Prediction of gas-liquid two-phase mixture flow in a vertical pipe with a sudden expansion in diameter

2000 ◽  
Vol 71 (5) ◽  
pp. 153-160 ◽  
Author(s):  
Natsuo Hatta ◽  
Masaaki Omodaka ◽  
Fumitaka Nakajima ◽  
Hitoshi Fujimoto ◽  
Hirohiko Takuda
Keyword(s):  
Sudden Expansion ◽  
Vertical Pipe ◽  
Two Phase ◽  
Mixture Flow ◽  
Phase Mixture

scholarly journals Numerical Model for Gas-Liquid Two-Phase Mixture Flow in a Vertical Pipe with a Sudden Enlargement in Diameter.

1998 ◽  
Vol 114 (7) ◽  
pp. 475-482
Author(s):  
Natsuo HATTA ◽  
Masaaki OMODAKA ◽  
Takahiro TAKATSU ◽  
Hitoshi FUJIMOTO ◽  
Hirohiko TAKUDA ◽  
...  
Keyword(s):  
Numerical Model ◽  
Vertical Pipe ◽  
Two Phase ◽  
Mixture Flow ◽  
Sudden Enlargement ◽  
Phase Mixture

3D Cavitations Turbulent Transient Calculation in the Francis Turbine Model

2012 ◽  
Vol 479-481 ◽  
pp. 2466-2470
Author(s):  
Dun Zhang ◽  
Yuan Zheng
Keyword(s):  
Model Experiment ◽  
Flow Model ◽  
Three Dimensional ◽  
Francis Turbine ◽  
Two Phase ◽  
Mixture Flow ◽  
Phase Mixture ◽  
Simulation Results ◽  
Accurate Numerical Solution ◽  
Turbine Model

Analysis had been carried out, based on the three-dimensional transient viscous turbulent calculation of a Francis turbine full flow field, the complete cavitations model and the two-phase mixture flow model were combined during the calculation, more accurate numerical solution had been obtained. According to the simulation results, the site and extent of cavitations in the turbine flow were reflected within the specific conditions, and were more consistent with the cavitations phenomenon observed in the model experiment, also provided a reference for the more in-depth research.

scholarly journals A CFD model of a two-phase mixture flow in a test stand for air-borne particle analysis

2017 ◽  
Vol 4 (20) ◽  
pp. 343-358
Author(s):  
Marta Stachnik ◽  
Gabriel Czachor ◽  
Marek Jakubowski
Keyword(s):  
Dust Particles ◽  
Particle Analysis ◽  
Fine Dust ◽  
Cfd Model ◽  
Small Particles ◽  
Two Phase ◽  
Mixture Flow ◽  
Dust Clouds ◽  
Air Cleaner ◽  
Phase Mixture

Farmers come across many materials which when being handled generate dust clouds. Even with low concentration these might pose risk of explosion and can carry dangerous microorganisms. To broaden the knowledge about fine dust particles sedimentation and analyze process of particles becoming air-borne, a tunnel air cleaner was designed. Based on the experiment, a CFX simulation was performed using the Eulerian approach and the CFX12.1 software. Presented model is a stedy state two-phase analysis of dust sedimentation. The results show mechanism of dust dispertion over large distance, such as regions of vorticity that seem to be main motor. Presented analysis emphasizes how easily small particles can become resuspended in the air and carried over distance. Acquired knowledge can be applied for safety regulation in many branches of agriculture.

Study of an Entrapped Air Pocket due to Sloshing Using Experiments and Numerical Simulations

2017 ◽  
Author(s):  
Reza Firoozkoohi ◽  
Bjørn Christian Abrahamsen ◽  
Odd Magnus Faltinsen
Keyword(s):  
Free Surface ◽  
Test Case ◽  
Two Phase ◽  
Mixture Flow ◽  
Flow Solver ◽  
Air Pocket ◽  
Spring System ◽  
Phase Mixture ◽  
Entrapped Air ◽  
Mass Spring

The capability of the OpenFoam software to model slamming where air is entrapped between the free surface and the structure is investigated. The test case studied is a previously studied phenomenon, where an air pocket is entrapped between the free surface and the upper corner of a rectangular tank during sloshing. The air is entrapped due to the shape of the wave approaching the roof. The air pocket is compressed and starts to oscillate. The oscillations resemble the free oscillations of a mass spring system. OpenFoam results are compared with experiments and a numerical method based on a boundary element method (BEM) both of which are available from the previous study. In this work a compressible VOF (Volume Of Fluid) Eulerian two-phase mixture flow solver called compressible InterFoam from OpenFOAM package is used to perform the simulations. The sensitivity of the results to numerical parameters is addressed.

Study of the Influence of Labyrinth Seal Clearance on Gearbox Leakage with Gas-Fluid Two-Phase Mixture

2015 ◽  
Vol 789-790 ◽  
pp. 231-235 ◽  
Author(s):  
Wei Dong He ◽  
Chen Wang ◽  
Ying Hui Zhang
Keyword(s):  
Numerical Calculation ◽  
Fluid Flows ◽  
Labyrinth Seal ◽  
Grid Size ◽  
Two Dimensional ◽  
Two Phase ◽  
Mixture Flow ◽  
Fluent Software ◽  
Phase Mixture ◽  
Gap Width

Established two-dimensional axisymmetric staggered tooth shape labyrinth seal grid model by GAMBIT software, simulated oil-air two-phase mixture flow field within labyrinth seal by fluent software, confirmed the best grid size of numerical calculation, studied the seal mechanism and influence of gap width variation on the leakage. The results show that when fluid flows through the narrow clearance, its velocity increases and pressure decreases. The optimized clearance width within 0.5mm to 1.0mm is preferable.

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