Validation of filtered two-fluid models for gas–particle flows against experimental data from bubbling fluidized bed

摘要: Abstract Predictions of simulations based on filtered Two-Fluid Models (TFMs) with constitutive relations for fluid–particle drag coefficient and stresses proposed by Igci Sundaresan [Ind. Eng. Chem. Res. 50 (2011) 13190–13201] Milioli et al. [AIChE J. 59 (2013) 3265–3275] were compared against experimental data from a bubbling fluidized bed challenge problem put forward the National Energy Technology Laboratory Particulate Solids Research Inc. It is found that most important correction to models modification drag, play secondary role at best. As expected, coarse grid using kinetic-theory TFM over-predicted gas–particle force, yielding unphysical expansion. The model classifies inhomogeneity in sub-filter scale flow structures filter size particle volume fraction as markers also predicted Refined slip velocity an additional marker led good agreement expansion time-averaged gas pressure gradient. was observed inadequate resolution region between distributor adjacent cylindrical wall test unit could lead spurious asymmetric predictions. With inclusion adequate inflation layer elements region, predictions became nearly symmetric little no effect However, it dramatically qualitatively altered details bed.