Bubble flow characteristics in bubble columns at elevated pressure and temperature

Lin, Tsao-Jen; Tsuchiya, Katsumi; Fan, Liang‐Shih

doi:10.1002/aic.690440306

Cited by 144 publications

(116 citation statements)

References 37 publications

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“…The effect of pressure can be related to the liquid phase (i.e., µ L and ρ L ) and gas phase (i.e., ρ G ) parameters. The liquid phase has a limited influence [180]; the parameters of the gas phase have a higher influence [1]. It is worth noting that the gas density also has an influence over ε G at ambient pressure (Section 2.2.4).…”

Section: Pressurementioning

confidence: 99%

“…Most of the authors reported a positive effect of the temperature, T c , over ε G [56,86,117,132,177,180,181,[186][187][188]; on the other hand, Pohorecki et al [187] observed no effect of T c -possibly caused by the evaporation-and some authors observed a decrease of ε G T c increased [78,136,189,190]. It is worth noting that the studies reporting a decrease in ε G used at low U G and, in accordance with Yang et al [190], turbulence is low under these conditions,.…”

Section: Temperaturementioning

confidence: 99%

See 1 more Smart Citation

Two-Phase Bubble Columns: A Comprehensive Review

2018

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We present a comprehensive literature review on the two-phase bubble column; in this review we deeply analyze the flow regimes, the flow regime transitions, the local and global fluid dynamics parameters, and the mass transfer phenomena. First, we discuss the flow regimes, the flow regime transitions, the local and global fluid dynamics parameters, and the mass transfer. We also discuss how the operating parameters (i.e., pressure, temperature, and gas and liquid flow rates), the operating modes (i.e., the co-current, the counter-current and the batch modes), the liquid and gas phase properties, and the design parameters (i.e., gas sparger design, column diameter and aspect ratio) influence the flow regime transitions and the fluid dynamics parameters. Secondly, we present the experimental techniques for studying the global and local fluid dynamic properties. Finally, we present the modeling approaches to study the global and local bubble column fluid dynamics, and we outline the major issues to be solved in future studies.

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Section: Pressurementioning

confidence: 99%

Section: Temperaturementioning

confidence: 99%

Two-Phase Bubble Columns: A Comprehensive Review

2018

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“…The bubble velocity/size as predicted by the equation of Lin [29] show good agreement between the ionic liquid and a proposed modelling liquid. In this paper we will show that a similar agreement is present for the characteristics of Taylor bubbles and liquid slug and also specific interfacial area.…”

Section: Figmentioning

confidence: 78%

“…1. An equation considering all the three factors has been produced by Lin et al [29]. Clift et al [31] published a map identifying the ranges of the dimensionless groups for which different types of bubbles exist.…”

Section: Relationships Characterising Bubble Behaviourmentioning

confidence: 99%

Characterisation of an analogue liquid for hydrodynamic studies of gas-ionic liquid flows

Azzopardi

Agunlejika

Zhao

et al. 2017

Chemical Engineering Journal

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Ionic liquids are liquid salts at low temperatures (normally less than 100°C). They are powerful solvents with very low vapour pressure. They have great potentials in many applications such as gas absorption and chemical synthesis. However, they are expensive. This limits extensive studies towards establishing phenomenological models. To address this limitation, an analogue liquid, with properties similar to an ionic liquid, has been identified which on the grounds of cost and safety appears to be suitable.In this paper, the hydrodynamic behaviour of an ionic liquid in a bubble column is compared with those of water and other liquids with similar physical properties. Average gas holdup, bubble coalescence, bubble size and specific interfacial area with different liquids are examined. Gas hold-up was determined by monitoring the change of conductivity between two flush mounted rings. The differences in bubble size and coalescence are revealed by analysing the stills taken from a high speed video camera. The dominant flow pattern in a small diameter column with ionic liquids or other fluids having similar viscosity is slug flow. The small bubbles in the liquid slugs make a smaller contribution to the specific interfacial area than Taylor bubbles. It is observed that Taylor bubbles can coalesce. The hydrodynamics of an ionic liquid in a bubble column can be estimated from that of a fluid with similar physical properties.

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“…Shah et al (1982) report that values of n in the range of 0.7-1.2 have been utilized to describe ε G data falling into the homogeneous regime, and values of n within the range of 0.4-0.7 have been used to fit ε G data belonging to the churn-turbulent regime. 1.3 Effect of gas properties and pressure Wilkinson et al (1992) and Lin et al (1998) concluded that the gas holdup ε G increases appreciably with an increase in pressure. This conclusion is valid for both low and high viscosity liquids.…”

Section: Effect Of Superficial Gas Velocitymentioning

confidence: 99%

A New Approach for the Prediction of Gas Holdup in Bubble Columns Operated under Various Pressures in the Homogeneous Regime

Nedeltchev

Schumpe

2008

J. Chem. Eng. Japan

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A new semi-theoretical approach for prediction of gas holdups in the homogeneous flow regime is suggested. The model is based on two different expressions for the gas-liquid interfacial area. It is argued that in the case of oblate ellipsoidal bubbles (formed in the homogeneous regime) some correction factor should be introduced in order to render both expressions equivalent. The correction term is correlated to Eötvös number and a dimensionless gas density ratio. The method was capable of predicting 386 experimental gas holdups measured in 21 organic liquids, 17 liquid mixtures and tap water with an average relative error of 9.6%.

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Bubble flow characteristics in bubble columns at elevated pressure and temperature

Cited by 144 publications

References 37 publications

Two-Phase Bubble Columns: A Comprehensive Review

Two-Phase Bubble Columns: A Comprehensive Review

Characterisation of an analogue liquid for hydrodynamic studies of gas-ionic liquid flows

A New Approach for the Prediction of Gas Holdup in Bubble Columns Operated under Various Pressures in the Homogeneous Regime

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