Flow physics of upward cocurrent gas-liquid annular flow in a vertical small diameter tube

Han, Huawei; Gabriel, Kamiel

doi:10.1007/bf02870980

Cited by 7 publications

(2 citation statements)

References 14 publications

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“…However, due to its complexity, i.e., multi-phase, atomisation, deposition, droplets, bubbles, film, and waves, an accurate and detailed simulation of the annular two-phase flow attracts great interest. A common shortcoming of current CFD models is the treatment method used for the dynamic gas-liquid interface configuration [196]. Because of the challenges in determining the interface dynamics, a simple wave shape or even a smooth gas-liquid interface was used in many of the solution models.…”

Section: Numerical Simulationmentioning

confidence: 99%

“…Because of the challenges in determining the interface dynamics, a simple wave shape or even a smooth gas-liquid interface was used in many of the solution models. Han and Gabriel [196][197][198][199] modelled the gas core flow in a typical annular flow with the simplified flow in the liquid film region. Van der Meulen [18] simulated the droplet behaviour and droplet trajectory in gas-liquid flows in vertical pipes using Star-CD.…”

Section: Numerical Simulationmentioning

confidence: 99%

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Two-Phase Annular Flow in Vertical Pipes: A Critical Review of Current Research Techniques and Progress

Xue¹,

Stewart

Kelly

et al. 2022

Water

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Two-phase annular flow in vertical pipes is one of the most common and important flow regimes in fluid mechanics, particularly in the field of building drainage systems where discharges to the vertical pipe are random and the flow is unsteady. With the development of experimental techniques and analytical methods, the understanding of the fundamental mechanism of the annular two-phase flow has been significantly advanced, such as liquid film development, evolution of the disturbance wave, and droplet entrainment mechanism. Despite the hundreds of papers published so far, the mechanism of annular flow remains incompletely understood. Therefore, this paper summarizes the research on two-phase annular flow in vertical pipes mainly in the last two decades. The review is mainly divided into two parts, i.e., the investigation methodologies and the advancement of knowledge. Different experimental techniques and numerical simulations are compared to highlight their advantages and challenges. Advanced underpinning physics of the mechanism is summarized in several groups including the wavy liquid film, droplet behaviour, entrainment and void fraction. Challenges and recommendations are summarized based on the literature cited in this review.

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Section: Numerical Simulationmentioning

confidence: 99%

Section: Numerical Simulationmentioning

confidence: 99%

Two-Phase Annular Flow in Vertical Pipes: A Critical Review of Current Research Techniques and Progress

Xue¹,

Stewart

Kelly

et al. 2022

Water

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CFD modelling of two-phase gas–liquid annular flow in terms of void fraction for vertical down- and up-ward flow

et al. 2019

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Two-phase flows are present in all the value chain of the oil industry, being of significant interest in pipeline transportation. They are essential for the calculation of production rates or separation process design; therefore, multiphase flows have been studied for several years, and numerous models, data banks and computational software have been developed to design more efficient processes. For this reason, the purpose of this study is to develop a CFD numerical model capable of predicting air-oil and air-water annular flow for up-and downward flows in vertical pipes with the objective of present a methodology to develop a reliable numerical model and present CFD tools as an alternative to the empirical models, or other commercial computational codes such as the dynamic multiphase flow simulators, for the study of multiphase flow. To achieve this objective, 36 simulations using CFD were compared against 150 simulations using OLGA and 66 different empirical correlations to predict void fraction and compare the obtained results against experimental data. Different liquid viscosities (0.00089, 0.127, 0.213, 0.408 and 0.586 Pa s) and three different pipelines were used: a 22.72 m long and 0.0508 m ID pipe, a 15.24 m long and 0.0508 m ID pipe, and a 15.24 m long and 0.1016 m ID pipe. The obtained results showed that the CFD model accurately predicts the void fraction for both down-and upward cases, while the obtained results using OLGA and the empirical correlations showed a lower accuracy.

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Computational fluid dynamics modelling of the regular wave flow regime in air-water downwards annular flows

Varallo,

Mereu,

Besagni

et al. 2024

Chemical Engineering Research and Design

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Flow physics of upward cocurrent gas-liquid annular flow in a vertical small diameter tube

Cited by 7 publications

References 14 publications

Two-Phase Annular Flow in Vertical Pipes: A Critical Review of Current Research Techniques and Progress

Two-Phase Annular Flow in Vertical Pipes: A Critical Review of Current Research Techniques and Progress

CFD modelling of two-phase gas–liquid annular flow in terms of void fraction for vertical down- and up-ward flow

Computational fluid dynamics modelling of the regular wave flow regime in air-water downwards annular flows

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