Assessment of turbulent dispersion models for bubbly flows in the low Stokes number limit

Moraga, Francisco; Larreteguy, Axel E.; Drew, Donald A.; Lahey, R.T.

doi:10.1016/s0301-9322(03)00018-1

Cited by 64 publications

(34 citation statements)

References 15 publications

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“…To model this effect, a turbulence dispersion term is included in the model. Contrary to microscopic diffusion terms included in the mass conservation equation, this effect is taken into account by an additional turbulent dispersion force in the momentum conservation equation (Drew, 2001;Moraga et al, 2003). Following a diffusion approach, this force is modeled as (Carrica et al, 1999;Hill et al, 1995;Politano et al, 2003;Troshko and Hassan, 2002)…”

Section: Closure Formulationmentioning

confidence: 99%

Simplified two‐fluid model for gas‐lift efficiency predictions

2005

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Section: Closure Formulationmentioning

confidence: 99%

Simplified two‐fluid model for gas‐lift efficiency predictions

2005

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“…The share of fibres,  F , in the virtual particle can be calculated by This was because typical values of C TD were found to be the order of 1 for gas bubbles and 500 for smaller diameter particles when the ratio of the particle relaxation time, β d , to β c is small (see Moraga et al, 2003, Hwang, 2006.…”

Section: Modelling the Fibre Transport Applying The Euler/euler Approachmentioning

confidence: 99%

Numerical and experimental investigations for insulation particle transport phenomena in water flow

Krepper

Cartland-Glover

Grahn

et al. 2008

Annals of Nuclear Energy

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The investigation of insulation debris generation, transport and sedimentation becomes more important with regard to reactor safety research for Pressurized and Boiling Water Reactors, when considering the long-term behaviour of emergency core coolant systems during all types of loss of coolant accidents (LOCA). The insulation debris released near the break during a LOCA incident consists of a mixture of a disparate particle population that varies with size, shape, consistency and other properties. Some fractions of the released insulation debris can be transported into the reactor sump, where it may perturb or impinge on the emergency core cooling systems.Open questions of generic interest are for example the particle load on strainers and corresponding pressure drop, the sedimentation of the insulation debris in a water pool, its possible re-suspension and transport in the sump water flow. A joint research project on such questions is being performed in cooperation with the University of Applied Science Zittau/Görlitz and the Forschungszentrum Dresden-Rossendorf. The project deals with the experimental investigation and the development of Computational Fluid Dynamic (CFD) models for the description of particle transport phenomena in coolant flow. While the experiments are performed at the University Zittau/Görlitz, the theoretical work is concentrated at Forschungszentrum Dresden-Rossendorf.In the present paper, the basic concepts for CFD modelling are described and experimental results are presented. Further experiments are designed and feasibility studies were performed.

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“…To model this effect, a turbulence dispersion term is included in the model. Contrary to microscopic diffusion terms included in the mass conservation equation, this effect is taken into account by an additional turbulent dispersion force in the momentum conservation equation (Drew 2001, Moraga et al 2003. Following a diffusion approach, this force (Carrica et al 1999, Hill et al 1995, Politano et al 2003, Troshko & Hassan 2001) is modeled as:…”

Section: Interfacial Forces the Drag-force Density Is Given Bymentioning

confidence: 99%

Fluid Mechanical Aspects of the Gas-Lift Technique

Guet

Ooms

2006

Annu. Rev. Fluid Mech.

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The gas-lift technique comprises the injection of gas bubbles in vertical oil wells to increase production. It is based on a reduction of the tubing gravitational pressure gradient. Several fluid-flow phenomena influencing such vertical gas-liquid flows are discussed. These effects include the radial distribution of void fraction and of gas and liquid velocity, flow regime changes, and system stability problems. Associated consequences for gas-lift performance and related optimization approaches are also discussed.

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Assessment of turbulent dispersion models for bubbly flows in the low Stokes number limit

Cited by 64 publications

References 15 publications

Simplified two‐fluid model for gas‐lift efficiency predictions

Simplified two‐fluid model for gas‐lift efficiency predictions

Numerical and experimental investigations for insulation particle transport phenomena in water flow

Fluid Mechanical Aspects of the Gas-Lift Technique

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