476542 Solids mixing in bubbling fluidized beds: CFD-based analysis of BubbleDynamics and Time Scales
Solids mixing is investigated using fine-grid 3D CFD simulations. The fluidization of two distinct Geldart B particles (0.5 mm glass and 1.15 mm LLDPE) is simulated in an intermediate size 50 cm diameter fluidized bed since hydrodynamics at this scale are wall-independent and, therefore, scalable . Detailed diagnostics of the computed flowfield data are performed using MS3DATA , a tool that we developed to detect and track bubbles in 3D, and the solids axial and lateral motion are correlated with bubble rise. Subsequently, the mixing time-scales in the fluidized bed are estimated using the spatial and size distribution of bubbles. This is one of the first studies investigating solids mixing using 3D simulations an intermediate size bubbling fluidized bed. It provides valuable insights for estimating mixing time scales in larger beds, as well as for the reactor network modeling of bubbling fluidized beds (e.g. ). All simulations are based on the Two-Fluid Model (TFM) framework and performed using MFiX.
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