The formation of a bubble from a submerged orifice

Simmons, Jonathan A.; Sprittles, James E.; Shikhmurzaev, Yulii D.

doi:10.1016/j.euromechflu.2015.01.003

Cited by 48 publications

(16 citation statements)

References 80 publications

(101 reference statements)

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“…It was found that the bubble detachment time decreases with smaller contact angle. Recently, the finite element method has been used successfully to simulate BF process, formation time, and bubble volume . The CFD results agreed very well with experiments, and two regimes of BF such as static (low gas flow rate) regime and dynamic (high gas flow rate) regime have been identified.…”

Section: Introductionsupporting

confidence: 57%

“…Literature survey shows that many research groups have investigated the BF dynamics by using two‐dimensional (2D) and three‐dimensional (3D) computational domain and validation were done by comparing with published numerical and/or experimental results . Due to the limits of computational capacity, a 2D computational domain is used as the present study is primariliy focused on the BF under low gas flow rate condition.…”

Section: Cfd Modelmentioning

confidence: 99%

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A numerical study of single air bubble formation comparison between in viscous liquid and in water

Islam

Ganesan

Billah

et al. 2019

Asia-Pacific J Chem Eng

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The performance of bubble column reactors is dependent on bubble size that is formed through a sparger. Here, a single air bubble formation (BF) using an orifice in the viscous liquid is modeled by using the volume of fluid method. The interface between the air and the liquid phase is calculated by using the continuum surface force equation. Detailed characteristics of BF such as the instantaneous contact angle, bubble departure volume, bond number due to orifice size and surface tension, and capillary number are examined for different orifice sizes at constant air flow rate boundary condition. The numerical results are validated with available correlation and experimental data for orifice bond number reported in the literature. A comparison of BF characteristics between in the viscous liquid and in the water is examined. The instantaneous contact angle decreases steeply for the orifice with small size than a large orifice. The bubble volume increases with increasing contact angle and decreasing the orifice bond number. In comparison with water, a decreasing detachment time and dome width of bubble and an increasing bubble neck elongation are found in viscous liquid and decrease with increasing bond number. Moreover, there is a minimum capillary number, where the bubble neck elongation height and breakup processes are relatively fast. This study can helpful in designing a coarse gas sparger to develop pseudo‐homogeneous bubbly flow regime at lower superficial gas velocity conditions.

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Section: Introductionsupporting

confidence: 57%

Section: Cfd Modelmentioning

confidence: 99%

A numerical study of single air bubble formation comparison between in viscous liquid and in water

Islam

Ganesan

Billah

et al. 2019

Asia-Pacific J Chem Eng

View full text Add to dashboard Cite

show abstract

“…The approach used is based on the finite element framework originally developed in Sprittles & Shikhmurzaev (2012b to capture dynamic wetting problems and subsequently used to study the coalescence of liquid drops (Sprittles & Shikhmurzaev 2012a, 2014a, including two-phase calculations (Sprittles & Shikhmurzaev 2014b); drop impact phenomena (Sprittles & Shikhmurzaev 2012a); the detachment of bubbles from an orifice (Simmons, Sprittles & Shikhmurzaev 2015); and dynamic wetting in a Knudsen gas (Sprittles 2015). These flow configurations are all inherently multiscale, either due to the disparity of length scales in the problem formulation or because of the dynamics of the process itself, which generates small scales during its evolution, as is the case for breakup phenomena.…”

Section: Computational Approachmentioning

confidence: 99%

Capillary breakup of a liquid bridge: identifying regimes and transitions

Sprittles

2016

J. Fluid Mech.

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Computations of the breakup of a liquid bridge are used to establish the limits of applicability of similarity solutions derived for different breakup regimes. These regimes are based on particular viscous-inertial balances, that is, different limits of the Ohnesorge number Oh. To accurately establish the transitions between regimes, the minimum bridge radius is resolved through four orders of magnitude using a purpose-built multiscale finite element method. This allows us to construct a quantitative phase diagram for the breakup phenomenon which includes the appearance of a recently discovered low-Oh viscous regime. The method used to quantify the accuracy of the similarity solutions allows us to identify a number of previously unobserved features of the breakup, most notably an oscillatory convergence towards the viscous-inertial similarity solution. Finally, we discuss how the new findings open up a number of challenges for both theoretical and experimental analysis.

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“…The experimental data follow the same scaling R d ∝ R p 1/3 as the theoretical prediction for the Fritz radius R F ∝ R p 1/3 but is about 20% lower in value. That the Fritz radius can only be seen as an upper bound is not uncommon; see refs (32) and (41). Here we also speculate that the discrepancy is caused by the buoyancy-induced necking distortion of the bubble root immediately before the detachment.…”

Section: Resultsmentioning

confidence: 99%

Growth and Detachment of Oxygen Bubbles Induced by Gold-Catalyzed Decomposition of Hydrogen Peroxide

Eijkel

Berg

et al. 2017

J. Phys. Chem. C

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Whereas bubble growth out of gas-oversatured solutions has been quite well understood, including the formation and stability of surface nanobubbles, this is not the case for bubbles forming on catalytic surfaces due to catalytic reactions, though it has important implications for gas evolution reactions and self-propulsion of micro/nanomotors fueled by bubble release. In this work we have filled this gap by experimentally and theoretically examining the growth and detachment dynamics of oxygen bubbles from hydrogen peroxide decomposition catalyzed by gold. We measured the bubble radius R(t) as a function of time by confocal microscopy and find R(t) ∝ t1/2. This diffusive growth behavior demonstrates that the bubbles grow from an oxygen-oversaturated environment. For several consecutive bubbles detaching from the same position in a short period of time, a well-repeated growing behavior is obtained from which we conclude the absence of noticeable depletion effect of oxygen from previous bubbles or increasing oversaturation from the gas production. In contrast, for two bubbles far apart either in space or in time, substantial discrepancies in their growth rates are observed, which we attribute to the variation in the local gas oversaturation. The current results show that the dynamical evolution of bubbles is influenced by comprehensive effects combining chemical catalysis and physical mass transfer. Finally, we find that the size of the bubbles at the moment of detachment is determined by the balance between buoyancy and surface tension and by the detailed geometry at the bubble’s contact line.

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The formation of a bubble from a submerged orifice

Cited by 48 publications

References 80 publications

A numerical study of single air bubble formation comparison between in viscous liquid and in water

A numerical study of single air bubble formation comparison between in viscous liquid and in water

Capillary breakup of a liquid bridge: identifying regimes and transitions

Growth and Detachment of Oxygen Bubbles Induced by Gold-Catalyzed Decomposition of Hydrogen Peroxide

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