Experimental study of bubble formation at metal porous spargers: Effect of liquid properties and sparger characteristics on the initial bubble size distribution

Kazakis, Nikolaos A.; Mouza, A.A.; Paras, S.V.

doi:10.1016/j.cej.2007.04.040

Cited by 136 publications

(82 citation statements)

References 29 publications

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“…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%

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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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Section: Introductionmentioning

confidence: 99%

“…In previous works conducted in this laboratory [2,[6][7][8] we have experimentally studied the effect of the sparger characteristics (i.e. diameter, pore size), the liquid physical properties and the gas flow rate on the performance of a bubble column equipped with a fine pore sparger.…”

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

View full text Add to dashboard Cite

show abstract

“…Table 2. The measured values of Sauter mean diameter have been compared with those predicted by the correlating equation [25] shown as Eq. (4) above.…”

Section: Bubble Sizes and Specific Interfacial Areamentioning

confidence: 99%

“…More recent work has used photography [23]- [25][44]- [47], nonisokinetic withdrawal in conjunction with electro-optic detection [48], two needle local probes [49], four fibre optic probes [50] and a Wire Mesh Sensor [21]. The liquids used were almost exclusively water with different chemical dissolved in them, e.g., Na2CO3, NaHCO3, NaOH [43], DEA [44], TEA [45], polymer plus surfactant [46] and surfactant [47].…”

Section: Figmentioning

confidence: 99%

“…A typical size for these orifices is 0.5 mm diameter [20], [21]. The porous type, which can be made of metal, plastic or glass, is produced by partially melting powders of these materials in a mould so that the particles fuse but leave passages in the sintered material through which fluids can pass [22]- [25]. The sizes of bubbles created at nozzles, such as the holes of a perforated plate at the bottom of a pool of liquid were originally modelled for the viscous [26] and inviscid [27] cases.…”

Section: Relationships Characterising Bubble Behaviourmentioning

confidence: 99%

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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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Foams

Gochev

Ulaganathan

Miller

2016

Ullmann's Encyclopedia of Industrial Chemistry

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The article contains sections titled: 1. Introduction 2. History of Liquid Foam 3. Fundamentals of Liquid Foam 3.1. Foam Generation 3.1.1. Bubble Detaching from a Capillary 3.1.2. Rising Bubble in Liquid 3.1.3. Collision with Surface 3.2. Foam Structure 3.3. Foam Properties and Stability 3.3.1. Foam Drainage 3.3.2. Gas Diffusion in Foam 3.3.3. Bubble Coalescence 3.4. Foam Rheology 3.5. Foams in Microgravity 4. Foam Stabilizers 4.1 4.1. Surfactants 4.2 4.2. Proteins 4.3. Nanoparticles 5. Antifoamers and Defoamers 6. Applications in Industry 6.1. Liquid Foams 6.1.1. Foams in Separation Processes 6.1.2. Foams in Detergency, Pharmacy, and Cosmetics 6.1.3. Foams in Food 6.1.4. Foams in Firefighting 6.2. Solid Foams 6.2.1. Polymeric Foams 6.2.2. Metallic Foams 6.2.3. Ceramic Foam

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Experimental study of bubble formation at metal porous spargers: Effect of liquid properties and sparger characteristics on the initial bubble size distribution

Cited by 136 publications

References 29 publications

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

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

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

Foams

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