DRAG FORCE MODEL FOR DEM-CFD SIMULATION OF BINARY OR POLYDISPERSE BUBBLING FLUIDIZED BEDS

摘要

Consideration of solids polydispersion is still lacking in DEM-CFD simulations of fluidized beds. Theoretical formalism for the drag force in size-distributed particle systems was recently proposed, but only for low-Re flows. Extension of the same formalism to overcome such limitations is discussed. Fully-resolved flow through regularly arranged binary particle systems is computed to assess the formalism, observing consistency for low to moderate voidage value and some discrepancy for higher voidage values.