Evaluating the two-phase flow development through orifices using a synchronised multi-channel void fraction sensor

Almalki, Naief; Ahmed, Wael H.

doi:10.1016/j.expthermflusci.2020.110165

Cited by 9 publications

(3 citation statements)

References 19 publications

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“…The pressure drop in the slug body region consists of the pressure drops from the mixture layer and the water layer and can be determined from Equation (5). The pressure drop in the liquid film region includes the pressure drops of the mixture layer, the water layer, and the gas pocket region, given in Equation (6). The corresponding geometrical parameters are illustrated in Figure 9.…”

Section: 𝐿 𝑈 𝑣 𝑆𝐿 = 𝐿 𝑆 𝐻 𝐿𝑆 𝑣 𝐿𝑆 + 𝐿 𝐹 𝐻 𝐿𝐹 𝑣 𝐿𝐹mentioning

confidence: 99%

“…These restrictions are extensively employed in the field, to regulate flow rates or pressure in order to fulfill facility needs, ensure secure transportation, or generate more turbulence for flow measurement. Previous studies on the effects of restriction (or expansion) on fluid flow have been mainly focused on gas-liquid flow, such as [2][3][4][5][6], or oil-water flow, such as [7][8][9][10][11][12][13][14][15][16]. Some studies used computational fluid dynamics to study the oil-water flow through restrictions, such as [17].…”

Section: Introductionmentioning

confidence: 99%

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Modeling Pressure Gradient of Gas–Oil–Water Three-Phase Flow in Horizontal Pipes Downstream of Restrictions

Zhou,

Fan

2024

Energies

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Gas–oil–water three-phase slug flows in pipes commonly exist in the oil and gas industry as oil fields are becoming mature and water production is becoming inevitable. Although studies on multiphase flows in pipes have been ongoing for decades, most previous research has focused on gas–liquid or oil–water two-phase flows, with limited studies on gas–liquid–liquid flows. This leads to limited modeling studies on gas–liquid–liquid flows. One factor contributing to the complexity of the gas–liquid–liquid flow is the mixing between the oil and water phases, which have closer fluid properties and low interfacial tension. Restrictions or piping components play a crucial role in altering phase mixing. Unfortunately, modeling studies that consider the effects of these restrictions are limited due to the scarcity of experimental research. To address this gap, we conducted experimental studies on a gas–liquid–liquid flow downstream of a restriction and developed a new mechanistic modeling approach to predict the pressure gradient. Our model focuses on the flow pattern where the oil and water phases are partially mixed. This work emphasizes the modeling approach. The model evaluation results show that the model outperforms other existing models, with an average absolute relative error of 6.71%. Additionally, the parametric study shows that the new modeling approach effectively captures the effects of restriction size, water cut, and gas and liquid flow rates on the three-phase slug flow pressure gradient in horizontal pipes. Most previous slug flow modeling work assumes either a stratified flow or fully dispersed flow between the oil and water phases. This work provides a novel perspective in modeling a three-phase slug flow in which the oil and water phases are partially mixed. In addition, this novel approach to modeling the restriction effects on the pressure gradient paves the way for future modeling for different types of piping components or restrictions.

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Section: 𝐿 𝑈 𝑣 𝑆𝐿 = 𝐿 𝑆 𝐻 𝐿𝑆 𝑣 𝐿𝑆 + 𝐿 𝐹 𝐻 𝐿𝐹 𝑣 𝐿𝐹mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modeling Pressure Gradient of Gas–Oil–Water Three-Phase Flow in Horizontal Pipes Downstream of Restrictions

Zhou,

Fan

2024

Energies

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“…Therefore, investigations on two-phase flow through circular orifices mainly focus on measurement (McNeil 2000) or simulation (Roul and Dash 2012) of the pressure drop across the restriction. Averaged void fractions at different axial positions have been measured in slug/plug flows using ring-type impedance (Fossa and Guglielmini 2002) or capacitance (Almalki and Ahmed 2020) sensors. In horizontal annular flow, void fraction distributions have been measured in cross sections using optical probes (Salcudean et al 1983).…”

Section: Introductionmentioning

confidence: 99%

Horizontal annular flow through orifice studied by X-ray microtomography

et al. 2020

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An X-ray microtomography (µCT) system was adapted so that 3D scans of fixed horizontal or vertical test sections can be performed. The mobile µCT system has been applied to measure the local, time-averaged volume fraction distribution of developing annular air-water flow in a horizontal pipe with µm spatial resolution. Based on the volume fraction data the liquid film thickness profile is computed and the accumulation, stripping and renewal of the annular liquid film at a circular orifice is studied. The development length of the annular flow downstream of the orifice is evaluated based on the integral volume fraction and the change of the film thickness profile along the pipe axis. Both parameters give a consistent result, indicating that liquid film renewal can be judged based on integral measurement techniques in this case. Further, the detailed 3D data enables the validation of computational fluid dynamics codes based on phase-averaged variables such as the Euler-Euler approach. Graphic abstract

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Influence of a restriction on flow patterns, void fraction, and pressure drop in gas–liquid pipe flow

Alegría,

Enrique Ortiz-Vidal,

Álvarez-Pacheco

et al. 2024

Experimental Thermal and Fluid Science

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Evaluating the two-phase flow development through orifices using a synchronised multi-channel void fraction sensor

Cited by 9 publications

References 19 publications

Modeling Pressure Gradient of Gas–Oil–Water Three-Phase Flow in Horizontal Pipes Downstream of Restrictions

Modeling Pressure Gradient of Gas–Oil–Water Three-Phase Flow in Horizontal Pipes Downstream of Restrictions

Horizontal annular flow through orifice studied by X-ray microtomography

Influence of a restriction on flow patterns, void fraction, and pressure drop in gas–liquid pipe flow

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