Affecting the phase split at a large diameter T-junction by using baffles

Wren, E.; Azzopardi, B.J.

doi:10.1016/j.expthermflusci.2003.12.017

Cited by 46 publications

(41 citation statements)

References 13 publications

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“…Figure 5. Comparison of present numerical results with (A) Hong [13], and (B) Wren [10] experimental results for a vertically upwards side arm T-junction. Figure 5 shows the validation of the present model in comparison to Hong's [9] data for a 12 o'clock side arm configuration.…”

Section: Validation Of Model With Experimentsmentioning

confidence: 95%

“…The present model faced difficulties to reproduce the experimental results for side arm pointing at 3 and 6 o'clock positions, but efforts are still underway to investigate this further. The second validation example is taken from the experimental data of Wren [10]. In her experimental research, she analysed the phase separation capabilities of different diameter ratio (1 and 0.6) T-junctions with the side arm oriented at different angles from the horizontal plane.…”

Section: Validation Of Model With Experimentsmentioning

confidence: 99%

“…He stated that a reduction in the side arm diameter has two different effects which are the associated pressure drop, and the axial distance available for take-off. According to Wren [10], the main difference between a reduced and a regular T-junction is the pressure redistribution around the junction. For the same inlet conditions, the reduced side branch causes a higher pressure drop as compared to the uniform T-junction.…”

Section: Introductionmentioning

confidence: 99%

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Numerical investigation of side arm gas volume fraction in two phase T-junction

Saieed¹,

Pao²,

Hashim³

2016

J. MECH. ENG. SCI.

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T-junction is commonly installed at the offshore production header as a separator to tap produced gas for downstream process operation. A major issue in the T-junction is the liquid carryover, where excessive liquid flows into the downstream process equipment causing the platform to trip. The primary objective of the present study is to determine the effect of ratio of side arm to main arm diameters on passive separation performance in T-junction. The analysis was carried out using Eulerian Multiphase model from ANSYS Fluent 16.1. The boundary conditions chosen for the inlet and two outlets of the T-junction were velocity inlet and volume fraction outlet flow, respectively. Likewise, pressure velocity coupling was achieved by using SIMPLE coupling scheme. Three different side to main arm diameter ratio and side to main arm length ratio of 0.2, 0.6, and 1.0 were investigated, with different gas velocities variation and inlet gas saturation. Investigation found that the gas volume fraction in the side arm cannot go beyond 90% irrespective of the variation of parameters such as gas to liquid velocity ratio, diameter ratio, length ratio, and mass split ratio. It was found that the amount of gas exiting through the side arm decreases by decreasing the initial gas saturation and gas to liquid velocity ratio. However, by decreasing the mass split ratio, more gas ends up in side arm. Likewise, in terms of geometrical aspects, increasing the T-junction diameter ratio and reducing the length ratio causes an increase in extraction of gas into side arm. It was also noticed that the highest fraction of gas in side arm was achieved when the diameter ratio was 0.6. Therefore, it can be said that maximum amount of gas can be received in side arm when diameter ratio is around 0.6, initial gas saturation and velocity ratio are high, and mass split ratio is small. This paper discusses some of the most important parameters that are involved in partial phase separation in a T-junction. In order to have a more overall insight of the phase separation phenomena, it is required to explore the effects of inlet and outlet pressures, surface roughness of the pipe interior, angle between side and run arm, curvature radius at the junction, and the viscosity of the operating fluids.

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Section: Validation Of Model With Experimentsmentioning

confidence: 95%

Section: Validation Of Model With Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical investigation of side arm gas volume fraction in two phase T-junction

Saieed¹,

Pao²,

Hashim³

2016

J. MECH. ENG. SCI.

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“…All of their work was done with a vertically upward branch arm and they showed improved separation capabilities for the combined junctions. Wren [18] studied the effect of branch inclination on the phase split and concluded that when the outlet branch was inclined, the effect of gravity can be a factor that enhances the phase separation relative to a tee junction with a horizontal inlet and horizontal outlets. In order for a tee junction to be taken as a serious partial separator, Wren and Azzopardi [19] suggested a criterion of less than 10% by volume of liquid exiting with the gas and less than 10% by volume of gas exiting with the liquid stream.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of two-phase flow splitting in an equal-sided impacting tee junction with inclined outlets

Mohamed

Soliman

Sims

2011

Experimental Thermal and Fluid Science

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“…The uneven splitting of the gas-liquid phases across T-junction causes the problem for the downstream keeping the performance and efficiency in a declining trend. As in the case of evaporators, uneven distribution of phases in gas-liquid flow across T-junction will leave some branches to dry out and causing them to underperform in terms of reduced heat transfer [9][10][11]. However, this uneven distribution of the phases made the T-junction possible to be used as a partial phase separator [12].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of two-phase separation in a horizontal T-junction with vertical branch arm

Memon¹,

Pao²,

Hashim³

et al. 2019

JMES

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T-junctions are commonly used in offshore platforms and process industry. When two-phase flow passes through T-junction, separation of two-phases takes place. This separation of twophase flow through T-junction produces high liquid carry-over in the branch arm, causing breakdown of downstream equipment. In this experimental study, phase separation data have been obtained for air-water mixture flow through dividing T-junction with a pipe diameter of 74 mm and the branch arm is positioned vertically upward. T-junctions with diameter ratios of 1, 0.67, 0.5, and 0.27 were tested in the slug flow regime. The superficial velocities of air (JG1) were varied 0.20 -1.16 m/s and inlet water superficial velocities (JL1) were varied 0.40-0.53 m/s. The extraction ratio between branch arm and main arm (W3/W1) was varied between 0 to 1. It was observed that the phase separation efficiency of T-junction depends upon the diameter ratio, upstream superficial velocities of both phases -air and water. Finally, the experimental data have been compared against the predicted results obtained from the numerical correlations.

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Affecting the phase split at a large diameter T-junction by using baffles

Cited by 46 publications

References 13 publications

Numerical investigation of side arm gas volume fraction in two phase T-junction

Numerical investigation of side arm gas volume fraction in two phase T-junction

Experimental investigation of two-phase flow splitting in an equal-sided impacting tee junction with inclined outlets

Experimental investigation of two-phase separation in a horizontal T-junction with vertical branch arm

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