The Effect of Pressure on Slug Frequency in Two-Phase Horizontal Flow

Manolis, Ilias; Mendes-Tatsis, M.A.; Hewitt, Geoffrey F.

doi:10.1016/b978-0-444-81811-9.50035-4

Cited by 31 publications

(22 citation statements)

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“…It shows that the average slug frequency is fairly weakly dependent on the gas superficial velocity for all of the liquid superficial velocities examined. However, the average slug frequency is clearly observed to increase as the liquid superficial velocities increase, which confirms the findings of Manolis et al [45]. 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.…”

Section: Figure 20supporting

confidence: 80%

“…Figure 28 A plot of dimensionless frequency based on liquid superficial velocity against Lockhart-Martinelli parameter. 40 mm - [46]; 42 mm - [6]; 50 mm - [47]; 53 - [23]; 78 mm - [45]; 300 - [48]; 95 mm - [49] Table captions: Table 1 Summary of fully developed slug frequency models Table 2 Properties of the fluids and dimensionless numbers at1 bar and at the operating temperature of 20 o C Table 3 Measurement uncertainties Table 4 A plot of the PDF of void fraction measured at the three transducer locations along the length of the horizontal pipe downstream of the gas-liquid mixing section.…”

Section: Discussionmentioning

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: Figure 20supporting

confidence: 80%

Section: Discussionmentioning

confidence: 99%

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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“…This behaviour might be attributed to the observed changes in the flow pattern associated with a change in the liquid superficial velocity. These observations supported the findings of previous studies in horizontal gas -liquid flow including Hubbard (1965), Taitel and Dukler (1977), Jepson and Taylor (1993), Manolis et al (1995). …”

Section: Slug Frequency Determination Using Psdsupporting

confidence: 82%

Experimental study of the hydrodynamic behaviour of slug flow in a vertical riser

Abdulkadir

Hernández-Pérez

Lowndes

et al. 2014

Chemical Engineering Science

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“…Similar trends were noticed for comparisons between experimental and predicted slug frequencies performed for other superficial liquid velocities. Slug frequency correlations developed by Gregory and Scott [7], Heywood and Richardson [8], Nydal [4] and Manolis et al [9] perform poorly because they all fail to account for the effect of liquid viscosity. These empirical correlations are based on horizontal slug flow tests with gas and low viscosity liquids (typically water or kerosene) where the effects of liquid viscosity are minor.…”

Section: Comparison Of Experimental Slug Frequency Against Existing Ementioning

confidence: 99%

Application of the gamma radiation method in analysing the effect of liquid viscosity and flow variables on slug frequency in high viscosity oil-gas horizontal flow

Okezue¹

2013

Computational Methods in Multiphase Flow VII

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Published experimental observations of high viscosity liquid-gas horizontal flows have indicated that hydrodynamic slug flow is the commonest flow regime encountered over a wide range of flow conditions. Since hydrodynamic slugging generates high pressure fluctuations capable of damaging production pipelines, it is necessary to understand the complex characteristics of high viscosity slug flow regime through the analysis of one of its key parameters namely, slug frequency.Investigating slug parameters is crucial, especially when existing slug flow models used in the Petroleum Industry are not suitable for predicting the behaviour of high viscosity oil-gas flow. This is because most existing empirical correlations for predicting slug parameters are based on low viscosity liquid-gas flows which have different hydrodynamic features compared to high viscosity liquid-gas flows.In Cranfield University, an experimental investigation of high viscosity oil-air flow was performed to study the effect of liquid viscosity and flow variables on hydrodynamic slug flow. Experiments were conducted at liquid superficial velocities (V so ) and gas superficial velocities (V sg ) ranging from 0.06 m/s to 2.0 m/s and 0.0 m/s to 4.0 m/s respectively. For each experimental run, a singlebeam gamma densitometer was used to measure slug frequency. The effect of liquid viscosity (μ) on the measured slug frequency was investigated for the range of 1100 cP to 4000 cP. When compared against measured high viscosity slug frequency data, none of the existing empirical correlations used were able to produce accurate predictions. The predicted results tend to diverge from experimental data by several orders of magnitude. Given this context, a new Computational Methods in Multiphase Flow VII 447 empirical correlation for slug frequency was proposed. The new empirical slug frequency correlation was compared against an independent experimental dataset. The comparison indicated that the new empirical correlation performed better than existing correlations in predicting slug frequency of high viscosity liquid-gas flows.

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The Effect of Pressure on Slug Frequency in Two-Phase Horizontal Flow

Cited by 31 publications

References 10 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 study of the hydrodynamic behaviour of slug flow in a vertical riser

Application of the gamma radiation method in analysing the effect of liquid viscosity and flow variables on slug frequency in high viscosity oil-gas horizontal flow

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