Dynamics of a Taylor bubble in steady and pulsatile co-current flow of Newtonian and shear-thinning liquids in a vertical tube

Abishek, S.; King, Andrew; Narayanaswamy, Ramesh

doi:10.1016/j.ijmultiphaseflow.2015.04.014

Cited by 22 publications

(14 citation statements)

References 37 publications

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“…This behavior shows that the increment in the liquid viscosity elongates the Taylor bubble because the viscous drag increases on the rising bubble. Comparing the Taylor bubble with the Newtonian liquid Taylor bubble, the bubble in the non-Newtonian liquid is still shorter and as the concentration of CMC increases the bubble will be shorter [37]. The velocity profile is expected to be as predicted by Abishek et al [37] in his study of the dynamics of a Taylor bubble in shear-thinning liquid in a vertical tube.…”

Section: Slug Flow Visualization In the Toe-down Well Configurationsmentioning

confidence: 72%

“…Comparing the Taylor bubble with the Newtonian liquid Taylor bubble, the bubble in the non-Newtonian liquid is still shorter and as the concentration of CMC increases the bubble will be shorter [37]. The velocity profile is expected to be as predicted by Abishek et al [37] in his study of the dynamics of a Taylor bubble in shear-thinning liquid in a vertical tube. It can be compared with the Newtonian case because the behavior is similar; the significant difference is in the size of the bubble as stated before.…”

Section: Slug Flow Visualization In the Toe-down Well Configurationsmentioning

confidence: 72%

“…21. This is the result of the shear-thinning behavior of the non-Newtonian liquid [37]. This behavior shows that the increment in the liquid viscosity elongates the Taylor bubble because the viscous drag increases on the rising bubble.…”

Section: Slug Flow Visualization In the Toe-down Well Configurationsmentioning

confidence: 94%

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CFD simulation of two-phase gas/non-Newtonian shear-thinning fluid flow in pipes

Daza-Gómez

Pereyra

Ratkovich

2019

J Braz. Soc. Mech. Sci. Eng.

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The multiphase flow has always been a major concern since it is encountered in many industrial processes that are crucial. Gas/non-Newtonian two-phase flow is found in the upstream of the petroleum industry, where slug flow is the most common flow pattern. This flow pattern has complex hydrodynamics which is crucial to study and evaluate. This study assessed the two-phase gas/non-Newtonian fluid flow in different configurations of pipes. The model was developed using computational fluid dynamics with an orthogonal mesh to evaluate the behavior of the slug dynamics in the different configurations. The model volume of fluid was used to estimate and predict the most important parameters: pressure drop, slug frequency, and length. First, the model was validated with experimental data found in literature in a horizontal 9-m long glass pipe, with an inner diameter of 22.8 mm. The validation was made with carboxymethyl cellulose CMC-water solutions as test fluids. Two concentrations (w/w) of CMC were used: 1% and 6%. The overall average relative error of the model, taking into account the three parameters, was 24.9%. With this result, it was proceeded to evaluate the model and the effect in the slug flow in three different pipe trajectories: toe-down well, one undulation with a hump well and one undulation with a sump well. The comparison was made between results of a gas/Newtonian fluid flow and the gas/non-Newtonian fluid flow. It was found that the slug frequency and length vary in great form. The slug frequency increased in almost all the cases, and the slug length decreased.

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Section: Slug Flow Visualization In the Toe-down Well Configurationsmentioning

confidence: 72%

Section: Slug Flow Visualization In the Toe-down Well Configurationsmentioning

confidence: 72%

See 1 more Smart Citation

CFD simulation of two-phase gas/non-Newtonian shear-thinning fluid flow in pipes

Daza-Gómez

Pereyra

Ratkovich

2019

J Braz. Soc. Mech. Sci. Eng.

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“…The observations conclude that the upward co-current tends to elongate the bubble, while the downward co-current makes the bubble flatter and shorter. A series of experimental and numerical studies were carried out in Kurimoto et al [11], Fershtman et al [12], Lei et al [13], Nogueira et al [14], Magnini et al [15], Tomiyama et al [16], Mirsandi et al [17] and Abishek et al [18] in order to understand the shape and dynamics of bubbles in flowing liquids. As observed in Abishek et al [18], the dynamics of an air bubble rising in a vertical tube under steady and pulsatile co-current flow is studied by using OpenFOAM-2.1.…”

