The following equations (1,2) describe mass and momentum conservation:…”

Section: Mathematical Modelingmentioning

confidence: 99%

“…3Several discretization methods were available to solve this equation. However, Geometric Reconstruction (Geo-reconstruction) achieved great results [7] and it was applied as a scheme to represent the area of interaction between fluids with high precision. This scheme indicates the position of the interface in one element, converting the gas-liquid interface into a straight line.…”

Section: Mathematical Modelingmentioning

confidence: 99%

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CFD Study of Two-Phase Slug Flow Development in Horizontal Pipe

Santos¹,

Becker²,

Godoy³

et al. 2020

Anais Do SIMPROC

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Slug flow is an intermittent two-phase flow pattern characterized by gas and liquid flowing in the stratified form with unstable waves that grow to the upper part of the pipe. The purpose of this study is to determine the tube length for the flow development of a slug pattern using Computational Fluid Dynamics (CFD) technique. A horizontal geometry pipe with 7 m of length and 74 mm of internal diameter was build, where the inlet was set as a stratified flow. The superficial velocities applied were 10 m/s for air and 1 m/s for water. Results of water volume fraction profile show that the mathematical models were capable of predicting the slug flow behavior and the flow is fully developed in L/D  68. In conclusion, the 7 m pipe is suitable to study this flow pattern.

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“…The Volume of Fluid (VOF) was set as the multiphase model, while the closure of turbulence was achieved by utilising the Realizable k-ε turbulence model. The latter was employed based on its satisfactorily performance that in the meanwhile requires less computing power in comparison with other available turbulence models such as the Standard kω and the SST k-ω models constituting therefore a common practice according to literature [27,28], and due to the findings reported that the choice of the turbulence model affects less the accurate results in terms of predicting the phases' redistribution [29]. Concerning the discretization schemes, the Body Force Weighted scheme was used for the pressure discretization and the Compressive scheme for the volume of fluid, while the Second Order Upwind scheme was utilised for the remaining variables.…”

Section: Computational Modelmentioning

confidence: 99%

Effect of Diameter Ratio and Inclination Angle on Air-Water Separation Occurred at a Small Diameter T-Junction

Makrygiannis¹,

Margaris²

2020

Applied Engineering Letters

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The simple geometry configuration of T-junctions and their capability to act as partial phase separators, especially on offshore platforms, made them common pipeline system components in power and process industries. Moreover, in the pursuit of achieving better phase separation by controlling the maldistribution occurred in the component phases of a mixture at the junction, industries often utilise reduced T-junctions. Nevertheless, most of the published data in which industries was based on to adopt the previous configuration was relating on fully horizontal T-junctions with large main pipe diameters although T-junctions are rarely placed in a horizontal position in such industries, whilst the usage of small main pipe diameters could also lead to scaling down their size. In this regard, the present paper aimed to extend the available data by performing numerical analysis and studying both regular and reduced T-junctions with a small main pipe diameter, and upward inclination angles. It was observed that reduced Tjunctions performed worse in terms of phase separation compared to regular T-junctions for all inlet conditions applied and irrespective of the side arm inclination, whereas in case of regular T-junctions a superior separation performance was ensured for the inclined side arm at 30°.

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Experimental and numerical evaluation of slugs in a vertical air–water flow

Cited by 17 publications

References 26 publications

Towards Understanding the Interfacial Structures of Non-developing Slug Flow in Vertical Pipes

Towards Understanding the Interfacial Structures of Non-developing Slug Flow in Vertical Pipes

CFD Study of Two-Phase Slug Flow Development in Horizontal Pipe

Effect of Diameter Ratio and Inclination Angle on Air-Water Separation Occurred at a Small Diameter T-Junction

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