Experimental and Computational Investigation of an Air Core Inside a Milling Circuit Hydroclone

2017 ◽  
Author(s):  
J. R. Kadambi ◽  
C. Shingote ◽  
R. Ke ◽  
Z. Tian ◽  
J. Furlan ◽  
...  
Keyword(s):  
Flow Field ◽  
Flow System ◽  
Industrial Applications ◽  
Solid Particles ◽  
Test Fluid ◽  
Multiphase Model ◽  
Phase Flow ◽  
Computational Results ◽  
Number Range ◽  
Air Core

Hydrocyclone separators are widely used in various industrial applications in the oil and mining industries to sort, classify and separate solid particles or liquid droplets within liquid suspensions. Often, studies in the literature have investigated idealized and simplified geometries, which are also typically scaled down to very small sizes. In this study, the two phase flow system inside a transparent acyclic model with actual milling circuit cyclone hydraulics was investigated computationally and experimentally. The diameter and height of the hydrocyclone are 12.7 cm and 94 cm, respectively. In many industrial applications, a single phase flow system in a hydrocyclone is a rarity, since nearly all cyclones have an underflow which is open to atmosphere, and therefore an air core is present along the central axis. In this study, the flow field with an air core present has been investigated. The computational modelling was conducted using Star CCM+, a commercial Computational Fluid Dynamics (CFD) software package. Large Eddy Simulation (LES) and the Volume of Fluid multiphase model was used. Additionally, the computational studies also focused on the prediction of the dimensions of the air core, which were measured experimentally. The tests were conducted in the Reynolds number range of 20,000–150,000 and 9000–67,800 for the water and NaI solution respectively. The model hydrocyclone was made of optically transparent acrylic plastic with flat, smooth outer surfaces so that there were no reflections, distortions, or obstructions. Refractive index matching, to minimize refraction effects, between the test fluid and acrylic test piece was achieved using a test liquid of sodium iodide aqueous solution (63.3% NaI by weight). Images of the flow field with the air core were taken using a Canon DSLR camera. A comparison between the experimental data and the computational results were made in the r-z plane. The experimental results and the computational results will be discussed in this paper.

Particle Image Velocimetry Measurements of Flow Inside a Hydrocyclone With an Air Core

2018 ◽  
Author(s):  
Chinmay Shingote ◽  
John Furlan ◽  
Jaikrishnan Kadambi ◽  
Robert Visintainer ◽  
Renjie Ke ◽  
...  
Keyword(s):  
Refractive Index ◽  
Particle Image Velocimetry ◽  
Computational Models ◽  
Particle Image ◽  
Solid Particles ◽  
Test Fluid ◽  
Tangential Plane ◽  
Air Content ◽  
Air Core ◽  
Image Velocimetry

Hydrocyclone separators are widely used in the oil and mining industries to sort, classify and separate solid particles or liquid droplets within liquid suspensions. In this study, the liquid-air flow inside a mining hydrocyclone is investigated using particle image velocimetry (PIV). Previous work completed by Ke (2016), using the same technique and experimental setup as the current study, mainly focused on the flow velocities in the radial-tangential plane within a hydrocyclone running with an air core. Due to optical limitations, the velocity measurements in the radial-tangential plane were limited to the inlet head. Previous work by Chinmay et al (FEDSM 2017) was also performed which concentrated mainly on the dimensions of the air core. The study revealed several physical phenomena and flow patterns of the multi-phase flow in a hydrocyclone. An air core is generated along the central axis of the hydrocyclone, as the underflow is open to atmosphere. In this study, the flow field in the radial-axial (r-z) plane has been investigated, and measurements have been obtained in the conical regions outside of the inlet head including the center (axially) of the cyclone. Particle Imaging Velocimetry (PIV) method was used with a laser as the light source in order to obtain experimental data for the purpose of developing and validating computational models of hydrocyclone flows. Refractive index matching technique was used, with the hydrocyclone model being made of clear acrylic material. The test liquid used in the experiments was sodium iodide aqueous solution (63.3% NaI by weight), in order to achieve a refractive index match between the curved inner cyclone walls and test fluid. The seed particles used in the experiments were 10 μm silver coated hollow glass spheres which were introduced into the flow by global seeding. Three fields of view (FOV) were investigated in the r-z plane of the hydrocyclone. Two dimensional velocity vector maps were obtained in each of the fields of view. Additionally, a SONARtrac unit was installed in the overflow piping in order to measure the % air content of the cyclone overflow. The PIV and % air content measurements will be presented and discussed.

