Statistical characterization of slug flow in horizontal pipes

Nydal, Ole Jørgen; Pintus, Sandro; Andreussi, Paolo

doi:10.1016/0301-9322(92)90027-e

Cited by 166 publications

(76 citation statements)

References 10 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: 93%

“…In the present work, regular slugs are identified from the PDF of void fraction forms suggested by [23]. PDF functions are bimodal for slug flow illustrated in Figure 4.…”

Section: P a G Ementioning

confidence: 79%

“…From an examination of these figures it is observed that the predicted values of [23] exhibit the greatest discrepancy to the experimental data across all of the liquid superficial velocities considered. The closest agreement between experiment and predicted values is found employing the [26] correlation.…”

Section: Figure 20mentioning

confidence: 88%

“…This phenomenon may be explained in that the presence of more liquid may be expected to lead to the generation of more slugs as the gas superficial velocity increases. proposed by [5] and [23], and [25][26].…”

Section: Figure 20mentioning

confidence: 97%

“…A series of investigators [20][21][22][23] have reported stable slug lengths of between 15-40 pipe diameters in horizontal and slightly inclined pipes. All of these studies concluded that the slug length is fairly insensitive to the gas and liquid flow rates, and depend principally on the pipe diameter.…”

Section: Slug Lengthmentioning

confidence: 99%

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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: 93%

“…In the present work, regular slugs are identified from the PDF of void fraction forms suggested by [23]. PDF functions are bimodal for slug flow illustrated in Figure 4.…”

Section: P a G Ementioning

confidence: 79%

Section: Figure 20mentioning

confidence: 88%

Section: Figure 20mentioning

confidence: 97%

Section: Slug Lengthmentioning

confidence: 99%

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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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Slug flow characterization in horizontal annulus

Eyo

Lao

2019

AIChE Journal

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In order to characterise slug flows in annuli channels and highlight the effect of the eccentricity on the flow behaviours, experiments were conducted in two horizontal annuli setups (i) concentric and (ii) fully eccentric using air and water as the testing fluids. The range of air and water superficial velocities investigated were 0.45-3.49 m/s and 0.15-2.77 m/s respectively. Slug parameters measured using conductance probes designed for this study include slug length, translational velocity, slug frequency and slug holdup. It is found that the slug translational velocity is unaffected by the annulus eccentricity, however parameters including slug frequency, slug holdup and slug lengths have a higher value in the fully eccentric annulus when compared with the concentric one. We introduced a new definition of hydraulic diameter, which reconciles the correlation between the dimensionless mean slug length and the mixture velocity of the horizontal annuli with different setups.

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