Experimental investigation and CFD simulation of horizontal stratified two-phase flow phenomena

Vallée, C.; Höhne, Thomas; Prasser, Horst-Michael; Sühnel, T.

doi:10.1016/j.nucengdes.2007.02.051

Cited by 86 publications

(32 citation statements)

References 12 publications

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“…To avoid convergence problems at the interface between fluids (air-water), the height of the mesh elements was reduced progressively from 3 mm in the main fluid body to 1 mm close to the pipe wall and to the interface [16,17]. As the position of the interface varied in each case because of the water level, a new grid system was necessary for each simulation.…”

Section: Cfd Modelmentioning

confidence: 99%

Experimental and Numerical Analysis of Egg-Shaped Sewer Pipes Flow Performance

Regueiro-Picallo

Naves

Anta

et al. 2016

Water

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A Computational Fluid Dynamics (CFD) model was developed toanalyze the open-channel flow in a new set of egg-shaped pipes for small combined sewer systems. The egg-shaped cross-section was selected after studying several geometries under different flow conditions. Once the egg-shaped cross-section was defined, a real-scale physical model was built and a series of partial-full flow experiments were performed in order to validate the numerical simulations. Furthermore, the numerical velocity distributions were compared with an experimental formulation for analytic geometries, with comparison results indicating a satisfactory concordance. After the hydraulic performance of the egg-shaped pipe was analyzed, the numerical model was used to compare the average velocity and shear stress against an equivalent area circular pipe under low flow conditions. The proposed egg shape showed a better flow performance up to a filling ratio of h/H = 0.25.

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Section: Cfd Modelmentioning

confidence: 99%

Experimental and Numerical Analysis of Egg-Shaped Sewer Pipes Flow Performance

Regueiro-Picallo

Naves

Anta

et al. 2016

Water

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“…For these reasons, and the relatively high efficiency for numerical solutions, the two-equation SST k−w model is adopted frequently for the numerical simulation as recommended by Yang et al [13]. Moreover, Vallée et al [14] performed a slug flow numerical study for a horizontal two-phase flow pipe with a rectangular cross section using the SST k−w turbulence model for both phases. This homogeneous model has been used in this study because it allows the phase property to propagate and induce damping at the free surface area occupied by the other phase near the interface.…”

Section: Turbulence Modelmentioning

confidence: 99%

Numerical characterisation of slug flow in horizontal air/water pipe flow

Al-Hashimy¹,

Al-Kayiem²,

Time³

et al. 2016

Int. J. CMEM

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In this work, the slug flow regime in an air-water horizontal pipe flow has been simulated using the CFD technique. The variables identified to characterise the slug regime are the slug length and slug initiation. Additionally, the pressure drop and the pressure distribution within the simulated pipe segment have been predicted. The volume of fluid method was employed assuming unsteady, immiscible airwater flow, constant fluid properties and coaxial flow. The model was developed in the STAR-CCM+ environment, and the grid was designed in the three dimensional domain using directed mesh. A grid independency study was carried out through the monitoring of the water velocity at the outlet section. 104,000 hexahedral cells for the entire geometry were decided on as the best combination of computing time and accuracy. The simulated pipe segment was 8 m long and had a 0.074 m internal diameter. Three cases of air-water volume fractions have been investigated, where the water flow rate was pre-set at 0.0028 m 3 /s, and the air flow rate was varied at three dissimilar values of 0.0105, 0.0120 and 0.015 m 3 /s. These flow rates were converted to superficial velocities and used as boundary conditions at the inlet of the pipe. The simulation was validated by bench marking with a Baker chart, and it had successfully predicted the slug parameters. The computational fluid dynamics simulation results revealed that the slug length and pressure were increasing as the air superficial velocity increased. The slug initiation position was observed to end up being shifted to a closer position to the inlet. It was believed that the strength of the slug was high at the initiation stage and reduced as the slug progressed to the end of the pipe. The pressure gradient of the flow was realised to increase as the gas flow rate was increasing, which in turn was a result of the higher mean velocity.

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“…Although two-phase slug flows were extensively studied experimentally, their complexity and the computational costs made that only few studies were conducted to simulate 3D slug flows in horizontal tubes, and even fewer have compared it to experimental data [7][8][9]. It can be shown using an instability analysis based on the Kelvin-Helmholtz theory [1], that waves are formed when the velocity difference between liquid and vapor exceeds a calculated value.…”

Section: Stability Analysismentioning

confidence: 99%

Numerical simulation of evaporating two-phase flow: application to concentrated solar plants with direct steam generation

Dinsenmeyer

Fourmigué

Caney

et al. 2014

MATEC Web of Conferences

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Abstract. Numerical simulations using CFD are conducted on a boiling two-phase flow in order to study the changes in flow patterns during evaporation. A model for heat and mass transfer at the tube inner wall and at the liquid-gas interface is presented. Transport of two custom scalars is solved: one stands for the enthalpy fields in the flow, the other represents a new dispersed vapor phase in the liquid. A correlation is used to model heat and mass transfer at the tube inner wall. The dispersed phase is created at the surface in the liquid and flows up to the liquid-vapor interface. There, it is transformed into actual vapor phase. The multiphase VOF model is validated for the creation of slugs in an horizontal tube for an adiabatic flow. Results are presented for a subcooled boiling flow in a bend.

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Experimental investigation and CFD simulation of horizontal stratified two-phase flow phenomena

Cited by 86 publications

References 12 publications

Experimental and Numerical Analysis of Egg-Shaped Sewer Pipes Flow Performance

Experimental and Numerical Analysis of Egg-Shaped Sewer Pipes Flow Performance

Numerical characterisation of slug flow in horizontal air/water pipe flow

Numerical simulation of evaporating two-phase flow: application to concentrated solar plants with direct steam generation

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