simulation of a fluidized bed characteristics using...
TRANSCRIPT
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Simulation of a Fluidized Bed Characteristics
using Discrete Element Method (DEM) and
Computational Fluid Dynamics (CFD) through
EDEM-FLUENT Coupling
Daniel Portioli Sampaio - Unicamp
Prof. Dr. José Roberto Nunhez – Unicamp
Dr. Nicolas Spogis – ESSS
Daniel Schiochet Nasato - ESSS
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Agenda
• Objectives
• Literature review
• Simulations
• Conclusions
• Next steps
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• Use EDEM coupled to CFD to evaluate its potential use for
fluidized beds based on literature review;
• Perform experimental tests in a fluidized bed;
• Reproduce in the simulations the experimental behavior of
the fluidized bed.
Objectives
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Literature review
• Different types of fluidized bed
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Simple test case
Airflow inlet (FLUENT)
Airflow Outlet
Particles Factory (EDEM)Bottom
(EDEM)
• Based on literature review a simple test case was made
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First studies
• Fluidized bed simulated for
different times – Fluid velocity
5 m/s
• Review from literature - Fluid
velocity 2.5 m/s
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Experimental test
• Equipment used for experimental tests
• It was used a distribution plate with 6 holes
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Experimental test
• Fluidized bed characteristics;
• Polystyrene spheres.
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Experimental data
• Fluidization curve - Pa x
Velocity [cm/s]
• Blank obtained in the
distribution plate
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• CFD Mesh constructed in ICEM – Hexahedrical mesh
• Air inlet was simulated as totally opened. It was not
considered the distribution plate with 6 holes
FLUENT Mesh
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• Fluidized bed characteristics for 0.1 m/s
Results for 0.1 m/s
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• Fluidized bed characteristics for 0.26 m/s
Results for 0.26 m/s
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• Pressure drop for 0.1 m/s
and 0.26 m/s
• Air velocity profile for 0.1 m/s
and 0.26 m/s
Velocity and pressure drop
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Conclusions
• Simulations showed good qualitative results. Similar
phenomena to experimental tests could be captured.
• Pressure difference from experiments can be caused by lack
of the distribution plate details in the simulation.
• All simulations used the Ergun Drag Model. Di Felice drag
model could give better results for it considers mass fraction,
but the convergence was not good;
• Electrostatic forces between particles was not considered.
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Next Steps
• Consider distribution plate details in the simulation;
• Try using Di Felice drag model for simulations with a more
conservative time step;
• Use another type of fluidized bed to make possible using
particles of higher density – reduce electrostatic effects.
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Acknowledgments
• We would like to thank Professor Sandra Cristina Rocha for
kindly lend us the fluidized bed and polystyrene for the
experimental runs.