Aperiodic bubble formation from a submerged orifice

Zhang, Lei; Shoji, Masahiro

doi:10.1016/s0009-2509(01)00241-x

Cited by 148 publications

(102 citation statements)

References 19 publications

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“…It has also been found that the non-linear character of the pressure growth during the liquid penetration inside the nozzle amplifies the disturbance of initial condition of liquid penetration inside the nozzle. The nonlinear behaviours of the bubbling process have been reported, among others in [6,8,9,[11][12][13][14][15][16][17][18]. Furthermore, the non-linear behaviours of bubbles flow in the liquid have also been discussed in [11,[19][20][21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

The loss of synchronization between air pressure fluctuations and liquid flow inside the nozzle during the chaotic bubble departures

2016

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The paper investigates the dynamics of bubble departures from a glass nozzle submerged in a tank filled with distilled water. Air pressure and liquid flow inside the nozzle are simultaneously recorded using a data acquisition system and a high speed camera. The recurrence plot and cross recurrence plot methods are used to identify the loss of synchronization between air pressure fluctuations and the depth of liquid flow inside the nozzle during chaotic bubble departures. We claim that the synchronization between pressure fluctuations and the depth of liquid penetration inside the nozzle is suppressed during chaotic bubble departures. The experimental results show agreement with the numerical findings. The results demonstrate that the non-linearities of processes occurring during liquid penetration inside the nozzle have a significant impact on the synchronization between the time histories of pressure and the corresponding depths of liquid penetration inside the nozzle.

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Section: Introductionmentioning

confidence: 99%

The loss of synchronization between air pressure fluctuations and liquid flow inside the nozzle during the chaotic bubble departures

2016

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“…In this way the bubble dynamics can be scrutinised and the influence of well controlled parameters understood unambiguously. This being the case, there has been a great deal of experimental work done with regard to adiabatic gas injected bubble growth dynamics [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. Some work has been performed on mathematically predicting adiabatic bubble formation and include the use of the boundary integral method [17][18][19][20][21], the Lattice-Boltzmann method [22] and numerical integration of the capillary equation [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Experimental study of gas injected bubble growth from submerged orifices

Bari

Robinson

2013

Experimental Thermal and Fluid Science

128

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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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“…Two of them [48,50] used water, the third [57] employed cyclohexane, a liquid with a surface tension much smaller than water and the fourth [51] used a silicone oil which has a low surface tension and a viscosity of 5 times that of water. These four are all from columns of diameter >100 mm and had distributors which were perforated plates with holes of small diameter, 0.5 mm [49,50,52,57]. The fifth employed water and had a gas distributor with larger holes in a smaller diameter column, 67 mm, and give results in the slug flow regime [58].…”

Section: Other (Lower Viscosity)mentioning

confidence: 99%

“…19, the sources also measured bubble sizes and so specific interfacial area was obtained via Eq. (1) [49,50,51,57]. For the remaining data set which presented slug flow information, the paper [58] provides all the necessary information,…”

Section: Other (Lower Viscosity)mentioning

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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Aperiodic bubble formation from a submerged orifice

Cited by 148 publications

References 19 publications

The loss of synchronization between air pressure fluctuations and liquid flow inside the nozzle during the chaotic bubble departures

The loss of synchronization between air pressure fluctuations and liquid flow inside the nozzle during the chaotic bubble departures

Experimental study of gas injected bubble growth from submerged orifices

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

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