Influence of coalescence behaviour of the liquid and of gas sparging on hydrodynamics and bubble characteristics in a bubble column

Camarasa, E.; Vial, Christophe; Poncin, Souhila; Wild, Gabriel; Midoux, N.; Bouillard, Jacques

doi:10.1016/s0255-2701(99)00024-0

Cited by 269 publications

(240 citation statements)

References 28 publications

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“…This indicates that the transition from the homogeneous regime is a gradual process. Similar results have been reported in the literature (Camarasa et al, 1999;Schumpe and Grund, 1986). Whereas the large bubble contribution increases with U G , the small bubble rise velocity after an initial decrease remains constant at approximately 0.1-0.15 m/s.…”

Section: Bubble Samplingsupporting

confidence: 91%

“…Beyond the regime transition, the holdup of the "non-coalescence-induced" bubble increases only slightly, and so the augmentation of the total holdup is mainly due to the increase in the holdup of fast-rising "coalescence-induced" bubbles. It should be noted that if holdup values measured by the bed expansion and the GD technique are in good agreement, the rise velocities of large bubbles obtained by GD are overestimated compared with terminal rising velocities of "coalescence-induced" bubbles because of the presence of internal liquid circulation (Camarasa et al, 1999;Deshpande et al, 1995). Our results agree with the findings of Schumpe and Grund (1986), (2014,2015).…”

Section: Bubble Samplingsupporting

confidence: 89%

See 1 more Smart Citation

Comprehensive experimental investigation of counter-current bubble column hydrodynamics: Holdup, flow regime transition, bubble size distributions and local flow properties

Besagni

Inzoli

2016

Chemical Engineering Science

117

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Section: Bubble Samplingsupporting

confidence: 91%

Section: Bubble Samplingsupporting

confidence: 89%

Comprehensive experimental investigation of counter-current bubble column hydrodynamics: Holdup, flow regime transition, bubble size distributions and local flow properties

Besagni

Inzoli

2016

Chemical Engineering Science

117

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“…gravity, surface tension) on flow by adding or removing them at will. An increasing number of papers deal with CFD application to bubble columns [1,7]. Vial et al [22] cite the most important reasons for this increasing interest.…”

Section: Numerical Simulationsmentioning

confidence: 99%

“…In all these processes, gas holdup and bubble size distribution are important design parameters, since they can be used to define the gas-liquid interfacial area available for mass transfer. In turn, these parameters depend strongly on the operating conditions, the physico-chemical properties of the two phases, the gas sparger type and the column geometry [1,2]. Depending on the gas flow rate, two main flow regimes can be readily observed in bubble columns, namely the homogeneous bubbly flow regime, which is encountered at relatively low gas velocities and the heterogeneous 2 of 16 (churn-turbulent flow) regime, which is observed for higher gas velocities.…”

Section: Introductionmentioning

confidence: 99%

On the Design of Bubble Columns Equipped with a Fine Pore Sparger: Effect of Gas Properties

Ag¹,

Ti²,

Ap³

et al. 2018

Preprint

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Abstract:In our previous works we have proposed design equations that can predict with reasonable accuracy the transition point from homogeneous to heterogeneous regime as well as the gas holdup and the mean Sauter diameter at the homogeneous regime. The validity of the proposed correlations was checked with data obtained using different geometrical configurations and several Newtonian and non-Newtonian liquids as well as the addition of surfactants. However, in all the experiments the gas phase was atmospheric air. This work investigates the effect of gas phase properties by conducting experiments employing various gases (i.e., air, CO 2 , He) that cover a wide range of physical property values. Experiments revealed that only the use of low-density gas (He) has a measurable effect on bubble column performance. More precisely, when the low-density gas (He) is employed, the transition point shifts to higher gas flow rates and the gas holdup decreases, a fact attributed to the lower momentum force exerted by the gas. In view of the new data, the proposed correlations have been slightly modified to include the effect of gas phase properties and it is found that they can predict the aforementioned quantities with an accuracy of ±15%. It has been also proved that CFD simulations are an accurate means for assessing the flow characteristics inside a bubble column.

