Critical review of vertical gas-liquid slug flow: An insight to better understand flow hydrodynamics' effect on heat and mass transfer characteristics

Holagh, Shahriyar G.; Ahmed, Wael H.

doi:10.1016/j.ijheatmasstransfer.2024.125422

International Journal of Heat and Mass Transfer

2024

DOI: 10.1016/j.ijheatmasstransfer.2024.125422

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Critical review of vertical gas-liquid slug flow: An insight to better understand flow hydrodynamics' effect on heat and mass transfer characteristics

Shahriyar G. Holagh,

Wael H. Ahmed

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Cited by 8 publications

References 374 publications

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BubSAM: Bubble segmentation and shape reconstruction based on Segment Anything Model of bubbly flow

Xu,

Feng,

et al. 2024

AIChE Journal

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Accurate detection and analysis of bubble size and shape in bubbly flow are critical to understanding mass and heat transfer processes. Convolutional neural networks have limitations in different bubble images due to their dependence on large amounts of labeled data. A new foundational Segment Anything Model (SAM) recently attracts lots of attention for its zero‐shot segmentation performance. Herein, we developed a novel image processing method named bubSAM, which achieves efficient and accurate bubble segmentation and shape reconstruction based on SAM. The segmentation performance of bubSAM is 30% higher than that of SAM, and its accuracy reaches 90% under different bubbly flow conditions. The accuracy of bubble shape reconstruction (BSR) algorithm in bubSAM is about 30% higher than that of typical ellipse fitting method, thus better restoring the geometric shape of bubbles. BubSAM can provide great support for understanding gas–liquid multiphase flow and design of industrial multiphase reactors.

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BubSAM: Bubble segmentation and shape reconstruction based on Segment Anything Model of bubbly flow

Xu,

Feng,

et al. 2024

AIChE Journal

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Practical aspects of multiphase slug frequency: An overview

Arabi,

Höhn,

Pallares

et al. 2024

Can J Chem Eng

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Slug frequency, the number of liquid slugs passing through a point per unit of time, is an intrinsic parameter that is used to characterize multiphase slug flows in pipes. In this review we discuss practical aspects of slug frequency for industrial purposes from an examination of published literature and available experimental data. The review shows that slug frequency appears to play a key role in the modelling of intermittent flow using 1‐D mechanistic slug models and 3‐D computational fluid dynamics tools. In addition, various global parameters and phenomena used to design, optimize, and control industrial pipelines are directly impacted by slug frequency. This manuscript highlights the importance of slug frequency not only for petroleum engineering but also for chemical, nuclear, and mechanical engineering.

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Experimental and Numerical Study of Taylor Bubble in Counter-Current Turbulent Flow

Tiselj,

Kren,

Mikuž

et al. 2024

Arab J Sci Eng

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The stagnant Taylor bubble in vertical isothermal turbulent counter-current flow was analyzed using 2D shadowgraphy experiments and two distinct high-fidelity numerical simulations. One simulation employed the geometrical VOF interface tracking method within the OpenFOAM code, while the other utilized the explicit front tracking method of the TrioCFD code. Interface recognition algorithms were applied to the photographs and compared with the results of 3D simulations performed with LES and pseudo-DNS accuracy in OpenFOAM and TrioCFD, respectively. The measured Taylor bubbles exhibited an asymmetric bullet-train shape and a specific speed, which were compared with the predictions of both numerical approaches. Reproducing the experiment proved challenging for both otherwise well-established methods frequently used in interface tracking simulations of two-phase flows. Grid resolution and subgrid turbulent models, known for their success in single-phase turbulence, were less accurate near the water–air interface. Additional experimental parameters compared with simulations were related to the dynamics of tiny disturbance waves with amplitudes ranging from 10 to 100 µm along the interface of the Taylor bubbles. The speed and spectra of the surface disturbance waves were reproduced numerically with moderate success despite detailed grid refinement in the relevant region of the computational domain.

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Critical review of vertical gas-liquid slug flow: An insight to better understand flow hydrodynamics' effect on heat and mass transfer characteristics

Cited by 8 publications

References 374 publications

BubSAM: Bubble segmentation and shape reconstruction based on Segment Anything Model of bubbly flow

BubSAM: Bubble segmentation and shape reconstruction based on Segment Anything Model of bubbly flow

Practical aspects of multiphase slug frequency: An overview

Experimental and Numerical Study of Taylor Bubble in Counter-Current Turbulent Flow

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