Modeling and simulation of downward vertical two-phase flow with pipe rotation

Raeiszadeh, Farhad; Hajidavalloo, Ebrahim; Behbahani–Nejad, Morteza; Hanafizadeh, Pedram

doi:10.1016/j.cherd.2018.07.002

Cited by 11 publications

(2 citation statements)

References 11 publications

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“…It is important to identify and control the ow pattern for a better design and control of the industrial devices (Raeiszadeh et al, 2018). Under certain conditions, the liquid and gas phases may ow alternately and irregularly as elongated bubble (also called gas pocket or gas slug) and bulk of liquid regions lling the entire pipe as liquid slug (Mohmmed et al, 2021, resulting in the intermittence of ow parameters such as pressure, void fraction, ow rates of both phases, heat and mass coe cients, etc.…”

Section: Introductionmentioning

confidence: 99%

Identifying the intermittent flow sub-regimes using pressure drop time series fluctuations

Arabi

Salhi

Zenati

et al. 2023

Preprint

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From a literature survey, it has been noticed a lack of objective methods to identify and distinct between the intermittent flow sub-regimes. Thus, the aim of this study is to analyze pressure drop fluctuations using statistical methods in order to propose simple tools to characterize the sub-regimes of the intermittent flow. The pressure drop time series were collected from experiments carried out using air-water mixture and 30 mm ID pipe. The utilization of transparent pipes allowed to identify three sub-regimes which are Plug flow, Less Aerated Slug flow (LAS flow), and Highly Aerated Slug flow (HAS flow). It was found that the PDF displayed a unimodal distribution in all cases studied. Meanwhile, the representation of the base width and maximum values of PDF as function of the gas-to-liquid superficial velocities ratio and the mixture Froude number, respectively, showed that the points for each sub-regime are clustered in the same zone. So, these two feature spaces can be used to identify the sub-regimes. A third feature space, based on the statistical parameters standard deviation and kurtosis, was also proposed as a tool to distinguish between the three sub-regimes.

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Section: Introductionmentioning

confidence: 99%

Identifying the intermittent flow sub-regimes using pressure drop time series fluctuations

Arabi

Salhi

Zenati

et al. 2023

Preprint

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“…Oil-water and gas-water two-phase flows are often encountered in petroleum, chemical and petrochemical industries [3][4][5]. Due to the complex interface, a series of interface problems have not been solved so far, they are still the key to gas-liquid flow research, including phase distribution mode, inter-phase mechanism and microscopic turbulence structure.…”

Section: Introductionmentioning

confidence: 99%

Measurement of interphase forces based on dual-modality ERT/DP sensor in horizontal two-phase flow gas-water

et al. 2019

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In order to better understand the mechanisms of two-phase flow and the prevailing flow regimes in horizontal pipelines, the evaluation of interphase forces is paramount. This study develops a method to quantitatively estimate the interphase force in two-phase gas-water flow in horizontal pipeline. The electrical resistance tomography technology is used to measure the void fraction, while the differential pressure perpendicular to the horizontal pipe is measured in different flow patterns via a Differential Pressure sensor. The inner pipe diameter is 50 mm, the water flow range from 3.26 m 3 /h to 7.36 m 3 /h, the gas flow rate range from 1 to 60 l/min, which covered a range of flow patterns, the absolute pressure range from 0.07 MPa to 0.12 MPa. The relationship between the differential pressure drop and interphase force is established, and the effects of these forces on the flow are analyzed. Experimental results indicate that the dual-modality measurement system was successfully provided a quantitative evaluation of interphase forces in two-phase horizontal gas-water flow.

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Understanding two‐phase flow behaviour: CFD Assessment of silicone oil–air and water–air in an intermediate vertical pipe

Mondal,

Lahiri,

Ghanta

2024

Can J Chem Eng

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The study utilized computational fluid dynamics (CFD) simulations employing the volume of fluid (VOF) model to analyze silicone oil–air flows in a vertical pipe with a diameter of 67 mm. Various structured meshes ensured grid independence, and the k‐ε realizable model addressed turbulence. The analysis characterized bubbly to annular flows, involving the evaluation of flow patterns, radial void fractions, void fraction time series, probability density functions (PDFs), power spectral densities (PSDs), and mean void fractions. Results indicated a transition from bubbly to annular flow with increasing gas velocities and notable changes in radial void fraction profiles. Void fraction exhibited significant variations with distinct flow patterns at constant liquid velocity. PDFs identified flow regimes, and PSDs revealed frequency patterns. CFD results were validated against experiments, demonstrating good agreement. The validated CFD model was utilized to investigate radial gas velocities and pressure drops, revealing a shift from uniform velocity distributions to irregular patterns and a decrease in total pressure drop with an increase in gas superficial velocity. The model was also applied to a water‐air system to explore two‐phase flow behaviour. The impact of superficial gas velocity on flow patterns and radial void fractions was studied through numerical analysis and compared with the silicone oil‐air system. Results showed that at extreme gas velocities (0.06 and 5.53 m/s), silicone oil exhibited bubbly and annular flows, while water displayed cap bubbly and churn flows. The significant variation in radial void fraction at these velocities emphasized the impact of fluid properties.

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Modeling and simulation of downward vertical two-phase flow with pipe rotation

Cited by 11 publications

References 11 publications

Identifying the intermittent flow sub-regimes using pressure drop time series fluctuations

Identifying the intermittent flow sub-regimes using pressure drop time series fluctuations

Measurement of interphase forces based on dual-modality ERT/DP sensor in horizontal two-phase flow gas-water

Understanding two‐phase flow behaviour: CFD Assessment of silicone oil–air and water–air in an intermediate vertical pipe

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