Bubble formation in quiescent liquids under constant flow conditions

Gaddis, E. S.; Vogelpohl, Alfons

doi:10.1016/0009-2509(86)85202-2

Cited by 197 publications

(118 citation statements)

References 12 publications

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“…6 of Zhang et al [11] also shows spherical cap bubbles in photos from a position higher up the column. The bubble sizes reported [11] are in agreement with values predicted by Gaddis and Vogelpohl [28] which is the appropriate model for the geometry [11].…”

Section: Bubble Sizes and Specific Interfacial Areasupporting

confidence: 78%

“…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. Subsequently, Gaddis and Vogelpohl [28] considered the relevant forces related to the creation of bubbles. These are buoyancy and gas momentum which aid bubble removal and surface tension, drag and inertia which hinder the detachment.…”

Section: Relationships Characterising Bubble Behaviourmentioning

confidence: 99%

“…Liquid silicone oil (see Table 3 for physical properties). Vertical lines are predictions of bubble diameter at formation at air injection orifices [28].…”

Section: Tablementioning

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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Section: Bubble Sizes and Specific Interfacial Areasupporting

confidence: 78%

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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“…The tube outlet was centered in the cylinder and pointed vertically upward. The injector tube had an inner diameter of 0.8 or 1.6 mm, which, for reference, produce initial bubble sizes of 3.4 and 4.3 mm, respectively, when surface tension dominates detachment [27]. Thus the dimensionless injector (sparger) opening parameter for the 0.8 and 1.6 mm injector tubes are 4.3 and 2.7 [28], respectively.…”

Section: Test Facility and Air Injectionmentioning

confidence: 99%

Characterization of Bubble Size Distributions within a Bubble Column

Mohagheghian

Elbing

2018

Fluids

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Abstract:The current study experimentally examines bubble size distribution (BSD) within a bubble column and the associated characteristic length scales. Air was injected into a column of water via a single injection tube. The column diameter (63-102 mm), injection tube diameter (0.8-1.6 mm) and superficial gas velocity (1.4-55 mm/s) were varied. Large samples (up to 54,000 bubbles) of bubble sizes measured via 2D imaging were used to produce probability density functions (PDFs). The PDFs were used to identify an alternative length scale termed the most frequent bubble size (d mf ) and defined as the peak in the PDF. This length scale as well as the traditional Sauter mean diameter were used to assess the sensitivity of the BSD to gas injection rate, injector tube diameter, injection tube angle and column diameter. The d mf was relatively insensitive to most variation, which indicates these bubbles are produced by the turbulent wakes. In addition, the current work examines higher order statistics (standard deviation, skewness and kurtosis) and notes that there is evidence in support of using these statistics to quantify the influence of specific parameters on the flow-field as well as a potential indicator of regime transitions.

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“…Applying the above assumptions reduces the momentum balance on the bubble to what can be considered an equilibrium force balance which takes the form [44,45];…”

Section: Forces Acting On a Growing Bubblementioning

confidence: 99%

Experimental study of gas injected bubble growth from submerged orifices

Bari

Robinson

2013

Experimental Thermal and Fluid Science

129

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a b s t r a c tThis work investigates the mechanism of adiabatic gas bubble growth from submerged orifices with the view of elucidating the interdependence of the bubble shape and the pressure field during growth and departure. Air injection flow rates between 10 mlph and 100 mlph have been tested for orifices of diameters 0.58 mm, 1.05 mm and 1.6 mm. The force field around single isolated bubbles during growth and detachment has been investigated experimentally with the aid of high speed photography and detailed image processing and measurement of the internal bubble pressure. Different flow rates have been compared in order to elucidate dynamic effects. Combining measurements of the instantaneous gas pressure, measurements of the local curvature and the Young-Laplace equation has allowed the estimation of the liquid pressure field acting on the gas-liquid interface over the entire bubble surface. These have subsequently been decomposed into constitutive components such as buoyancy, contact pressure, capillary and the dynamic pressure forces.

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Bubble formation in quiescent liquids under constant flow conditions

Cited by 197 publications

References 12 publications

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

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

Characterization of Bubble Size Distributions within a Bubble Column

Experimental study of gas injected bubble growth from submerged orifices

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