Two-phase pressure drops and flow pattern observations in 90° bends subject to upward, downward and horizontal arrangements

Hsu, Li Chieh; Chen, Ing Youn; Chyu, Chien Min; Wang, Chi-Chuan

doi:10.1016/j.expthermflusci.2015.06.012

Cited by 17 publications

(10 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…14 in the vertical elbow with D * =21mm at different times. The phenomenon of flow reversal and bubble separation were reported by Hsu et al [19] in 90 • round elbows and Wang et al [18] in 180 • bends at velocities higher than ours because the secondary flow, which is the main cause for this phenomenon, increases with the decrease of curvature radius of the elbow for the same flow conditions, as also mentioned by Wang and Mayinger [44] and Wang at al. [17].…”

Section: Horizontal To Vertical Upward Orientationsupporting

confidence: 82%

“…Chen et al [16] and Wang et al [11,17,18] showed that the flow regime changes suddenly from stratified to annular through horizontal and vertical 180 • bends with low curvature ratios because the centrifugal forces overcome the effect of gravity. The phenomena of reverse flow and slug division and merging in the vertical configuration were reported by Wang et al [18] for 180 • bends and Hsu et al [19] for 90 • round elbows. Milan et al [20] recently discovered the membrane flow, a new two-phase flow structure in vertical downward water-air flows through straight pipes that may develop downstream of phase-mixers as a result of coalescence of bubbles and liquid-slug shrinkage.…”

Section: Introductionmentioning

confidence: 61%

See 1 more Smart Citation

Water–air flow in straight pipes and across 90∘ sharp-angled mitre elbows

Al-Tameemi

Riccó

2019

International Journal of Multiphase Flow

View full text Add to dashboard Cite

Section: Horizontal To Vertical Upward Orientationsupporting

confidence: 82%

Section: Introductionmentioning

confidence: 61%

Water–air flow in straight pipes and across 90∘ sharp-angled mitre elbows

Al-Tameemi

Riccó

2019

International Journal of Multiphase Flow

View full text Add to dashboard Cite

“…The gas phase flows with the inner wall of the bend, and the liquid phase flows with the outer wall of the bend during horizontal to upward vertical two-phase flow . If the flow is moving from upward vertical to the horizontal direction, the liquid tends to reside with the inner wall, and gas goes to the outer wall due to the lower density; the same is the case for the horizontal to the vertically downward direction. , The upstream petroleum pipeline flow usually consists of gas, oil, and water. The simultaneous flow of phases adopts various flow patterns depending on the flow rate of fluids, physical properties, and the inner diameter of the pipe. ,− The three-phase flow through the 90° bends is much more complicated because of the addition of another liquid phase.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Three-Phase Flow Regime Transition in a Large Diameter 90° Bend and the Resultant Pressure Drop Prediction

Yaqub

Pendyala

2022

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

The use of 90° bend is common in pipeline networks to connect the horizontal and vertical pipes in different orientations. The gas–oil–water flow pattern experiences a significant change while flowing through the bend. The centrifugal and gravitational forces influence the upstream flow pattern and transform it into a different type in the downstream pipe. An experimental study is conducted to identify flow pattern transformation in horizontal to vertical upward bend having an (R/d) ratio of 1. Each phase velocity affects the flow patterns; hence, the superficial velocities have been varied in the range of 0.5–5, 0.08–0.36, and 0.08–0.36 m/s for gas, oil, and water, respectively. The three-phase flow patterns in the bend’s horizontal and vertical legs have been identified and discussed in detail. Flow regime transition maps are plotted, and the variation in flow patterns with the change in superficial velocities of fluids has been analyzed. The pressure drop has been analyzed, and the prediction model for total pressure drop across the bend has been developed. The comparison of the experimental and predicted results showed close agreement.

show abstract

“…Hsu et al 21 conducted two-phase flow experiments in 90°u pward, downward, and horizontal pipes. The inner diameters of the pipes were 5.5 and 9.5 mm, and the curvature ratio was 2R/D (5.4 and 4.2, respectively).…”

Section: Introductionmentioning

confidence: 99%

Experimental and Simulation Studies on the Slug Flow in Curve Pipes

et al. 2021

View full text Add to dashboard Cite

This work focuses on the two-phase slug flow in the curve pipe, which is very common in oil/gas wells. In terms of oil and gas production, the unstable slug flow may cause several problems and reduce production. In the present work, slug flow experiments were conducted in several curve pipes for varying inflow angles and gas−liquid velocity ratios. The real-time pressure was measured at the curve pipe using the Rosemount pressure gauges, and the liquid holdup was measured using the conductivity sensors, which were used to calculate the slug length. Then, we define the dimensionless slug length φ D = L S /D (the ratio of slug length L to pipe diameter D), which can make the slug analysis free from the influence of different pipe diameters; φ D is also used to analyze the change in the slug flow state. The experimental results show that the dimensionless slug length φ D increases with the increase in the pipe curvature; φ D first decreases and then increases with the increase in the inflow angle; φ D also increases with the increase in the gas−liquid velocity ratio. This study adopts a dynamic slug flow model to simulate the well completion and the throttle cases under field conditions based on the hydraulic similarity principle. The pressure and liquid holdup results show that the large-scale segregated completion will lead to decreasing flow instability and the decrease in throttle opening will also lead to the decrease in flow instability.

show abstract

Two-phase pressure drops and flow pattern observations in 90° bends subject to upward, downward and horizontal arrangements

Cited by 17 publications

References 14 publications

Water–air flow in straight pipes and across 90∘ sharp-angled mitre elbows

Water–air flow in straight pipes and across 90∘ sharp-angled mitre elbows

Experimental Investigation of Three-Phase Flow Regime Transition in a Large Diameter 90° Bend and the Resultant Pressure Drop Prediction

Experimental and Simulation Studies on the Slug Flow in Curve Pipes

Contact Info

Product

Resources

About