computational fluid dynamics applied to the analysis of 10-mm hydrocyclone solids separation...
TRANSCRIPT
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Computational Fluid Dynamics Applied to the Analysis of 10-mm Hydrocyclone Solids Separation
Performance
S. A. Grady, M. M. Abdullah, and G. D. Wesson
Department of Chemical Engineering Florida A&M University/Florida State University
College of Engineering
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Presentation Outline
Research Objectives Experimental Procedures Solution Details Results Conclusions Continued Work Acknowledgments
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Research Objectives Develop Flow Field Predictions for Reynolds
Stress Turbulence Model Comparison of Flow Field Properties for
Different Geometries
Validate Flow Field Prediction Solid Particle Motion
Apply Drop Break-up Model with Separation for Liquid/Liquid Systems
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Experimental Procedure
10-mm Geometry Develop Grid Establish Boundary Conditions Perform RSM Simulation Using
FLUENT Identify Appropriate Flow Structures
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3-D Cyclone Grid
Tangential Inlet Configuration
Volute Inlet Configuration
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Grid Information
Tangential Inlet Hexahedral and
Tetrahedral Cells 532,863 cells 1,095,577 faces
Volute Inlet Hexahedral Cell Type
175,506 cells 544,937faces
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Boundary Conditions
Flow Split Inlet Volumetric Flow Rate
Plug flow profile normal to inlet face
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Results
Velocity profilesVelocity vectorsCore properties
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Axial Velocity ProfilesAxial Velocity (L/D=4)
-2.5
-2
-1.5
-1
-0.5
0
0.5
1
1.5
2
-0.005 -0.004 -0.003 -0.002 -0.001 0 0.001 0.002 0.003 0.004 0.005
Position (m)
Ve
loc
ity
(m
/s)
volute tangential
Axial Velocity (L/D=3)
-1.5
-1
-0.5
0
0.5
1
1.5
-0.004 -0.003 -0.002 -0.001 0 0.001 0.002 0.003 0.004
Position (m)V
elo
cit
y (
m/s
)volute tangential
Axial Velocity (L/D=2)
-1.4
-1.2
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
-0.003 -0.002 -0.001 0 0.001 0.002 0.003
Position (m)
Ve
loc
ity
(m
/s)
volute tangential
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Tangential Velocity ProfilesTangential Velocity (L/D=4)
-4
-3.5
-3
-2.5
-2
-1.5
-1
-0.5
0
0.5
-0.005 -0.004 -0.003 -0.002 -0.001 0 0.001 0.002 0.003 0.004 0.005
Position (m)
Vel
oci
ty (
m/s
)
volute tangential
Tangential Velocity (l/D=3)
-2.5
-2
-1.5
-1
-0.5
0
-0.004 -0.003 -0.002 -0.001 0 0.001 0.002 0.003 0.004
Position (m)
Vel
coit
y (m
/s)
volute tangential
Tangential Velocity (L/D=2)
-1.6
-1.4
-1.2
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
-0.003 -0.002 -0.001 0 0.001 0.002 0.003
Position (m)
Vel
oci
ty (
m/s
)
volute tangential
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Velocity Vectors
Volute Inlet ConfigurationTangential Inlet Configuration
ZY
X
Velocity Vectors Colored By Axial Velocity (m/s)FLUENT 5.1 (3d, segregated, RSM)
Oct 25, 1999
8.29e+00
6.36e+00
4.43e+00
2.51e+00
5.82e-01
-1.34e+00
-3.27e+00
-5.20e+00
-7.12e+00
Z
Y X
Velocity Vectors Colored By Axial Velocity (m/s)FLUENT 5.1 (3d, segregated, RSM)
Oct 25, 1999
9.20e+00
7.14e+00
5.09e+00
3.03e+00
9.76e-01
-1.08e+00
-3.13e+00
-5.19e+00
-7.24e+00
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Turbulence Intensity
Z
Y X
Velocity Vectors Colored By Turbulence IntensityFLUENT 5.1 (3d, segregated, RSM)
Oct 25, 1999
2.06e+00
1.86e+00
1.66e+00
1.45e+00
1.25e+00
1.04e+00
8.41e-01
6.37e-01
4.33e-01
2.30e-01
2.58e-02
Z
Y X
Velocity Vectors Colored By Turbulence IntensityFLUENT 5.1 (3d, segregated, RSM)
Oct 25, 1999
2.06e+00
1.86e+00
1.66e+00
1.45e+00
1.25e+00
1.04e+00
8.41e-01
6.37e-01
4.33e-01
2.30e-01
2.58e-02
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Pressure Distribution
Z
Y X
Velocity Vectors Colored By Total Pressure (pascal)FLUENT 5.1 (3d, segregated, RSM)
Oct 25, 1999
5.54e+04
4.74e+04
3.94e+04
3.15e+04
2.35e+04
1.55e+04
7.47e+03
-5.18e+02
-8.51e+03
-1.65e+04
-2.45e+04
Z
Y X
Velocity Vectors Colored By Total Pressure (pascal)FLUENT 5.1 (3d, segregated, RSM)
Oct 25, 1999
5.54e+04
4.74e+04
3.94e+04
3.15e+04
2.35e+04
1.55e+04
7.47e+03
-5.18e+02
-8.51e+03
-1.65e+04
-2.45e+04
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Locus of Zero Axial Velocity
Z
Y X
Contours of Axial Velocity (m/s)FLUENT 5.1 (3d, segregated, RSM)
Oct 25, 1999
0.00e+00
0.00e+00
Z
Y X
Contours of Axial Velocity (m/s)FLUENT 5.1 (3d, segregated, RSM)
Oct 25, 1999
0.00e+00
0.00e+00
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Locus of Zero Tangential Velocity
Z
Y X
Contours of Tangential Velocity (m/s)FLUENT 5.1 (3d, segregated, RSM)
Oct 25, 1999
0.00e+00
0.00e+00
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Conclusions
Volute Inlet Configuration Provides Greater symmetry about the axis of symmetry Lower turbulence intensity
Reynolds Stress Model Predictions Provide
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Continued Work
Model Validation Based on Separation Principles Particle migration analysis Turbulence intensity based drop break-up
analysis
Model Validation Based on LDV Experiments
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Acknowledgements
FAMU/NASA Graduate Fellowship Program
Florida A&M University Foundation