Taylor bubble rising in a vertical pipe against laminar or turbulent downward flow: symmetric to asymmetric shape transition

Fabre, J.; Figueroa-Espinoza, Bernardo

doi:10.1017/jfm.2014.429

Cited by 22 publications

(13 citation statements)

References 14 publications

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“…The results shown in figure 19 are for the same parameter values used to generate figure 18, which correspond to the large Eo, weak surface tension limit; figure 19(d) also depicts the analogous results for the deformed bubble shape when m = 2. These results illustrate the asymmetry of the nose for Taylor bubble motion in downward flowing liquids for negligible surface tension and are reminiscent of the asymmetric shape observed in experiments (see figure 8 in Fabre & Figueroa-Espinoza (2014), figure 10 in Martin (1976) and figure 3 in Fershtman et al (2017)). In figure 20, on the other hand, the results are associated with Eo = 20 at which surface tension effects are significant.…”

Section: Asymmetric Bubble Shapessupporting

confidence: 77%

“…Experiments have indeed confirmed the existence of a critical liquid velocity beyond which the bubble shape loses axisymmetry (Griffith & Wallis 1961;Nicklin et al 1962;Martin 1976;Polonsky et al 1999;Fabre & Figueroa-Espinoza 2014;Fershtman et al 2017). An example of asymmetric bubble shapes in downward flowing liquids is shown in figure 1 in which it is seen that the bubble nose becomes distorted, and in an attempt to avoid the fast-moving fluid at the centre of the tube, the bubble moves closer to the tube wall (Nicklin et al 1962), rising faster than it would have done had it remained axisymmetric (Martin 1976;Polonsky et al 1999).…”

Section: Introductionmentioning

confidence: 87%

“…The focus in the literature has been on the dynamics of Taylor bubbles rising in upwardly flowing liquids characterised by a steady rise speed. In contrast, there is a relative dearth of studies concerning Taylor bubble motion in downward liquid flow, which is known to be accompanied by a transition to asymmetric bubble shapes (Nicklin et al 1962;Martin 1976;Lu & Prosperetti 2006;Figueroa-Espinoza & Fabre 2011;Fabre & Figueroa-Espinoza 2014;Fershtman et al 2017).…”

Section: Flowing Liquids (U M /mentioning

confidence: 99%

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Linear stability analysis of Taylor bubble motion in downward flowing liquids in vertical tubes

Abubakar

Matar

2022

J. Fluid Mech.

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Taylor bubbles are a feature of the slug flow regime in gas–liquid flows in vertical pipes. Their dynamics exhibits a number of transitions such as symmetry breaking in the bubble shape and wake when rising in downward flowing and stagnant liquids, respectively, as well as breakup in sufficiently turbulent environments. Motivated by the need to examine the stability of a Taylor bubble in liquids, a systematic numerical study of a steadily moving Taylor bubble in stagnant and flowing liquids is carried out, characterised by the dimensionless inverse viscosity $( N_f )$ , Eötvös $( Eo )$ and Froude numbers $( U_m )$ , the latter being based on the centreline liquid velocity, using a Galerkin finite-element method. A boundary-fitted domain is used to examine the dependence of the steady bubble shape on a wide range of $N_f$ , $Eo$ and $U_m$ . Our analysis of the bubble nose and bottom curvatures shows that the intervals $Eo = [ 20,30 )$ and $N_f=[60,80 )$ are the limits below which surface tension and viscosity, respectively, have a strong influence on the bubble shape. In the interval $Eo = (60,100 ]$ , all bubble features studied are weakly dependent on surface tension. A linear stability analysis of the axisymmetric base states shows that there exist regions of $(N_f,Eo,U_m)$ space within which the bubble is unstable and assumes an asymmetric shape. To elucidate the mechanisms underlying the instability, an energy budget analysis is carried out which reveals that perturbation growth is driven by the bubble pressure for $Eo \geq 100$ , and by the tangential interfacial stress for $Eo < 100$ . Examples of the asymmetric bubble shapes and their associated flow fields are also provided near the onset of instability for a wide range of $N_f$ , $Eo$ and $U_m$ .

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Section: Asymmetric Bubble Shapessupporting

confidence: 77%

Section: Introductionmentioning

confidence: 87%

Section: Flowing Liquids (U M /mentioning

confidence: 99%

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Linear stability analysis of Taylor bubble motion in downward flowing liquids in vertical tubes

Abubakar

Matar

2022

J. Fluid Mech.

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“…A similar result has also been reported by Milan et al and Usui and Sato for pipe diameters of 0.0088 m and 0.024 m, respectively. Fabre et al have also reported a similar observation for counter current flow in 0.024–0.04 m diameter pipe. They showed that the motion of an asymmetric bubble is much more sensitive to surface tension than that of a symmetric bubble.…”

Section: Experimentationsupporting

confidence: 58%

Flow pattern transition in gas‐liquid downflow through narrow vertical tubes

et al. 2016

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The present report studies on the flow pattern transitions during vertical air water downflow through millichannels (0.83 ≤ Eötvös no. ≤ 20.63). Four basic flow patterns namely falling film flow, slug flow, bubbly flow, and annular flow are observed in the range of experimental conditions studied and their range of existence has been noted to vary with tube diameter and phase velocities. Based on experimental observations, phenomenological models are proposed to predict the transition boundaries between adjacent patterns. These have been validated with experimental flow pattern maps from the present experiments. Thus the study formalizes procedure for developing a generalized flow pattern map for gas‐liquid downflow in narrow tubes. © 2016 American Institute of Chemical Engineers AIChE J, 63: 792–800, 2017

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“…The slug unit includes a bullet-shaped Taylor bubble and a continuous liquid slug (Araújo et al, 2012). Taylor bubbles move faster than the liquid in vertical tubes with buoyancy effects (Jean & Bernardo, 2014). In this process, a thin film of liquid is formed around Taylor bubbles (Tahir et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical studies on the corrosion properties of AISI 316L stainless steel in two-phase upward slug flows

Liu

et al. 2020

Engineering Applications of Computational Fluid Mechanics

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The corrosion properties of AISI 316L stainless steel in upward slug flow were initially investigated using the electrochemical measurements and computational fluid dynamics (CFD) simulations. The results demonstrate that the slug flow may destroy the passivation film on the specimen surface due to its intermittency and volatility, accelerating the pitting corrosion process on the electrode surface. It results in a higher corrosion rate in the two-phase slug flow than in the single-phase flow. The variations of superficial velocity lead to changes in the slug flow configuration. The variation has a greater impact on the Taylor bubble than the liquid slug. The changes in slug flow configuration result in differences in shear stress and mass transfer coefficient, leading to corresponding differences in electrochemical properties of AISI 316L stainless steel.

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Taylor bubble rising in a vertical pipe against laminar or turbulent downward flow: symmetric to asymmetric shape transition

Abstract: International audienceThe symmetry of Taylor bubbles moving in a vertical pipe is likely to break when the liquid flows downward at a velocity greater than some critical value. The present experiments performed in the inertial regime for Reynolds numbers in the range 10

Cited by 22 publications

References 14 publications

Linear stability analysis of Taylor bubble motion in downward flowing liquids in vertical tubes

Linear stability analysis of Taylor bubble motion in downward flowing liquids in vertical tubes

Flow pattern transition in gas‐liquid downflow through narrow vertical tubes

Experimental and numerical studies on the corrosion properties of AISI 316L stainless steel in two-phase upward slug flows

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