Evaluation of drift-velocity closure relationships for highly viscous liquid-air slug flow in horizontal pipes through 3D CFD modelling

Valdés, Juan Pablo; Pico, Paula; Pereyra, Eduardo; Ratkovich, Nicolás Ríos

doi:10.1016/j.ces.2020.115537

Cited by 8 publications

(6 citation statements)

References 32 publications

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“…(2018) and Valdés et al. (2020). These investigators assessed the performance of previous correlations against experimental data (Livinus et al.…”

Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

“…Various Froude number correlations were addressed in Livinus et al (2018) and Valdés et al (2020). These investigators assessed the performance of previous correlations against experimental data (Livinus et al 2018) and numerical simulations (Valdés et al 2020). They argued that the correlations barely account for the combined effects of liquid viscosity and surface tension under specific operating conditions and that a more general model is needed.…”

Section: Introductionmentioning

confidence: 99%

“…2018) and numerical simulations (Valdés et al. 2020). They argued that the correlations barely account for the combined effects of liquid viscosity and surface tension under specific operating conditions and that a more general model is needed.…”

Section: Introductionmentioning

confidence: 99%

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Dynamics of elongated bubbles in slightly inclined pipes with viscous fluids

Boucher,

Karp,

Belt

et al. 2023

J. Fluid Mech.

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In this work, the relationship between the velocity of an elongated bubble and its shape is investigated, in the case where the elongated bubble flows in a viscous liquid initially at rest in a pipe. The velocity, expressed as a Froude number, depends on the angle of the inclined pipe, the Eötvös number and the buoyancy Reynolds number. The diameter of the pipe and the surface tension being fixed, the Eötvös number remains constant; this study focuses on the dependence of the velocity on the pipe inclination angle and the viscosity of the liquid. The velocity of the elongated bubble was measured for different angles between 0 and 15 degrees and for liquid viscosities 10 to 200 times that of water. As the velocity of elongated bubbles depends closely on their shape, shadowgraphy coupled with particle image velocimetry was used. The results show that the velocity of the elongated bubbles is highly sensitive to the inclination angle of the pipe and to the viscosity of the liquid, particularly for low pipe inclinations and large viscosities. In the layer of liquid located downstream of the elongated bubble, laminar flow develops rapidly in the liquid, resulting from a balance between gravity and friction at the wall. The identification of the position of the stagnation point close to the nose of the elongated bubble and the curvature of the interface at this point helps to explain why the velocity of the elongated bubble decreases for low angles and high viscosities.

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“…(2018) and Valdés et al. (2020). These investigators assessed the performance of previous correlations against experimental data (Livinus et al.…”

Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Dynamics of elongated bubbles in slightly inclined pipes with viscous fluids

Boucher,

Karp,

Belt

et al. 2023

J. Fluid Mech.

View full text Add to dashboard Cite

show abstract

“…Thus, the accurate simulation of the physics of the flow field using CFD can be used to give a better understanding of the transition between the different flow patterns [16,17]. 3D CFD simulations have also been used to directly provide input for the development of closure relationships [18]. Thus, the use of CFD enables the user to perform accurate predictions on the detailed dynamics of two-phase flow without the need to invest in expensive in-situ experimental tests [19].…”

mentioning

confidence: 99%

Comparative Study of CFD and LedaFlow Models for Riser-Induced Slug Flow

et al. 2020

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The goal of this study is to compare mainstream Computational Fluid Dynamics (CFD) with the widely used 1D transient model LedaFlow in their ability to predict riser induced slug flow and to determine if it is relevant for the offshore oil and gas industry to consider making the switch from LedaFlow to CFD. Presently, the industry use relatively simple 1D-models, such as LedaFlow, to predict flow patterns in pipelines. The reduction in cost of computational power in recent years have made it relevant to compare the performance of these codes with high fidelity CFD simulations. A laboratory test facility was used to obtain data for pressure and mass flow rates for the two-phase flow of air and water. A benchmark case of slug flow served for evaluation of the numerical models. A 3D unsteady CFD simulation was performed based on Reynolds-Averaged Navier-Stokes (RANS) formulation and the Volume of Fluid (VOF) model using the open-source CFD code OpenFOAM. Unsteady simulations using the commercial 1D LedaFlow solver were performed using the same boundary conditions and fluid properties as the CFD simulation. Both the CFD and LedaFlow model underpredicted the experimentally determined slug frequency by 22% and 16% respectively. Both models predicted a classical blowout, in which the riser is completely evacuated of water, while only a partial evacuation of the riser was observed experimentally. The CFD model had a runtime of 57 h while the LedaFlow model had a runtime of 13 min. It can be concluded that the prediction capabilities of the CFD and LedaFlow models are similar for riser-induced slug flow while the CFD model is much more computational intensive.

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