Eventos Anais de eventos
ENCIT 2016
16th Brazilian Congress of Thermal Sciences and Engineering
CFD-DEM SIMULATION OF A BUBBLING FLUIDIZED BED
Submission Author:
Lucilla Coelho de Almeida , SC
Co-Authors:
Joao Americo Aguirre Oliveira Jr, Su Jian
Presenter: Lucilla Coelho de Almeida
doi://10.26678/ABCM.ENCIT2016.CIT2016-0106
Abstract
Several conceptual designs of the fluidized-bed nuclear reactor have been proposed due to advantages over conventional nuclear reactors, amongst which the enhanced heat transfer and mixing, reduced risk of hot-spot, higher burn-up of the fuel and increased safety. Accurate modeling of the particles and the coolant behavior is required to reliably evaluate the thermo-hydraulic efficiency and margin of safety of these reactors. The two-way coupling between solid and fluid can account for high-fidelity solid-solid interaction and reasonable accuracy in fluid calculation and fluid-solid interaction. In this work, particles are modeled as a discrete phase following the DEM approach, while the fluid is treated as a continuous phase, described by the volume averaged Navier-Stokes equations. The numerical approach was applied to the simulation of a bubbling fluidized bed and the pressure drop results were compared to experimental data, showing good agreement. The evaluation of the bed dynamics showed that the model was able to reproduce the expected behavior of a bubbling fluidized bed formed by Geldart D particles and confirmed the particle temperature uniformity within the bed.
Keywords
CFD-DEM, fluidized bed, nuclear reactors
