Holdup of the liquid slug in two phase intermittent flow

Barnea, Dvora; Brauner, Neima

doi:10.1016/0301-9322(85)90004-7

Cited by 215 publications

(90 citation statements)

References 12 publications

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“…It can be observed that for these conditions void fraction is almost insensitive to both the liquid and gas superficial velocities. This is in agreement with the findings of [23], [39] and [42]. Figure 16 compares the present data against values predicted by correlations proposed by Gregory and Scott [5], [13] and [18].…”

Section: P a G Esupporting

confidence: 92%

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Experimental study of the hydrodynamic behaviour of slug flow in a horizontal pipe

Abdulkadir

Hernández-Pérez

Lowndes

et al. 2016

Chemical Engineering Science

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Abstract:Despite the research efforts in the last decades, the dynamic behaviour of gas-liquid two-phase flows remains a challenging topic. This is due to the growing demand within the petroleum, process and nuclear industries. In particular, data on the behaviour of these flows in more industry relevant fluids are limited. This paper presents a summary of the experimental results on the hydrodynamic behaviour of slug flow using airsilicone oil mixture in a horizontal 67 mm internal diameter pipeline. A series of slug flow regime experiments were performed for a range of injected air superficial velocities (0.29 to 1.4 ms -1 ) and the liquid flows with superficial velocities of between 0.05 to 0.47 ms -1 . The translational Taylor bubble velocity and slug frequency were measured using two pairs of Electrical Capacitance Tomography (ECT) probes. The expected linear dependence of the translational Taylor bubble velocity on the mixture superficial velocity was confirmed.Pressure drop was measured using a differential pressure (dp) transducer cell. The void fractions in the liquid slugs and Taylor bubbles and slug and Taylor bubble lengths parameters were obtained from the processed data.The average total lengths of the observed slugs were of the order of 8 to 46 pipe diameters. The dimensionless Taylor bubble length is concluded to increase as the gas superficial velocity increases. The average slug frequency was observed to increase as the liquid superficial velocity increases but on the other hand was concluded to be fairly weakly dependent on the gas superficial velocity. The measured translational Taylor bubble velocities, void fractions in the liquid, and slug frequencies are presented and compared to data predicted by empirical models available in the literature. A comparative analysis of this and the previously published experimental data sets confirms good agreement.Key words: ECT, Taylor bubble, liquid slug, slug unit, frequency, void fraction 2 | P a g e Introduction:The determination of the multiphase flow regimes that may exist within pipelines is a key factor to the development of efficient oil and gas production systems. As oil and gas reserves are being depleted in developed fields, activity is shifting to harsher and less accessible environments. As offshore production moves into deeper waters farther offshore, the cost of constructing and operating fixed platforms with separation facilities becomes increasingly challenging. An alternative solution is to utilize subsea production systems which entail minimum offshore processing. The adoption of this method requires the simultaneous transport of produced fluids to land-based separation facilities, with minimal offshore treatment to reduce the undesirable effects as corrosion, wax and hydrates formation. Thus, an accurate prediction of the multiphase flow characteristics that may be experienced within these pipelines is therefore required to effect the safe and economic design and operation of these transportation systems.Slug flows are the most preva...

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Section: P a G Esupporting

confidence: 92%

“…These observations support the phenomena reported by Beggs and Brill [41] and [42]. The decrease on the other hand could be attributed to the fact that the slugs are completely frothy and as a consequence results in a decrease in frictional pressure gradient with an increase in gas superficial velocity.…”

Section: P a G Esupporting

confidence: 91%

Experimental study of the hydrodynamic behaviour of slug flow in a horizontal pipe

Abdulkadir

Hernández-Pérez

Lowndes

et al. 2016

Chemical Engineering Science

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“…For inclined pipes, the drift velocity is multiplied by sin b as proposed by Barnea and Brauner (1985). The dispersed bubble drift velocity, U 0 , in inclined slug flow is thus…”

Section: Modelmentioning

confidence: 99%

Translational velocities of elongated bubbles in continuous slug flow

Hout

Barnea

Shemer

2002

International Journal of Multiphase Flow

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The translational velocities of elongated bubbles in continuous slug flow were measured for various flow rates, pipe inclinations and pipe diameters. Measurements were carried out by cross-correlating the output signals of consecutive optical fiber probes and by image processing technique. In addition, the velocities of single elongated bubbles in a stagnant and in a flowing liquid were measured by the same techniques. For all cases the measured velocities were compared to appropriate correlations. The measured velocities of single elongated bubbles were in all cases predicted quite well by the correlations while the velocities in continuous slug flow, for certain cases, were considerably underpredicted. This discrepancy is ascribed to the influence of the dispersed bubbles in the liquid slug region. A simplified model is proposed to calculate the translational velocity in continuous slug flow. The results of the model compare well with the measured translational velocities of elongated bubbles in continuous slug flow.

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“…In addition, the¯ow conditions in their experiments are dierent from those in a real slug¯ow where the gas bubble moves relative to the pipe walls. Taitel et al (1980) and Barnea and Brauner (1985) assumed that the minimum stable slug length corresponds to the distance at which the liquid ®lm is absorbed by the slug. They viewed this process as a wall jet entering a large reservoir.…”

Section: Introductionmentioning

confidence: 99%

Averaged and time-dependent characteristics of the motion of an elongated bubble in a vertical pipe

Polonsky¹,

Barnea

Shemer

1999

International Journal of Multiphase Flow

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The motion of elongated (Taylor) bubbles in air±water vertical¯ow is studied by processing consecutive series of digitized video images. The shape of the elongated bubbles, as well as the velocities of the liquid±gas interfaces, are measured for various¯ow conditions. The bubble velocity variation caused by air expansion under the in¯uence of hydrostatic pressure gradient is measured and compared with model predictions. An oscillatory motion of the bubble bottom is observed. The frequency and the amplitude of these oscillations are studied as a function of bubble length and water¯ow rate. This information is essential for accurate modeling of developing gas±liquid slug¯ow. #

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Holdup of the liquid slug in two phase intermittent flow

Cited by 215 publications

References 12 publications

Experimental study of the hydrodynamic behaviour of slug flow in a horizontal pipe

Experimental study of the hydrodynamic behaviour of slug flow in a horizontal pipe

Translational velocities of elongated bubbles in continuous slug flow

Averaged and time-dependent characteristics of the motion of an elongated bubble in a vertical pipe

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