Large Eddy Simulation of the Gas–Liquid Flow in a Cylindrical Cross-Sectioned Bubble Column

2012 ◽  
Vol 170-173 ◽  
pp. 2703-2707
Author(s):  
W.L. Wei ◽  
X.J. Zhao ◽  
Y.L. Liu ◽  
X.F. Yang
Keyword(s):  
Liquid Flow ◽  
Bubble Column ◽  
Numerical Study ◽  
Equations Of Motion ◽  
Transient Behavior ◽  
Bubble Columns ◽  
Two Phase ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Gas Liquid Flow

This paper is concerned with the numerical study of gas–liquid flow in bubble columns by large eddy simulations (LES). The Euler–Euler approach is used to describe the equations of motion of the two-phase flow. The mean velocities and the fluctuating velocities are obtained. It is found that, when the drag, lift and virtual mass forces are used, the computed results in agreement with experimental transient behavior can be captured.

scholarly journals Euler-Euler large eddy simulations of the gas–liquid flow in a cylindrical bubble column

2020 ◽  
Vol 369 ◽  
pp. 110823
Author(s):  
Mojtaba Goraki Fard ◽  
Youssef Stiriba ◽  
Bouchaib Gourich ◽  
Christophe Vial ◽  
Francesc Xavier Grau
Keyword(s):  
Liquid Flow ◽  
Bubble Column ◽  
Large Eddy Simulations ◽  
Large Eddy ◽  
Gas Liquid Flow

scholarly journals Large-Eddy Simulation of Light-Round in an Annular Combustor With Liquid Spray Injection and Comparison With Experiments

2017 ◽  
Author(s):  
Théa Lancien ◽  
Kevin Prieur ◽  
Daniel Durox ◽  
Sébastien Candel ◽  
Ronan Vicquelin
Keyword(s):  
Large Eddy Simulation ◽  
Flame Propagation ◽  
High Speed ◽  
Complex Geometry ◽  
Numerical Study ◽  
Ignition Process ◽  
Two Phase ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Annular Combustor

A combined experimental and numerical study of light-round, defined as the flame propagation from burner to burner in an annular combustor, under perfectly premixed conditions has previously demonstrated the ability of large-eddy simulation (LES) to predict such ignition processes in a complex geometry using massively parallel computations. The present investigation aims at developing light-round simulations in a configuration closer to real applications by considering liquid n-heptane injection. The large-eddy simulation of the ignition sequence of a laboratory scale annular combustion chamber comprising sixteen swirled two-phase injectors is carried out with a mono-disperse Eulerian approach for the description of the liquid phase. The objective is to assess this modeling approach to describe the two-phase reactive flow during the ignition process. The simulation results are compared in terms of flame structure and light-round duration to the corresponding experimental images of the flame front recorded by a high-speed intensified CCD camera. The dynamics of the flow is also analyzed to identify and characterize mechanisms controlling flame propagation during the light-round process.

Numerical Simulation of the Transient Three-Dimensional Gas-Liquid Flow in a Cylindrical Bubble Column

2006 ◽  
Author(s):  
Santiago Lai´n Beatove ◽  
Martin Sommerfeld
Keyword(s):  
Liquid Flow ◽  
Bubble Column ◽  
Three Dimensional ◽  
Dynamic Structure ◽  
Point Of View ◽  
Pressure Drag ◽  
Eddy Simulation ◽  
Discrete Phase ◽  
Quantitative Results ◽  
Gas Liquid Flow

In this paper the transient three-dimensional flow developing in a cylindrical laboratory bubble column is addressed from a numerical point of view. The simulation scheme combines a Large Eddy Simulation (LES) for describing the liquid phase and a Lagragian approach for the gas (discrete) phase. The bubble equation of motion considers all the relevant forces, i.e., buoyancy, pressure, drag, added mass and transverse lift. From the calculations, the transverse lift in combination with the drag is identified as the main mechanism allowing the bubbles to spread over the column cross-section. The liquid and gas velocity profiles obtained are compared with the experimental data and k–ε results presented in Lai´n et al. (2001). As a matter of fact, the dynamic structure of the liquid flow induced by the rising bubbles is well reproduced and also good quantitative results for all measured variables of both phases, gas and liquid, are obtained.

