Modeling of bubble coalescence and break-up considering turbulent suppression phenomena in bubbly two-phase flow

Nguyen, Van Thai; Song, Chul-Hwa; Bae, Byoung-Uhn; Euh, Dong-Jin

doi:10.1016/j.ijmultiphaseflow.2013.03.001

Cited by 62 publications

(21 citation statements)

References 33 publications

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“…The fourth term is the lift force normal to the relative velocity due to rotation of fluid. The fifth term is the wall lift force due to the velocity distribution change around particles near a (Ruyer, 2008;Ruyer et al, 2007;Seiler and Ruyer, 2008) ✓ ✓ Nguyen et al (2013a) Round pipe ✓ ✓ ✓ Table 2 Wall nucleation source models utilized in two-phase flow CFD.…”

Section: Interfacial Drag Force Modelsmentioning

confidence: 99%

“…It is worth mentioning that some microgravity gaseliquid two-phase flow data taken in a drop tower are available (Takamasa et al, 2003;Hazuku et al, 2012). Nguyen et al (2013a) modified bubble coalescence and breakup models developed by Yao and Morel (2004) considering turbulent suppression phenomena. The modification was focused on the coalescence and breakup efficiencies.…”

Section: Investigatorsmentioning

confidence: 99%

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Vertical upward two-phase flow CFD using interfacial area transport equation

Chuang

Hibiki

2015

Progress in Nuclear Energy

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Section: Interfacial Drag Force Modelsmentioning

confidence: 99%

Section: Investigatorsmentioning

confidence: 99%

Vertical upward two-phase flow CFD using interfacial area transport equation

Chuang

Hibiki

2015

Progress in Nuclear Energy

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“…Here, r 1 [1/(m 3 s)] is a function describing the break-up of the bubbles of the k-th fraction and r 2 [m 3 /s] is a function describing the coalescence of the bubbles of the k-th fraction. These functions take the following forms [21]:…”

Section: Bubble Dynamicsmentioning

confidence: 99%

“…, We cr is the critical Weber number, σ is the surface tension coefficient, and c 1 , c 2 , and c 3 are the constants given in [21]. Equation (1.5) is written with account of the convective transport (the first term), the bubble expansion due to density variation (the second term) (for example, due to the interphase heat transfer and (or) variation of the pressure gradient), and the joint break-up and coalescence phenomena (the third term).…”

Section: Bubble Dynamicsmentioning

confidence: 99%

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Modeling of turbulent structure of an upward polydisperse gas-liquid flow

Пахомов¹,

Терехов²

2015

Fluid Dyn

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Calculations of the structure of an upward polydisperse gas-liquid pipe flow are presented. The model is based on the Eulerian approach with account of the feedback effect of the bubbles on the average parameters and turbulence of the carrier phase. The turbulent kinetic energy of the fluid is calculated using the transport equations for the Reynolds stresses. The bubble dynamics are described with account for the variation of the mean bubble volume due to the coalescence and break-up of the bubbles. The comparison of the results with experimental data shows that the approach developed makes it possible to describe adequately turbulent gas-liquid flows over a wide range of variation of the gas volume fraction and the initial bubble size.Vertical bubbly flows are typical of chemical, nuclear, power and other branches of engineering. The information on the structure, the average and fluctuation parameters, and the cross-sectional distributions of bubbles in a channel (pipe) flow is necessary both from the fundamental and practical points of view.The complexity of the mathematical description of such flows is associated with the necessity to take into account a large number of factors of different physical nature, such as the carrier-phase turbulence, phase interaction, coalescence and fragmentation of the bubbles. A gas-liquid two-phase flow depends on the flow-rate parameters, geometry, flow regime, physical properties of the liquid and bubbles, and the bubble size [1-6]. As a rule, gas-liquid flows are polydisperse, since the bubbles usually are of different size [7-10]. When modeling these flows with account for the coalescence and break-up of the bubbles, the computational expenses are much higher than in calculating monodisperse bubbly flows. This is why different simplifying assumptions are widely used, the main of which is the monodispersity of the gas-liquid flow [1][2][3][4].To date, several methods of modeling of polydisperse two-phase flows with bubble coalescence and break-up have been developed. At the moment, one of the most informative methods of description of bubble dynamics is the Population Balance Model (PBM) [11]. This model, accomplished with the continuity and momentum equations, is widely used in the Eulerian methods [12][13][14].One of the PBM approaches is the calculation based on the decomposition of all bubbles into several classes with different size and (or) velocity [15] and modeling of each group on the basis of the multi-fluid approach. This is the MUSIG method, in which the inclusions with different sizes have the same velocity [8-10], or its modification H-MUSIG [15], in which the inclusions with different sizes have different velocities. The mass, momentum, and energy balance equations are solved for each "monodisperse" group with account of bubble coalescence and break-up, which results in the nonlinear increase in the computation time with increase in the number of the groups. In [16,17], a model is proposed and the evolution of the bubble size spectrum is modeled numerically. ...

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Single bubble breakup in the flow field induced by a horizontal jet—The experimental research

Feng

Cao

Jiang

et al. 2018

Asia-Pacific J Chem Eng

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Bubble breakup in multiphase reactors has a direct and important impact on the mass transfer and reaction process. This paper experimentally investigated the single bubble behaviors of deformation and breakup under the affecting of a jet submerged in a water‐filled tank. The dispersed phase motion was captured by a high speed camera, while the continuous phase flow field was analyzed by Particle Image Velocimetry. By changing the downstream location of bubble generation, the liquid flow rate and the initial bubble size, the breakup processes were analyzed and discussed. The breakup point, break pattern, and distribution of daughter bubbles were summarized. The position where the bubble gets the maximum acceleration was defined as the shear position, and the forces on the bubble at the shear position had a significant impact on whether breakup will occur. The expected bubble number, which could reflect a combination of the breakup probability and daughter bubbles distribution, was defined and found to be directly proportional to the capillary number of bubbles at the shear position. The research result will contribute to promoting the understanding and control of multiphase flow, and providing a theoretical basis and technical support for the design and optimization of multiphase reactors.

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Modeling of bubble coalescence and break-up considering turbulent suppression phenomena in bubbly two-phase flow

Cited by 62 publications

References 33 publications

Vertical upward two-phase flow CFD using interfacial area transport equation

Vertical upward two-phase flow CFD using interfacial area transport equation

Modeling of turbulent structure of an upward polydisperse gas-liquid flow

Single bubble breakup in the flow field induced by a horizontal jet—The experimental research

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