Computational investigation on bubble detachment from submerged orifice in quiescent liquid under normal and reduced gravity

Chakraborty, Indrajit; Ray, Bahni; Biswas, Gautam; Durst, F.; Sharma, Ashutosh; Ghoshdastidar, P. S.

doi:10.1063/1.3152437

Cited by 72 publications

(35 citation statements)

References 42 publications

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“…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]. More recently, CFD simulations have been performed to study various aspects of adiabatic bubble formation [26][27][28][29][30][31][32][33] on submerged orifices and nozzles and the results show that this is a very promising avenue for research in this branch of physics.…”

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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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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“…Gordillo et al 52 reported numerical results of the characteristics of the minimum neck radius of the bubbles with time at high Reynolds numbers. Gerlach et al, 55 Buwa et al, 56 and Chakraborty et al 57 used the CLSVOF method to evaluate the bubble formation process at a single submerged orifice under low and high gas flow rates. In their work, the effects of the orifice diameter, 56 gravity, 57 and gas flow rates on the period-1 and period-2 bubbling regimes and their transition characteristics 55,56 were reported.…”

Section: Introductionmentioning

confidence: 99%

“…Gerlach et al, 55 Buwa et al, 56 and Chakraborty et al 57 used the CLSVOF method to evaluate the bubble formation process at a single submerged orifice under low and high gas flow rates. In their work, the effects of the orifice diameter, 56 gravity, 57 and gas flow rates on the period-1 and period-2 bubbling regimes and their transition characteristics 55,56 were reported. To the best of the authors' knowledge, there has been no numerical study to investigate the dynamics of bubble formation and rising in a high-density liquid metal as one of the fluids.…”

Section: Introductionmentioning

confidence: 99%

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Bubble formation and dynamics in a quiescent high‐density liquid

et al. 2015

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Gas bubble formation from a submerged orifice under constant-flow conditions in a quiescent high-density liquid metal, lead-bismuth eutectic (LBE), at high Reynolds numbers was investigated numerically. The numerical simulation was carried out using a coupled level-set and volume-of-fluid method governed by axisymmetric Navier-Stokes equations. The ratio of liquid density to gas density for the system of interest was about 15,261. The bubble formation regimes varied from quasi-static to inertia-dominated and the different bubbling regimes such as period-1 and period-2 with pairing and coalescence were described. The volume of the detached bubble was evaluated for various Weber numbers, We, at a given Bond number, Bo, with Reynolds number Re ) 1. It was found that at high values of the Weber number, the computed detached bubble volumes approached a 3/5 power law. The different bubbling regimes were identified quantitatively from the time evolution of the growing bubble volume at the orifice. It was shown that the growing volume of two consecutive bubbles in the period-2 bubbling regime was not the same whereas it was the same for the period-1 bubbling regime. The influence of grid resolution on the transition from period-1 to period-2 with pairing and coalescence bubbling regimes was investigated. It was observed that the transition is extremely sensitive to the grid size. The transition of period-1 and period-2 with pairing and coalescence is shown on a Weber-Bond numbers map. The critical value of Weber number signalling the transition from period-1 to period-2 with pairing and coalescence decreases with Bond number as We $ Bo 21 , which is shown to be consistent with the scaling arguments. Furthermore, comparisons of the dynamics of bubble formation and bubble coalescence in LBE and water systems are discussed. It was found that in a high Reynolds number bubble formation regime, a difference exists in the transition from period-1 to period-2 with pairing and coalescence between the bubbles formed in water and the bubbles formed in LBE. V C 2015 American Institute of Chemical Engineers AIChE J, 61: 3996-4012, 2015

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“…In order to ease the calculations, numerical treatments of the problem often assume the bubble to be a sphere 13,14 or a truncated spherical segment, 15,16 or use other simplifying assumptions depending on the aim of the particular investigation. For example, in Refs.…”

Section: Introductionmentioning

confidence: 99%

Analysis of quasi-static vapour bubble shape during growth and departure

Lesage¹,

Cotton²,

Robinson³

2013

Physics of Fluids

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In an effort to better understand the physical mechanisms responsible for pool boiling heat transfer, a numerical solution to the capillary equation is used to describe bubble shape evolution. Indeed, any analysis of thermal transport due to nucleate pool boiling requires bubble frequency and volume predictions, which are intimately linked to bubble shape. To this end, a numerical treatment of the capillary equation is benchmarked to profiles measured from captured images of vapour bubble formations. The bubble growth is quasi-static in a quiescent liquid with a triple contact line fixed to the perimeter of a needle orifice. This investigation provides insight into the dependence the bubble shape evolution has on the physical mechanisms quantified in the Bond number with characteristic length equal to the cavity radius.

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Computational investigation on bubble detachment from submerged orifice in quiescent liquid under normal and reduced gravity

Cited by 72 publications

References 42 publications

Experimental study of gas injected bubble growth from submerged orifices

Experimental study of gas injected bubble growth from submerged orifices

Bubble formation and dynamics in a quiescent high‐density liquid

Analysis of quasi-static vapour bubble shape during growth and departure

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