Effect of inclination on circumferential film thickness variation in annular gas/liquid flow

Geraci, G.; Azzopardi, B.J.; Maanen, H.R.E. van

doi:10.1016/j.ces.2007.02.044

Cited by 47 publications

(23 citation statements)

References 13 publications

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“…Figure 1 shows a schematic diagram of the experimental facility. This rig has been employed for a series of earlier published two-phase flow studies by [5] and [27][28][29]. The experimental test section of A more detailed technical description may be found in [15].…”

Section: Experimental Facilitymentioning

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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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: Experimental Facilitymentioning

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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“…Therefore, the variations in critical gas velocity with the inclination angle from these experiments are similar. Table 1 lists the experimental data measured by Geracia et al (2007), which were used to explain the correlation between the critical gas velocity and the inclination angle. Table 1 also lists the axial gravity component of the tube bottom film, which was calculated from the bottom film thickness.…”

Section: Effect Of the Inclination Angle On The Critical Gas Velocitymentioning

confidence: 99%

Experimental study on the critical gas velocity of liquid-loading onset in an inclined coiled tube

Wang

Guo

et al. 2016

Journal of Natural Gas Science and Engineering

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“…Only a few experimental results of stratified flows in inclined tubes were published (Fukano and Ousaka, 1989;Hetsroni et al, 2003;Geraci et al, 2007) and the results often contradict each other (Lips and Meyer, 2011a). However, in all these papers, the liquid-vapour interface has been found to have a high curvature.…”

Section: Hydrodynamic Modelling Of Gas-liquid Separated Flows In Inclmentioning

confidence: 99%

Stratified flow model for convective condensation in an inclined tube

Lips

Meyer

2012

International Journal of Heat and Fluid Flow

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Experimental data are reported for condensation of R134a in an 8.38 mm inner diameter smooth tube in inclined orientations with a mass flux of 200 kg/m²s. Under these conditions, the flow is stratified and there is an optimum inclination angle, which leads to the highest heat transfer coefficient. There is a need for a model to better understand and predict the flow behaviour. In this paper, the state of the art of existing models of stratified two-phase flows in inclined tubes is presented, whereafter a new mechanistic model is proposed. The liquidvapour distribution in the tube is determined by taking into account the gravitational and the capillary forces.The comparison between the experimental data and the model prediction showed a good agreement in terms of heat transfer coefficients and pressure drops. The effect of the interface curvature on the heat transfer coefficient has been quantified and has been found to be significant. The optimum inclination angle is due to a balance between an increase of the void fraction and an increase in the falling liquid film thickness when the tube is inclined downwards. The effect of the mass flux and the vapour quality on the optimum inclination angle has also been studied.

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Effect of inclination on circumferential film thickness variation in annular gas/liquid flow

Cited by 47 publications

References 13 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 on the critical gas velocity of liquid-loading onset in an inclined coiled tube

Stratified flow model for convective condensation in an inclined tube

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