A model for predicting two-phase flow patterns transitions in an annulus: Inclinations from horizontal to near-vertical

Oliveira, Marciellyo; Martins, Márcio Ferreira; Belich, H.; Amorim, Leandro

doi:10.1016/j.ces.2021.117379

Cited by 5 publications

(2 citation statements)

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“…Moreover, the longitudinal velocity v z = v z r ð Þ, hence on each tube edges the term rv z v z and À2m ∂v z ∂z in equation ( 7) will be similar, therefore both terms can be canceled out. combining, equations ( 6) and ( 7) into equation (5), equation ( 8) arises.…”

Section: Shear Stress Analysismentioning

confidence: 99%

“…They found that the transition from a flow pattern to another require a high liquid and low gas superficial velocity in the case of eccentric annulus in comparison to concentric one. de Oliveira et al 5 provided a new model to predict two-phase flow patterns in a concentric annular channel which considers horizontal to near-vertical inclinations. The proposed model takes into account the approach of Taitel and Dukler 6 that was developed for straight pipe configuration and it was adapted to the geometrical conditions of the annulus.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Two-phase flow in a vertical concentric annulus: Pressure drop and flow configuration

Zeghloul

Al–Sarkhi

Ghendour

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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This paper presents experimental investigation of flow configurations and pressure drop of single-phase water flow and two-phase air-water flow in a vertical annulus. The annular test section had a concentric geometry with a casing and tubing diameter of 50 and 33.7 mm, respectively. The superficial velocity conditions of the liquid and gas were ranged 0.08–1.56 and 0–3.56 m/s, respectively. The combination of these superficial velocities produces the bubbly, slug and churn flow regimes. The identification of the flow patterns shows that the Mishima and Ishii model is the most relevant to highlight the flow transition. The measured friction factors were compared to prediction models from the literature. It was deduced that the model proposed by Gunn and Darling underestimates the liquid friction factor in the annulus. The measured pressure drops and the dimensionless pressure gradient evolution exhibits different slopes that characterize each flow pattern. The standard deviation and structure frequency describe specific ranges for each flow pattern. These two parameters can also be used for the prediction of flow patterns.

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Section: Shear Stress Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%