CFD modeling of two-phase annular flow toward the onset of liquid film reversal in a vertical pipe

Adaze, Ernest; Badr, H. M.; Al–Sarkhi, A.

doi:10.1016/j.petrol.2019.01.026

Cited by 19 publications

(8 citation statements)

References 17 publications

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“…This kind of recirculating flow is specially observed in thicker liquid film which corresponds to higher capillary number. Recirculation of flow within the film zone was observed before [11], and could be a favourable phenomenon in terms of heat and mass transfer within the film region since it reduces the thermal resistance of the liquid film. At low capillary numbers as shown in Fig.…”

Section: Flow Pattern and Shear Stressmentioning

confidence: 98%

CFD Modelling Of Film Deposition from a Receding Meniscus in a Capillary Tube Using the Approach of Overset Grid Technique

Nikkhah¹,

Karami²,

Tessier-Poirier³

et al. 2022

International Conference on Fluid Flow, Heat and Mass Transfer

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Meniscus motion in a capillary tube is a very common type of flow in thermal management devices such oscillating and pulsating heat pipes. It is well known, that the thin film deposited on the wall, which is due to liquid shear force, plays a major role in heat and mass transfer of those devices. This study focuses on the hydrodynamics of this flow using a CFD axisymmetric model of a 1mm diameter capillary, with the approach of volume of fluid (VoF). The CFD-VOF approach is tuned to capture the liquid film deposition from a receding meniscus at different constant velocities. Due to high required grid resolution, the moving overset mesh technique is used. In doing so, a fine meshed domain consists of meniscus slides over the background domain with a coarse mesh. By using this technique, the number of cells and computational time reduced considerably in comparison with regular meshing approach. With water as a working fluid, the numerical results for the liquid film thickness, at different velocities, compare well with experimental data from the literature. The simulations also show that at higher capillary number, the axial location where the film thickness becomes constant moves away from the meniscus nose. The shear stress distribution indicates higher values near the meniscus compared to uniform film and liquid plug zones which is due to the interface curvature in this zone. Also, a recirculating flow was observed within the liquid film left behind the receding meniscus which could have favourable effects in terms of heat and mass transfer. The present work on hydrodynamics is the first step toward complete modelling of an oscillating meniscus with mass and heat transfer inside the capillaries.

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Section: Flow Pattern and Shear Stressmentioning

confidence: 98%

CFD Modelling Of Film Deposition from a Receding Meniscus in a Capillary Tube Using the Approach of Overset Grid Technique

Nikkhah¹,

Karami²,

Tessier-Poirier³

et al. 2022

International Conference on Fluid Flow, Heat and Mass Transfer

View full text Add to dashboard Cite

show abstract

“…In addition, there are some recirculating flows within the film zone far from the meniscus nose in the deposited liquid film which leads to a locally negative profile of the shear stress number. Recirculation of flow within the film zone was observed before [11] and could be a favorable phenomenon in terms of heat and mass transfer within the film region since it reduces the thermal resistance of the liquid film.…”

Section: Flow Pattern and Shear Stressmentioning

confidence: 99%

Numerical Modelling Of Liquid Film Deposition from Moving Meniscus in a Capillary Tube

Nikkhah¹,

Karami²,

Tessier-Poirier³

et al. 2022

JFFHMT

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Meniscus motion in a capillary tube is a very common type of flow in thermal management devices such as oscillating and pulsating heat pipes. It is well known, that the thin film deposited on the wall, which is due to liquid shear force, plays a major role in the heat and mass transfer of those devices. This study focuses on the hydrodynamics of this flow using a CFD axisymmetric model of a 1mm diameter capillary, with the approach of the volume of fluid (VoF). The CFD-VOF approach is tuned to capture the liquid film deposition from a receding meniscus at different constant velocities. Due to the high required grid resolution, the moving overset mesh technique is used. In doing so, a fine-meshed domain consists of meniscus slides over the background domain with a coarse mesh. By using this technique, the number of cells and computational time are reduced considerably in comparison with the regular meshing approach. With water as a working fluid, the numerical results for the liquid film thickness, at different velocities, compare well with experimental data from the literature. The simulations also show that at a higher capillary number, the axial location where the film thickness becomes constant moves away from the meniscus nose. The shear stress distribution indicates higher values near the meniscus compared to uniform film and liquid plug zones which is due to the interface curvature in this zone. Also, a recirculating flow was observed within the liquid film left behind the receding meniscus which could have favorable effects in terms of heat and mass transfer. The present work on hydrodynamics is the first step toward complete modeling of an oscillating meniscus with mass and heat transfer inside the capillaries.

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“…Adaze et al [21] presented a computational fluid dynamic for twophase flow. The authors reported that the CFD technique is flexible way but it is a bit complex to obtain convergence.…”

Section: Related Workmentioning

confidence: 99%

Investigation in Gas-Oil Two-Phase Flow using a Differential Pressure Transducer and Wire Mesh Sensor in Vertical Pipes

Musa

Mahmood

Simo

et al. 2022

EMITTER Int'l J. of Engin. Technol.

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The current study is performed to identify the flow regimes of oil-gas two-phase flow experimentally in a vertical pipe has an internal diameter of 6.7 cm. It also aims to provide more details about the possibility of using Differential Pressure Transducers (DPT) for indicating flow patterns. A flow development of oil and gas has been investigated in a vertical pipe of 6 m in length and operated at atmospheric pressure. A series of experiments have been run to cover a range of inlet oil superficial velocities from 0.262 to 0.419 m/s, and inlet gas superficial velocities from 0.05 to 4.7 m/s. Wire Mesh Sensors (WMS) have been used to collect the obtained void fraction values of the flow. The Differential Pressure Transducer (DPT) is utilized to measure the pressure drop values of a one-meter along the pipe. The flow patterns are classified according to the analysis of void fractions, pressure gradients regarding time series, tomographic images, probability density functions of the void fractions, and pressure gradients. A bubbly flow is observed at low superficial velocities of gas and liquid, slug flow is observed at the lower flow rate of liquid and moderate flow rates of gas, while the churn flow pattern is recognized at the higher rates of liquid and gas. Also, the result has revealed the possibility of using Differential Pressure Transducers (DPT) to classify the gas-oil flow patterns in vertical pipes.

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CFD modeling of two-phase annular flow toward the onset of liquid film reversal in a vertical pipe

Cited by 19 publications

References 17 publications

CFD Modelling Of Film Deposition from a Receding Meniscus in a Capillary Tube Using the Approach of Overset Grid Technique

CFD Modelling Of Film Deposition from a Receding Meniscus in a Capillary Tube Using the Approach of Overset Grid Technique

Numerical Modelling Of Liquid Film Deposition from Moving Meniscus in a Capillary Tube

Investigation in Gas-Oil Two-Phase Flow using a Differential Pressure Transducer and Wire Mesh Sensor in Vertical Pipes

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