Section: Introductionmentioning

confidence: 99%

“…However, from the above-mentioned literature, it is understood that only four types of experimental and numerical investigations were carried out till date. They are: (1) dynamics of rising bubbles in quiescent liquids as given in Zhang et al [2], Rao et al [4] and Antepara et al [6]; (2) dynamics of drops coalescence as given in Unnikrishnan et al [7], Nobari and Tryggvason [9]; (3) dynamics of rising bubbles in flowing liquids as given in Quan [10], Magnini et al [15] and Abishek et al [18]; and (4) dynamics of liquid drops impacting liquid film as given in Rein [20], Berberovic et al [23] and Liang et al [24]. As per the authors' knowledge, no study has been reported till date on the 3D dynamics of rising bubbles in initially quiescent liquids that are later on disturbed by falling drops.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of rising bubbles in initially quiescent liquids that are later on disturbed by falling drops

Nimmagadda

2020

J Braz. Soc. Mech. Sci. Eng.

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Three-dimensional dynamics of rising bubbles in initially quiescent liquids that are later on disturbed by falling drops has been numerically investigated. The effects of various parameters such as Eotvos number (Eo), Morton number (M), size of the falling drop, single and multiple falling drops on the dynamics of three different cases represented as single bubble rising, inline bubbles rising and offset bubbles rising are investigated. From the results, it is observed that the final bubble rise velocity in disturbed liquid (with Eo = 38.8 and M = 9.71 × 10 −4) due to the impact of falling drop with 0.01 m diameter is increased by 84.21% when compared to the rising bubble in undisturbed quiescent liquid. The same decreases with an increase in the diameter of falling drop up to 0.02 m and 0.03 m, respectively. For inline and offset bubbles, the disturbance caused by the falling drops reduces the final rise velocity by 110% and 113.4%. For Eo = 10.0 and M = 9.71 × 10 −8 , the low fluids internal resistance causes the bubble to rise faster and reach the liquid surface quickly. However, in the case of inline and offset rising bubbles, the bubbles reach the liquid surface even before the falling drop impacts. Keywords Dynamics • Bubbles • Drops • Quiescent • Eotvos • Morton List of symbols D Diameter (m) Eo Eotvos number f Force vector (kg m s −2) g Acceleration due to gravity (m s −2) H Height (m) k Curvature (m −1) L Length (m) M Morton number p Pressure (kg m −1 s −2) Re Reynolds number t Time (s) U Velocity vector (m s −1) W Width (m) Greek symbols α Volume fraction µ Dynamic viscosity (kg m −1 s −1) ρ Density (kg m −3) σ Surface tension (kg s −2) Viscous stress tensor (N m −2) t Turbulent stress tensor (N m −2) Subscripts b Bubble d Drop eq Equivalent g Gas l Liquid r Relative T Terminal z Vertical direction (direction of bubble rise) 1 Lighter fluid (gas) 2 Heavier fluid (liquid) Abbreviations 2D Two-dimensional 3D Three-dimensional VOF Volume of fluid

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Shear stress computation in a millimeter thin flat panel photobioreactor: Numerical design validated by experiments

Jiang

Levasseur

Casalinho

et al. 2020

Biotech and App Biochem

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Flat panels are the most spread type of photobioreactors for studying light effects on a microalgae culture. Their low thickness, usually between 1 and 3 cm, aims at ensuring light homogeneity across the culture. Yet because optical density has to remain very low, studies are still limited to low cell density cultures. To alleviate this problem, even thinner photobioreactors can be designed. Nevertheless, thin flat panel reactors are very prone to induce high shear stress. This work aimed at designing a new millimeter thin panel photobioreactor to study light effects on Chlorella and Scenedesmus genera. We proposed a numerical workflow that is capable of assessing the shear stress intensity in such a reactor. The numerical predictions were validated at three different levels: 2D preliminary simulations were able to reproduce bubble commonly known behaviors; close to the nozzle, the predictions were successfully confronted to shadowgraphy experimental reference; at the mini bioreactor scale, experimental and numerical mixing were found to be close. After these throughout validations, shear stress intensity in the photobioreactor was calculated over 1000 Lagrangian tracers. The experienced shear stress was agglomerated at the population level. From the computed shear stress, it was possible to choose the minimal reactor thickness that would not hinder cell growth.

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Dynamics of a Taylor bubble in steady and pulsatile co-current flow of Newtonian and shear-thinning liquids in a vertical tube

Cited by 22 publications

References 37 publications

CFD simulation of two-phase gas/non-Newtonian shear-thinning fluid flow in pipes

CFD simulation of two-phase gas/non-Newtonian shear-thinning fluid flow in pipes

Dynamics of rising bubbles in initially quiescent liquids that are later on disturbed by falling drops

Shear stress computation in a millimeter thin flat panel photobioreactor: Numerical design validated by experiments

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