Intermittent two phase flow in horizontal pipes: Predictive models

Nicholson, M.K.; Aziz, Khalid; Gregory, G.A.

doi:10.1002/cjce.5450560601

Cited by 194 publications

(96 citation statements)

References 3 publications

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“…Kouba The observed non-zero intercept of the line with the y-axis shows that there is a drift velocity component of bubbles. This observation supports the conclusions of [4] and [7][8] that a drift velocity exists for the horizontal case and that it may even exceed its value in the vertical case.…”

Section: Determination Of Characterization Parameterssupporting

confidence: 90%

“…In contrast, other investigators [4] and [16][17], observed significant drift velocities in horizontal pipes. Weber [7] considered a force balance on the nose of a stationary bubble to explain the absence of drift velocities in horizontal pipes.…”

Section: Slug Velocitymentioning

confidence: 69%

“…Interestingly, the observed slug lengths are in the order of 8 to 46 pipe diameters, and appear relatively independent of the flow conditions. A number of other investigators [4], [39], and [43][44] have observed a fairly constant slug length of between 10 to 40 pipe diameters for similar set of flow conditions. According to [5] and [14], slug frequency may be defined as the average number of slugs per unit time as seen by a stationary observer.…”

Section: Figure 20mentioning

confidence: 72%

“…Several investigators have developed flow pattern maps and models to characterize the various flow patterns that may be adopted by two-phase oil and gas flow mixtures, for instance references [2], [3][4][5][6] and [7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

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: Determination Of Characterization Parameterssupporting

confidence: 90%

Section: Slug Velocitymentioning

confidence: 69%

Section: Figure 20mentioning

confidence: 72%

Section: Introductionmentioning

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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“…Certain authors noted that the average length of the slugs varies little according to the velocity of mixture for air-water flow in horizontal pipeline. As an example, Dukler and Hubbard [22] then Andreussi and Bendiksen [23] observed that varies from 12 to 24d, of 12 until 30d for Nicholson et al [24], Nydal et al [25] finds that varies from 15 until 20d, it is 13,63d until 29,31d for Salhi [19]. In our case, the average length of a slug varies between 12,77d and 33,24d, thus our results are slightly higher than those of Nicholson et al [24] and Salhi [19].…”

Section: Slug Lengthmentioning

confidence: 96%

Experimental investigation of slug pattern in a horizontal two-phase flow

Belgacem

Salhi

Si‐Ahmed

et al. 2013

Computational Methods in Multiphase Flow VII

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Gas-liquid two-phase flow occurs in a wide range of engineering applications in various industrial fields. For example, without being exhaustive, in the chemical and process industry, a two-phase flow is encountered in boilers, condensers, evaporators and reactors. In the petroleum industry, a two-phase flow is observed during the production and transportation of oil and gas.Among flow patterns encountered in field operations, the slug flow appears to be dominant in horizontal and near horizontal pipelines, and is, unfortunately, the most complicated one. It is characterized by an alternate flow of liquid slugs and gas pockets, resulting in inherently unsteady hydrodynamic behavior. All the important design variables, such as gas and liquid velocity profiles, liquid holdup distribution and pressure drop vary axially and radially and exhibit fluctuations, even when the inlet liquid and gas flow rates are constant. This makes prediction of slug flow characteristics complex and challenging. This paper is therefore devoted to slug flow in horizontal pipelines and attempts to address the above-cited points. Specifically, the study aims to develop a map of flow regimes then acquire pertinent slug flow data. For that purpose, an experimental test rig was built-up to examine the process of slug initiation in a 40 mm i.d and a 14 m length horizontal pipeline. Two-phase cocurrent air-water pressure gradients were measured. Most of the data recorded correspond to the slug flow region, noting then rapid fluctuations in pressure. Data on slug initiation, pressure variation as well as slug frequency and length are investigated and reported hereafter.

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Transient Behaviour of Two‐Phase Slug Flow in Horizontal Pipes

Grotjahn¹,

Mewes

2000

Transient Phenomena in Multiphase and Multicomponent Systems

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Intermittent two phase flow in horizontal pipes: Predictive models

Cited by 194 publications

References 3 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

Experimental investigation of slug pattern in a horizontal two-phase flow

Transient Behaviour of Two‐Phase Slug Flow in Horizontal Pipes

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