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“…In the oil and gas industry, they have gained interest only in the 90s because of the "foamy oil phenomenon" that causes higher production rates than expected for unconventional oil reservoirs, as this phenomenon could be explained by the particular viscosity behavior of foamy fluids. In practice, conventional bubbly flows have been extensively studied since the 70s, in the presence or in the absence of tensioactive agents in the liquid phase (see, e.g., Camarasa et al, 1999). Conventional bubbly flows cover the situation where a gas phase is dispersed in forms of bubbles of various shapes (spherical, ellipsoidal but also spherical caps, etc.)…”

Section: Introductionmentioning

confidence: 99%

Development of a Model Foamy Viscous Fluid

Vial

Narchi²

2013

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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IFP Energies nouvelles International Conference Rencontres Scientifiques d'IFP Energies nouvellesRe´sume´-De´veloppement d'un mode`le de dispersion gaz-liquide de type mousse liquide visqueuse -L'objectif est de de´velopper un fluide mode`le repre´sentatif des « mousses liquides », c'est-a`-dire pre´sentant un taux de vide en dec¸a`de l'empilement ale´atoire de sphe`res, dont les proprie´te´s rhe´ologiques et la stabilite´peuvent eˆtre pre´dites. Tout d'abord, la pre´paration de ces fluides mode`les sera de´crite a`la fois en termes de formulation et de proce´de´s. Ensuite, les re´sultats expe´rimentaux seront discute´s. Ceux-ci montrent que des mousses liquides visqueuses mode`les pre´sentant une distribution de tailles de bulles monomodales ont e´te´obtenues avec un taux de vide entre 25 % et 50 % (v/v). Leurs proprie´te´s viscoe´lastiques en e´coulement et aux faibles de´formations re´sultent des interactions entre la formulation de la phase continue, le taux de vide et le diame`tre des bulles. Leur viscosite´apparente peut eˆtre de´crite par un mode`le de Cross et la viscosite´a`cisaillement nul peut eˆtre pre´dite par le mode`le de Mooney jusqu'a`un taux de gaz de 40 %. Les mesures en mode harmonique ont montre´que les re`gles de CoxMerz et de Laun s'appliquent quand le nombre capillaire Ca est infe´rieur a`0,1. L'e´tendue du plateau Newtonien a`faible cisaillement de´croıˆt lorsque le taux de vide augmente ou lorsque la taille des bulles diminue. Dans le domaine rhe´ofluidifiant, la contrainte de cisaillement varie proportionnellement a`Ca 1/2 , comme dans les mousses humides pre´sentant des interfaces immobilise´es. Finalement, les mousses liquides visqueuses obtenues ont pu eˆtre cisaille´es jusqu'a`des valeurs de Ca de 0,1 sans modifier leur microstructure. La stabilite´de ces fluides au repos atteint plusieurs heures et elle augmente avec le taux de vide a`cause des contraintes ste´riques entre les bulles ; ils constituent donc des fluides mode`les inte´ressants pour l'e´tude des mousses liquides visqueuses pre´sentant un taux de vide en dec¸a`de l'empilement ale´atoire de sphe`res.Abstract -Development of a Model Foamy Viscous Fluid -The objective is to develop a model viscous foamy fluid, i.e. below the very wet limit, the rheological and stability properties of which can be tuned. First, the method used for the preparation of foamy fluids is detailed, including process and formulation. Then, experimental results highlight that stable foamy fluids with a monomodal bubble size distribution can be prepared with a void fraction between 25% and 50% (v/v). Their viscoelastic properties under flow and low-strain oscillatory conditions are shown to result from the interplay between the formulation of the continuous phase, void fraction and bubble size. Their apparent viscosity can be described using the Cross equation and zero-shear Newtonian viscosity may be predicted by a Mooney equation up to a void fraction about 40%. The Cox-Merz and the 2013129 Laun's rules apply when the capillary number Ca is low...

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Influence of coalescence behaviour of the liquid and of gas sparging on hydrodynamics and bubble characteristics in a bubble column

Cited by 269 publications

References 28 publications

Comprehensive experimental investigation of counter-current bubble column hydrodynamics: Holdup, flow regime transition, bubble size distributions and local flow properties

Comprehensive experimental investigation of counter-current bubble column hydrodynamics: Holdup, flow regime transition, bubble size distributions and local flow properties

On the Design of Bubble Columns Equipped with a Fine Pore Sparger: Effect of Gas Properties

Development of a Model Foamy Viscous Fluid

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