Numerical Simulation of A Cubic Spout-Fluid Bed: Influences of Inlet Gas Temperature and Jet to Bed Cross-Section Ratio
-
Ali Rahmani
,
Mohsen Tamtaji
Abstract
In this paper, we study the role of inlet gas temperature and jet to bed cross-section ratio on hydrodynamics and circulation patterns of particles in a spout-fluid bed. The system is modeled using CFD-TFM approach based on Eulerian-Eulerian method. Simulation results are validated by experimental data measured by (Link 2008. “PEPT and Discrete Particle Simulation Study of Spout-fluid Bed Regimes.” Aiche Journal 54 (5): 1189–202). First, the sensitivity analysis of simulation results versus the most significant parameters are conducted to find the optimum values for each parameter. Subsequently, the role of inlet gas temperature and cross-section ratios are studied in detail. The simulation results clearly demonstrate that increasing the inlet gas temperature raises particles’ velocity in the bed and affects the circulation pattern in annulus region. Additionally, it is shown that higher gas temperature leads to existence of hot spots in the annulus region. In case of jet to bed cross-section ratio, using larger ratios results in higher velocities and lower pressure drop along the bed.
Acknowledgements
The authors would like to thank Sharif University of Technology (Tehran, Iran) and Okinawa Institute of Science and Technology Graduate University with subsidy funding from the Cabinet Office Government of Japan (Okinawa, Japan).
Nomenclature
- v
Velocity
- t
Time (s)
- P
Pressure (Pa)
- g
Gravitational acceleration
Interaction force between gas and solid phases
Identity matrix ()
Diffusion coefficient of granular energy
Specific heat (
- T
Temperature (
- H
Heat transfer between phases (
Reaction heat (
Thermal conductivity (
- Nu
Nusselt number ()
- Pr
Prandtl number ()
Solid radial distribution function ()
Restitution coefficient ()
Rate of strain tensor for fluid phase
- Sj
Jet cross-section area (
- St
Total bed cross-section area (
- L
Static bed height (m)
- d
Particle diameter (m)
Drag coefficient ()
Second invariant of the deviatoric stress tensor ()
- Greek letters
Volume fraction ()
Density
Stress tensor
Granular temperature
rate of pseudo-thermal energy dissipation
Solid phase granular viscosity
Angle of internal friction
Collisional dissipation of energy (kg
Solid bulk viscosity (kg
- Subscripts
- g
Gas phase
- s
Solid phase
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Articles in the same Issue
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- A Facile Approach to Develop Rice Husk Derived Green Catalyst for One-pot Synthesis of Glycerol Carbonate from Glycerol
- Experimental and Computational Studies of Aerated Stirred Tank with Dual Impeller
- Modified SRK Equation of State for Modeling Asphaltene Precipitation
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- Full-Scale CFD Modeling of Multiphase Flow Distribution in a Packed-bed Absorber with Structured Packing Mellapak 250Y
- Adsorption/desorption, Kinetics and Equilibrium Studies for the Uptake of Cu(II) and Zn(II) onto Banana Peel
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