ISSN Online: 2379-1748
ISBN Flash Drive: 978-1-56700-469-4
ISBN Online: 978-1-56700-470-0
Second Thermal and Fluids Engineering Conference
STUDY OF THE EFFECT OF WALL BOUNDARY CONDITIONS ON THE PREDICTIONS OF THE LIQUID-SOLID FLOWS IN FLUIDIZED BEDS
Abstract
In this study, CFD simulations of the liquid-solid two-phase flow in a LSCFB down-comer were carried to study
the influence of restitution coefficient and specularity coefficient on the numerical results. The numerical results
were compared with the experimental data. Thus, the correct values for these parameters can be used in order to
increase the accuracy of the numerical prediction. It has been found that the specularity coefficient has a strong
impact on the solid particle distribution near the wall. When this coefficient is high, the core-annulus structure is
not even observed in certain zones. The restitution coefficient e=0.99 gives most accurate results. Overall, the
solids volume fraction is more sensitive to the specularity coefficient than the restitution coefficient.