Effect of T-junction diameter ratio on stratified-wavy flow separation

Saieed, Ahmed; Pao, William; Hashim, Fakhruldin Mohd

doi:10.1016/j.jngse.2018.01.015

Cited by 27 publications

(28 citation statements)

References 19 publications

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“…The flow assurance multiphase flow facility employed in this study was a modified form that was described by Saieed [14]. The flow facility is capable of handling air and water as working fluid, the properties of air and water are listed in Table. 1.…”

Section: Methodsmentioning

confidence: 99%

“…The process of phase separation in T-junction is a complex process because of the involvement of a large number of parameters that include geometrical parameters, flow parameters, and fluid properties. For the geometry alone there are eight parameters which are required, i.e., the diameter of main, run and branch arm, the length of main and branch arm, orientation angles of main, run and branch arm [13,14]. A lot of research literature is available on altering the diameter ratio [15,16], branch orientation [17], inlet flow regimes like stratified, stratified-wavy, and slug flow [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

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Experimental investigation of multiphase separation in different flow regimes through T-junction with an expander section

Memon

Pao

Hashim

et al. 2019

JMES

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The experimental data for phase separation of the air-water mixture in a T-Junction with the expander section after the branch arm is presented in this work. The main and run arms of the T-junction are directed along the horizontal plane with the branch arm positioned in the vertical plane. The diameter of the main arm is 74 mm, with diameter ratio(s) of, 0.67, and 0.33 in relation to branch arm. At the inlet section of the T-junction, the flow regimes generated were stratified, stratified wavy and slug flow. At the inlet, the air and water superficial velocities are in the range of 0.25 - 0.140 m/s and 0.14-0.78 m/s respectively. The effect of the expander section after the branch arm, the air superficial velocity USA and water superficial velocity USw on liquid carryover (WL3/WL1)max in branch arm have been studied. Based on the experimental data obtained for T-junction with expander section, complete phase separation of air and water was observed in stratified and stratified wavy flow for all superficial velocities and improved phase separation for slug flow. In slug flow, increasing the liquid superficial velocity improves the phase separation but increasing the gas velocity decreases the phase separation. Finally, the volume weighted phase in this new T-junction design is compared with the phase separation data of a simple T-junction.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental investigation of multiphase separation in different flow regimes through T-junction with an expander section

Memon

Pao

Hashim

et al. 2019

JMES

View full text Add to dashboard Cite

show abstract

“…Previous research on T-junction used Liquid Carryover Threshold (LCT) and Peak Liquid Carryover (PLC) as a criterion to assess split efficiency [18,23,24]. Using Figure 7 as an illustration, LCT is the liquid carryover's onset, in which average water volume fraction at branch outlet surface is nonzero (Fw > 0).…”

Section: Dimensionless Area Under the Separation Efficiency Curvementioning

confidence: 99%

Numerical simulation of two-phase separation in T-junction with experimental validation

Tran

Memon

Saieed

et al. 2018

JMES

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Liquid carryover in T-junction due to splitting nature of two-phase flow causes serious issues for downstream equipment which is not designed to handle excessive liquid. In this paper, the phenomena of liquid carryover in T-junctions were analyzed using the Volume of Fraction (VOF) together with the k-ε turbulence model. T-junction separation efficiency was measured through mass flow rate fraction of air and water between the branch and main arm over a range of diameter ratios 0.6 to 1.0, water superficial velocity 0.186 to 0.558 m/s and air superficial velocity 4 to 8 m/s. The results showed simulation model was successfully validated with average deviation of less than 5% and can be used to predict phase split of slug flow in T-junction. The numerical model confirmed the significant influence of diameter ratio and superficial velocities of air and water on phase split. Reduced T-junction delivers better separation performance compared to regular T-junction. In slug flow regime, T-junction’s performance can be improved by either decreasing air velocity or increasing water velocity. A new dimensionless parameter, namely the area under the curve of separation efficiency (S), was proposed and proved as a qualified judging criteria for evaluating phase separation efficiency of T-junctions.

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“…Depending on the inlet configuration, T-junctions can be classified into two main classes, and thus there are branching and impacting T-junctions [2]. In case of branching Tjunctions, the mixture phases flow through their main arm and branching out upon reaching the junction, while in impacting T-junctions the incoming fluids are introduced from the side arm of the junction [3].…”

Section: Introductionmentioning

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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Effect of T-junction diameter ratio on stratified-wavy flow separation

Cited by 27 publications

References 19 publications

Experimental investigation of multiphase separation in different flow regimes through T-junction with an expander section

Experimental investigation of multiphase separation in different flow regimes through T-junction with an expander section

Numerical simulation of two-phase separation in T-junction with experimental validation

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

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