Co-current stratified gas–liquid downflow—Influence of the liquid flow field on interfacial structure

2005 ◽  
Vol 31 (8) ◽  
pp. 869-896 ◽  
Author(s):  
J.S. Lioumbas ◽  
S.V. Paras ◽  
A.J. Karabelas
Keyword(s):  
Flow Field ◽  
Liquid Flow ◽  
Interfacial Structure

Reconstruction of Axisymmetric Liquid Flow Field in Digital Holographic Interferometry

2015 ◽  
Author(s):  
Jianglei Di ◽  
Minru Li ◽  
Shan Kang ◽  
Yang Gao ◽  
Jiajun Li ◽  
...  
Keyword(s):  
Flow Field ◽  
Liquid Flow ◽  
Holographic Interferometry

CFD Simulation of Gas Dispersion in a Stirred Tank of Dual Rushton Turbines

2017 ◽  
Vol 15 (4) ◽  
Author(s):  
Xinju Li ◽  
Xiaoping Guan ◽  
Rongtao Zhou ◽  
Ning Yang ◽  
Mingyan Liu
Keyword(s):  
Flow Field ◽  
Size Distribution ◽  
Liquid Flow ◽  
Bubble Size ◽  
Great Influence ◽  
Gas Holdup ◽  
Bubble Size Distribution ◽  
Stirred Tank ◽  
Treatment Methods ◽  
Gas Dispersion

Abstract3D Eulerian-Eulerian model was applied to simulate the gas-liquid two-phase flow in a stirred tank of dual Rushton turbines using computational fluid dynamics (CFD). The effects of two different bubble treatment methods (constant bubble sizevs. population balance model, PBM) and two different coalescence models (Luo modelvs. Zaichik model) on the prediction of liquid flow field, local gas holdup or bubble size distribution were studied. The results indicate that there is less difference between the predictions of liquid flow field and gas holdup using the above models, and the use of PBM did not show any advantage over the constant bubble size model under lower gas holdup. However, bubble treatment methods have great influence on the local gas holdup under larger gas flow rate. All the models could reasonably predict the gas holdup distribution in the tank operated at a low aeration rate except the region far from the shaft. Different coalescence models have great influence on the prediction of bubble size distribution (BSD). Both the Luo model and Zaichik model could qualitatively estimate the BSD, showing the turning points near the impellers along the height, but the quantitative agreement with experiments is not achieved. The former over-predicts the BSD and the latter under-predicts, showing that the existing PBM models need to be further developed to incorporate more physics.

In the Tundish Flow State in the ANSYS Simulation

2013 ◽  
Vol 631-632 ◽  
pp. 696-699
Author(s):  
Tian Biao Huang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Flow Field ◽  
Liquid Flow ◽  
Flow Characteristics ◽  
Element Model ◽  
Control Device ◽  
Flow State ◽  
Ansys Simulation ◽  
Flow Control Device

Through the establishment of ANSYS tundish steel liquid flow finite element model analysis of finite element method in simulating the flow field in tundish for applications. comparison with and without flow control device of liquid steel in tundish flow characteristics the results have guiding significance for practical production.

Finite pointset method for simulation of the liquid–liquid flow field in an extractor

2008 ◽  
Vol 32 (12) ◽  
pp. 2946-2957 ◽  
Author(s):  
Christian Drumm ◽  
Sudarshan Tiwari ◽  
Jörg Kuhnert ◽  
Hans-Jörg Bart
Keyword(s):  
Flow Field ◽  
Liquid Flow

Visualization of Confined Jet Impingement With Boiling Using Time-Resolved Stereo-PIV

2015 ◽  
Author(s):  
Matthew J. Rau ◽  
Tianqi Guo ◽  
Pavlos P. Vlachos ◽  
Suresh V. Garimella
Keyword(s):  
Flow Field ◽  
Heat Source ◽  
Liquid Flow ◽  
Heated Surface ◽  
Jet Impingement ◽  
Vapor Flow ◽  
Wall Jet ◽  
Phase Flow ◽  
Two Phase ◽  
Time Resolved

Two-phase liquid-vapor flow field measurements of confined jet impingement with boiling are performed using time-resolved stereo particle image velocimetry (stereo-PIV). A single circular jet of water, impinges normally from a 3.75 mm-diameter orifice onto a submerged circular heat source at an orifice-to-target spacing of 4 jet diameters. The impinging jet outflow including the vapor generated at the heat source are confined between the jet orifice plate and the bottom test section wall. Fluorescent seeding particles (10 μm in diameter) and time-resolved PIV measurements (taken at a sampling rate of 750 Hz) allow for imaging of the instantaneous interactions between the liquid and vapor structures. Liquid-phase velocity vectors within the two-phase flow field (with high vapor fractions) are presented as a function of heat flux at jet Reynolds numbers of 5,000 and 15,000 and contrasted with single-phase flow. The time-resolved measurements are used to highlight the influence of the vapor phase on the liquid flow field. It is found that bubble formation effectively blocks the developing wall-jet flow on the heated surface. The resulting liquid flow field in the confinement gap is dominated by vapor motion rather than by the entrainment from the developing wall jet.

Solid-Liquid Flow-Induced Erosion Prediction in Three-Dimensional Pump Casing

2009 ◽  
Author(s):  
Krishnan V. Pagalthivarthi ◽  
Robert J. Visintainer
Keyword(s):  
Wear Rate ◽  
Flow Field ◽  
Liquid Flow ◽  
Three Dimensional ◽  
Surface Wear ◽  
Two Phase ◽  
Erosion Prediction ◽  
Water Region ◽  
High Erosion Rate ◽  
Solid Liquid

Solid-liquid flow-induced erosion wear prediction in a typical three-dimensional pump casing is dealt with. The two-phase flow field inside the three-dimensional pump casing is simulated using finite element modeling of mono-size particulate flow. Using this flow field and the concentration along the casing surface, wear rate is calculated using empirically determined wear coefficients. Wear rate along the three-dimensional casing surface and the location of high erosion rate are examined. Results show that the wear rate distribution is high near the cut water region (the region separating the total flow from the discharge flow). Wear is non-uniformly distributed and is high at some local spots. Even along other radial sections, wear rate varies significantly from the sides to the centerline of the casing.

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