Liquid re-circulation in turbulent vertical pipe flow behind a cylindrical bluff body and a ventilated cavity attached to a sparger

Sotiriadis, A.A.; Thorpe, Rex B.

doi:10.1016/j.ces.2004.09.063

Cited by 13 publications

(3 citation statements)

References 28 publications

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“…We also assume that the radial distribution of liquid velocity in the wake can be described by two parabolic functions. This assumption is consistent with available liquid velocity measurements in the wake of Taylor bubbles (van Hout et al, 1992(van Hout et al, , 2002Nogueira, 2006), bubble column measurements (Mudde, 2005), as well as VOF-CFD calculations (Thorpe et al, 2001;Sotiriadis and Thorpe, 2005;Taha and Cui, 2006).…”

Section: Wake Region (W )supporting

confidence: 86%

“…This assumption is supported by experiments: in the central part of the near wake region, the liquid velocity is oriented upward, while in the near wall region the liquid velocity is negative (van Hout et al, 2002). The typical length of this wake region is one to five pipe diameters (Pinheiro et al, 2000;van Hout et al, 2002;Sotiriadis and Thorpe, 2005).…”

Section: Wake Region (W )mentioning

confidence: 99%

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Void fraction in vertical gas–liquid slug flow: Influence of liquid slug content

Guet

Décarre

Henriot

et al. 2006

Chemical Engineering Science

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In this study we develop a model for computing the mean void fraction and the liquid slug void fraction in vertical upward gas-liquid intermittent flow. A new model for the rate of gas entrained from the Taylor bubble to the liquid slug is formulated. It uses the work done by the pressure force at the rear of the Taylor bubble. Then an iterative approach is employed for equating the gas entrainment flux and the gas flux obtained via conservation equations. Model predictions are compared with experimental data. The developed iterative method is found to provide reasonable quantitative predictions of the entrainment flux and of the void fraction at low and moderate liquid slug void fraction conditions. With an increased liquid slug void fraction, experimental data indicate that the flow in the liquid slug transits to churnheterogeneous bubbly flow thus gas entrainment flux tends to zero. Considering this effect in the iterative model significantly improved the predictions for large liquid slug void fraction conditions.

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Section: Wake Region (W )supporting

confidence: 86%

Section: Wake Region (W )mentioning

confidence: 99%

Void fraction in vertical gas–liquid slug flow: Influence of liquid slug content

Guet

Décarre

Henriot

et al. 2006

Chemical Engineering Science

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“…The shape of the Taylor bubble which apparently looks similar to a bullet was found that it likely affected the pressure drop in the flow by generating vertices behind itself [5][6][7][8]. The consequence of these vertices was the interaction between two successive Taylor bubbles.…”

Section: Introductionmentioning

confidence: 96%

Shapes of an Air Taylor Bubble in Stagnant Liquids Influenced by Different Surface Tensions

Lertnuwat

2018

International Journal of Applied Mechanics and Engineering

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The aim of this work is to propose an empirical model for predicting shapes of a Taylor bubble, which is a part of slug flows, under different values of the surface tension in stagnant liquids by employing numerical simulations. The k   turbulence model was used in the framework of finite volume method for simulating flow fields in a unit of slug flow and also the pressure distribution on a Taylor bubble surface. Assuming that an air pressure distribution inside the Taylor bubble must be uniform, a grid search method was exploited to find an appropriate shape of a Taylor bubble for six values of surface tension. It was found that the shape of a Taylor bubble would be blunter if the surface tension was increased. This was because the surface tension affected the Froude number, controlling the flow around a Taylor bubble. The simulation results were also compared with the Taylor bubble shape, created by the Dumitrescu-and-Taylor model and former studies in order to ensure that they were consistent. Finally, the empirical model was presented from the simulation results.

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Bubble size and mass transfer characteristics of sparged downwards two-phase flow

Sotiriadis

Thorpe

Smith

2005

Chemical Engineering Science

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Liquid re-circulation in turbulent vertical pipe flow behind a cylindrical bluff body and a ventilated cavity attached to a sparger

Cited by 13 publications

References 28 publications

Void fraction in vertical gas–liquid slug flow: Influence of liquid slug content

Void fraction in vertical gas–liquid slug flow: Influence of liquid slug content

Shapes of an Air Taylor Bubble in Stagnant Liquids Influenced by Different Surface Tensions

Bubble size and mass transfer characteristics of sparged downwards two-phase flow

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