2D Simulation of the Gas-Solid Two Phase Flow inside the Abrasive Jet (AJ) Nozzle

2008 ◽  
Vol 53-54 ◽  
pp. 369-373
Author(s):  
Rong Guo Hou ◽  
Chuan Zhen Huang ◽  
Y.S. Feng ◽  
Y.Y. Liu
Keyword(s):  
Flow Field ◽  
Two Phase Flow ◽  
Cone Angle ◽  
Multiphase Model ◽  
Phase Flow ◽  
Fatigue Wear ◽  
Two Phase ◽  
2D Simulation ◽  
Jet Nozzle ◽  
Simulation Results

The simulation of the gas-solid two phase flow inside the abrasive jet nozzle is studied by the computed dynamic software (CFD)-FLUENT, the velocity field of the two phase flow and the trajectory of the abrasive inside the nozzle are obtained. The Eulerian multiphase model and the DPM model have been used to compute the two-phase flow field. The simulation results express that the velocity of the jet is slow at the inlet, while it will be increased with the area of the section decreasing, the cone angle of the nozzle affects the flow field very much, the flow has low turbulence and the gradient of the velocity is small when the cone angle is small, while the velocity of the flow increased rapidly and the gradient of the velocity is big when the cone angle increasing. The simulation results also express that the arc radius affects the flow field greatly, the flow will move more smoothly when the arc radius is large. The pressure field of the wall expresses that the nozzle will wear rapidly at the corner of the nozzle, the reason is that the pressure is big or changed greatly, the fatigue wear and the blast wear will happen at those place.

Characterizing the Onset of Gas Entrainment in a Single Discharging Bottom Branch Through Flow Visualization

2006 ◽  
Author(s):  
R. C. Bowden ◽  
I. G. Hassan
Keyword(s):  
Flow Field ◽  
Two Phase Flow ◽  
Solid Wall ◽  
Vertical Plane ◽  
Industrial Applications ◽  
Liquid Region ◽  
Primary Concern ◽  
Phase Flow ◽  
Two Phase ◽  
Gas Entrainment

The incipience of two-phase flow in discharging branches, from a stratified gas-liquid region, has major implications in industrial applications where safety is of primary concern. The transition from single phase liquid to a two phase gas-liquid mixture is termed the onset of gas entrainment, and may be formed by either vortex or vortex-free mechanisms. The two phase flow quality in the discharging branch is greatly impacted by vortex-free gas entrainment, as compared with gas entrainment due to vortex formation. Presented is a preliminary experimental investigation to demonstrate quantitative measurements of the liquid flow field at the onset of gas entrainment in a single discharging bottom branch. The three dimensional flow field is resolved into three horizontal planes and a single vertical plane. Results indicate a strong dependency of the flow field on the radial component, directed toward the branch center, and where a solid wall is present a larger tangential component.

Status of Advanced Two-Phase Flow Model Development for SRM Chamber Flow Field and Combustion Modeling

2004 ◽  
Author(s):  
Gary Luke ◽  
Mark Eagar ◽  
Michael Sears ◽  
Scott Felt ◽  
Bob Prozan
Keyword(s):  
Flow Field ◽  
Flow Model ◽  
Two Phase Flow ◽  
Model Development ◽  
Phase Flow ◽  
Two Phase ◽  
Combustion Modeling

scholarly journals Numerical simulation of gas-solid flow in an interconnected fluidized bed

2015 ◽  
Vol 19 (1) ◽  
pp. 317-328 ◽  
Author(s):  
Giuseppe Canneto ◽  
Cesare Freda ◽  
Giacobbe Braccio
Keyword(s):  
Numerical Simulation ◽  
Fluidized Bed ◽  
Experimental Tests ◽  
Solid Particles ◽  
Multiphase Model ◽  
Cold Model ◽  
Conservation Equations ◽  
Solid Flow

The gas-particles flow in an interconnected bubbling fluidized cold model is simulated using a commercial CFD package by Ansys. Conservation equations of mass and momentum are solved using the Eulerian granular multiphase model. Bubbles formation and their paths are analyzed to investigate the behaviour of the bed at different gas velocities. Experimental tests, carried out by the cold model, are compared with simulation runs to study the fluidization quality and to estimate the circulation of solid particles in the bed.

Multiple Flow Patterns and Heat Transfer in Confined Jet Impingement

2002 ◽  
Author(s):  
X. Li ◽  
J. L. Gaddis ◽  
T. Wang
Keyword(s):  
Heat Transfer ◽  
Flow Field ◽  
Boundary Conditions ◽  
Jet Impingement ◽  
Flow Patterns ◽  
Computational Results ◽  
Initial Flow ◽  
Flow Parameters ◽  
Visualization Experiment ◽  
Exit Boundary

The flow field of a 2-D laminar confined impinging slot jet is investigated. Numerical results indicate that there exist two different solutions in some range of geometric and flow parameters. The two steady flow patterns are obtained under identical boundary conditions but only with different initial flow fields. Three different exit boundary conditions are investigated to eliminate artificial effects. The different flow patterns are observed to significantly affect the heat transfer. A flow visualization experiment is carried out to verify the computational results and both flow patterns are observed. The bifurcation mechanism is interpreted and discussed.

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