Gas–liquid flow around an obstacle in a vertical pipe

Prasser, Horst-Michael; Beyer, Matthias; Frank, Thomas; Issa, S. Al; Carl, Helmar; Pietruske, Heiko; Schütz, P.

doi:10.1016/j.nucengdes.2007.11.007

Cited by 12 publications

(4 citation statements)

References 7 publications

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“…Pretest calculations using ANSYS/CFX and applying a monodispersed bubble size approach were performed for the conditions of test run 074 (J L = 1.017 m/s, J G = 0.0368 m/s) (see [24][25][26]). In the calculation, a fluid domain was modeled 1.5 m upstream and downstream the obstacle.…”

Section: Cfx and Population Balance Methodmentioning

confidence: 99%

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CFD Simulation of Polydispersed Bubbly Two‐Phase Flow Around an Obstacle

Krepper

Ruyer

Beyer

et al. 2008

Science and Technology of Nuclear Installations

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This paper concerns the model of a polydispersed bubble population in the frame of an ensemble averaged two-phase flow formulation. The ability of the moment density approach to represent bubble population size distribution within a multi-dimensional CFD code based on the two-fluid model is studied. Two different methods describing the polydispersion are presented: (i) a moment density method, developed at IRSN, to model the bubble size distribution function and (ii) a population balance method considering several different velocity fields of the gaseous phase. The first method is implemented in the Neptune_CFD code, whereas the second method is implemented in the CFD code ANSYS/CFX. Both methods consider coalescence and breakup phenomena and momentum interphase transfers related to drag and lift forces. Air-water bubbly flows in a vertical pipe with obstacle of the TOPFLOW experiments series performed at FZD are then used as simulations test cases. The numerical results, obtained with Neptune_CFD and with ANSYS/CFX, allow attesting the validity of the approaches. Perspectives concerning the improvement of the models, their validation, as well as the extension of their applicability range are discussed.

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Section: Cfx and Population Balance Methodmentioning

confidence: 99%

“…TOPFLOW experimental volumetric fractions of air bubbles according to different size classes, extracted from[24].…”

mentioning

confidence: 99%

CFD Simulation of Polydispersed Bubbly Two‐Phase Flow Around an Obstacle

Krepper

Ruyer

Beyer

et al. 2008

Science and Technology of Nuclear Installations

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show abstract

“…Das derzeitige Hauptanwendungsgebiet derartiger Sensoren sind experimentelle Grundlagenuntersuchungen zur Analyse von Gas-Wasser-Gemischströmungen in thermohydraulischen Anlagenkomponenten [10].…”

Section: Gittersensorunclassified

Neuartige kapazitive Sensoren für die Visualisierung von MehrphasenströmungenNovel Capacitive Sensors for the Visualization of Multi-Phase Flows

Silva¹,

Thiele

Hampel

2009

Tm - Technisches Messen

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Novel Capacitive Sensors for the Visualization of Multi-Phase FlowsTwo novel imaging sensors for the investigation of multi-phase flows are introduced -the capacitive wire-mesh sensor and the capacitive planar array sensor. Both sensor systems are based on a matrixtype arrangement of sensing elements by which the electrical capacitance of a surrounding fluid is scanned very fast. Thus these sensors are able to yield temporally and spatially high-resolved images of the phase distribution in a multi-phase flow. The sensors and the respective measuring electronics are represented. Furthermore some selected flow visualization results are represented and discussed.

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“…Test series were performed with an airwater flow at ambient conditions as well as with a steam-water mixture at a saturation pressure of 6.5 MPa. Before the experiments were commissioned, an ANSYS CFX 10.0 pre-test calculation was carried out for one of the air-water tests [20].…”

Section: Complex 3d Two-phase Flow Fieldsmentioning

confidence: 99%

Novel experimental measuring techniques required to provide data for CFD validation

Prasser

2008

Nuclear Engineering and Design

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Gas–liquid flow around an obstacle in a vertical pipe

Cited by 12 publications

References 7 publications

CFD Simulation of Polydispersed Bubbly Two‐Phase Flow Around an Obstacle

CFD Simulation of Polydispersed Bubbly Two‐Phase Flow Around an Obstacle

Neuartige kapazitive Sensoren für die Visualisierung von MehrphasenströmungenNovel Capacitive Sensors for the Visualization of Multi-Phase Flows

Novel experimental measuring techniques required to provide data for CFD validation

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