A numerical investigation of bubbling gas–solid fluidized bed dynamics in 2-D geometries

Profiles of solid fraction and heterogeneous phase structure in a gas–solid airlift loop reactor

“…Hence, the computational fluid dynamics (CFD) can offer a new approach to understand the complex phenomena of gas-solid flows. In recent years, many researchers (Cooper and Coronella, 2005;Pain et al, 2002;Witt et al, 1998;Zimmermann and Taghipour, 2005;Helland et al, 2002;Taghipour et al, 2005;Johansson et al, 2006;Peirano et al, 2001;van Wachem et al, 1999;Lu et al, 2007) have carried out the simulation studies on the hydrodynamics of gas-solid bubbling beds or turbulent beds by using standard EulerianEulerian two-fluid model (TFM). Brandani and Zhang (2006) have proposed a new model for predicting the behavior of fluidized beds based on the standard Eulerian-Eulerian TFM approach.…”

CFD modelling of the fast pyrolysis of biomass in fluidised bed reactors: Modelling the impact of biomass shrinkage

“…The hydrodynamics of fluidised beds have been widely investigated, both experimentally and numerically, to allow validation of the model results. To date most of the computational research interest has been focused on the simulation of the fluidised bed hydrodynamics, using either the Eulerian (continuum) [6] or the Lagrangian (discrete element) model [7,8], and models like the one developed by Bokkers et al [9] which is based on the modelling of the larger bubbles as discrete elements that are tracked individually during their rise through the emulsion phase, which is considered as a continuum. Due to the significant increase in computing power of recent years, these models have now made computational modelling of multiphase granular flows possible, though it is still very challenging, particularly so for industrial scale reactor units.…”

Control volume finite element modelling of segregation of sand and granular flows in fluidized beds

“…Although similar equation sets have been used previously by the authors to simulate monodisperse fluidized bed systems (Pain et al, 2002;Gomes et al, 2007) we here present additional terms which allow for multiple solid particle size distribution classes. The flow is modelled using an EulerianEulerian incompressible multiphase approach.…”