An experimental study of the wake of gas slugs rising in liquids

Campos, J.B.L.M.; Carvalho, J.R.F. Guedes de

doi:10.1017/s0022112088002599

Cited by 134 publications

(99 citation statements)

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“…(4) wake. Around the lower part of the body region (2b), the film has achieved its equilibrium thickness l. In this example, the wake appears dark because it contains a dyed liquid (see Campos & Guedes de Carvalho 1988, for details).…”

Section: Introductionmentioning

confidence: 93%

“…Much of the previous research into the behaviour of Taylor bubbles has been motivated by their importance in industrial and engineering settings, particularly as components of two-phase 'slug flow' (Nicklin et al 1962, Fabré & Liné 1992. This work has included theoretical studies (Dumitrescu 1943;Davies & Taylor 1950;Goldsmith & Mason 1962;Brown 1965;Batchelor 1967), experimental studies (Davies & Taylor 1950;Goldsmith & Mason 1962;White & Beardmore 1962;Campos & Guedes de Carvalho 1988;Viana et al 2003;Nogueira et al 2006) and numerical studies (Taha & Cui 2006;Zheng et al 2007;Feng 2008;Kang et al 2010). A major goal of previous work has been to quantify the physical controls on the ascent velocity v b of Taylor bubbles (recently reviewed by Viana et al 2003) and the nature of the velocity field in the liquid around them (e.g.…”

Section: Introductionmentioning

confidence: 99%

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The thickness of the falling film of liquid around a Taylor bubble

et al. 2011

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We present the results of laboratory experiments that quantify the physical controls on the thickness of the falling film of liquid around a Taylor bubble, when liquid-gas interfacial tension can be neglected. We find that the dimensionless film thickness l (the ratio of the film thickness to the pipe radius) is a function only of the dimensionless parameter N f = r gD 3 /m, where r is the liquid density, g the gravitational acceleration, D the pipe diameter and m the dynamic viscosity of the liquid. For N f 10, the dimensionless film thickness is independent of N f with value l ≈ 0.33; in the interval 10 N f 10 4 , l decreases with increasing N f ; for N f 10 4 film thickness is, again, independent of N f with value l ≈ 0.08. We synthesize existing models for films falling down a plane surface and around a Taylor bubble, and develop a theoretical model for film thickness that encompasses the viscous, inertial and turbulent regimes. Based on our data, we also propose a single empirical correlation for l (N f ), which is valid in the range 10 −1 < N f < 10 5 . Finally, we consider the thickness of the falling film when interfacial tension cannot be neglected, and find that film thickness decreases as interfacial tension becomes more important.

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Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

The thickness of the falling film of liquid around a Taylor bubble

et al. 2011

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“…Bubbles will begin to coalesce on meeting certain separation criteria. The wake length, which is typically around four times shorter than the wake interaction length, defines an area within which any trailing bubble will undergo near-instantaneous coalescence with the leading Taylor bubble, i.e., a rapid acceleration of the trailing bubble into the leading bubble as per [45]:…”

Section: Interactions Between Taylor Bubblesmentioning

confidence: 99%

Combining Spherical-Cap and Taylor Bubble Fluid Dynamics with Plume Measurements to Characterize Basaltic Degassing

Pering

McGonigle

2018

Geosciences

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Basaltic activity is the most common class of volcanism on Earth, characterized by magmas of sufficiently low viscosities such that bubbles can move independently of the melt. Following exsolution, spherical bubbles can then expand and/or coalesce to generate larger bubbles of spherical-cap or Taylor bubble (slug) morphologies. Puffing and strombolian explosive activity are driven by the bursting of these larger bubbles at the surface. Here, we present the first combined model classification of spherical-cap and Taylor bubble driven puffing and strombolian activity modes on volcanoes. Furthermore, we incorporate the possibility that neighboring bubbles might coalesce, leading to elevated strombolian explosivity. The model categorizes the behavior in terms of the temporal separation between the arrival of successive bubbles at the surface and bubble gas volume or length, with the output presented on visually-intuitive two-dimensional plots. The categorized behavior is grouped into the following regimes: puffing from (a) cap bubbles; and (b) non-overpressurized Taylor bubbles; and (c) Taylor bubble driven strombolian explosions. Each of these regimes is further subdivided into scenarios whereby inter-bubble interaction does/does not occur. The model performance is corroborated using field data from Stromboli (Aeolian Islands, Italy), Etna (Sicily, Italy), and Yasur (Vanuatu), representing one of the very first studies, focused on combining high temporal resolution degassing data with fluid dynamics as a means of deepening our understanding of the processes which drive basaltic volcanism.

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“…The limits for the different¯ow patterns in the wake were established 15 supposing that they are determined only by Re V , and taking the experimental study of Campos and Guedes de Carvalho 13 for no net liquid¯ow (U L 0). In all the experiments performed the majority of the bubbles were long enough to have a fully developed liquid ®lm¯owing around the bubble.…”

Section: Methodsmentioning

confidence: 99%