scholarly journals Transient CFD simulations of turbulent liquid - liquid flow in a Kenics static mixer. Radial and tangential velocities

2009 ◽  
Vol 11 (2) ◽  
pp. 36-40 ◽  
Author(s):  
Halina Murasiewicz ◽  
Zdzislaw Jaworski
Keyword(s):  
Liquid Flow ◽  
Liquid Mixture ◽  
Static Mixer ◽  
Cfd Simulations ◽  
Two Phase ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Transient Simulations ◽  
Phase Liquid ◽  
Two Phases

Transient CFD simulations of turbulent liquid - liquid flow in a Kenics static mixer. Radial and tangential velocities The results of modelling of the two-phase turbulent flow of a two-phase, liquid-liquid mixture in a Kenics static mixer were reported. Advanced transient simulations were performed using the large eddy simulation (LES) approach and a broader analysis of the velocity field was carried out. The two-phase flow was modelled employing the Eulerian approach in the pseudo-homogeneous version of the mixture model. Three cases were again considered, which differed by the density of the two phases and the simulations were performed for Reynolds number of 10,000. The LES results for the tangential and radial components were compared with those obtained in the steady-state RANS approach.

scholarly journals Experimental and Numerical Study on Gas-Liquid Flow in Hilly-Terrain Pipeline-Riser Systems

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Zhaoyang He ◽  
Limin He ◽  
Haixiao Liu ◽  
Dan Wang ◽  
Xiaowei Li ◽  
...  
Keyword(s):  
Flow Pattern ◽  
Liquid Flow ◽  
Slug Flow ◽  
Gas Transport ◽  
Numerical Study ◽  
Pipeline System ◽  
Hilly Terrain ◽  
Two Phase ◽  
Gas Liquid Flow ◽  
Stable Flow

In offshore oil and gas transport, gas-liquid mixed transport is a basic flow phenomenon. In general, pipeline undulations are caused by seabed topography; therefore, it is of great significance to study the mechanisms underlying gas and liquid flows in hilly-terrain pipeline-riser systems. This study established a hilly-terrain pipeline-riser experimental system in an indoor laboratory. The flow pattern and its flow mechanism were studied via experimental observation and pressure detection. Experimental results showed that the gas-liquid flow pattern in the hilly-terrain pipeline-riser system can be divided into four types: severe slugging, dual-peak slug, oscillation flow, and stable flow, where dual-peak slug flow is a special flow pattern in this pipeline system. Hilly-terrain units obstruct the downstream gas transport, weaken the gas-liquid eruption in the riser, and increase the cycle of severe slugging. In this paper, gas is regarded as power in the flow of gas and liquid, and the accumulation of liquid in low-lying areas is regarded as an obstacle. Then, the moment of gas-liquid blowout is studied as main research object, and the mechanism of flow pattern transformation is described in detail. This study investigated the accuracy of the OLGA 7.0 simulation results for the gas-liquid two-phase flow in the hilly-terrain pipeline-riser. The results show that OLGA 7.0 achieves a more accurate calculation of severe slugging and stable flow and can predict both the pressure trend and change characteristics. However, the simulation accuracies for dual-peak slug flow and oscillation flow are poor, and the sensitivity to gas changes is insufficient.

Large eddy simulation of the gas–liquid flow in a stirred tank

AIChE Journal ◽  
2008 ◽  
Vol 54 (8) ◽  
pp. 1963-1974 ◽  
Author(s):  
Yanhong Zhang ◽  
Chao Yang ◽  
Zai‐Sha Mao
Keyword(s):  
Large Eddy Simulation ◽  
Liquid Flow ◽  
Stirred Tank ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Gas Liquid Flow
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